Viewing file:  test_coroutines.py (62.98 KB) -rw-r--r--
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import contextlib
import copy
import inspect
import pickle
import sys
import types
import unittest
import warnings
from test import support
from test.support import import_helper
from test.support import warnings_helper
from test.support.script_helper import assert_python_ok
class AsyncYieldFrom:
def __init__(self, obj):
self.obj = obj
def __await__(self):
yield from self.obj
class AsyncYield:
def __init__(self, value):
self.value = value
def __await__(self):
yield self.value
def run_async(coro):
assert coro.__class__ in {types.GeneratorType, types.CoroutineType}
buffer = []
result = None
while True:
try:
buffer.append(coro.send(None))
except StopIteration as ex:
result = ex.args[0] if ex.args else None
break
return buffer, result
def run_async__await__(coro):
assert coro.__class__ is types.CoroutineType
aw = coro.__await__()
buffer = []
result = None
i = 0
while True:
try:
if i % 2:
buffer.append(next(aw))
else:
buffer.append(aw.send(None))
i += 1
except StopIteration as ex:
result = ex.args[0] if ex.args else None
break
return buffer, result
@contextlib.contextmanager
def silence_coro_gc():
with warnings.catch_warnings():
warnings.simplefilter("ignore")
yield
support.gc_collect()
class AsyncBadSyntaxTest(unittest.TestCase):
def test_badsyntax_1(self):
samples = [
"""def foo():
await something()
""",
"""await something()""",
"""async def foo():
yield from []
""",
"""async def foo():
await await fut
""",
"""async def foo(a=await something()):
pass
""",
"""async def foo(a:await something()):
pass
""",
"""async def foo():
def bar():
[i async for i in els]
""",
"""async def foo():
def bar():
[await i for i in els]
""",
"""async def foo():
def bar():
[i for i in els
async for b in els]
""",
"""async def foo():
def bar():
[i for i in els
for c in b
async for b in els]
""",
"""async def foo():
def bar():
[i for i in els
async for b in els
for c in b]
""",
"""async def foo():
def bar():
[i for i in els
for b in await els]
""",
"""async def foo():
def bar():
[i for i in els
for b in els
if await b]
""",
"""async def foo():
def bar():
[i for i in await els]
""",
"""async def foo():
def bar():
[i for i in els if await i]
""",
"""def bar():
[i async for i in els]
""",
"""def bar():
{i: i async for i in els}
""",
"""def bar():
{i async for i in els}
""",
"""def bar():
[await i for i in els]
""",
"""def bar():
[i for i in els
async for b in els]
""",
"""def bar():
[i for i in els
for c in b
async for b in els]
""",
"""def bar():
[i for i in els
async for b in els
for c in b]
""",
"""def bar():
[i for i in els
for b in await els]
""",
"""def bar():
[i for i in els
for b in els
if await b]
""",
"""def bar():
[i for i in await els]
""",
"""def bar():
[i for i in els if await i]
""",
"""async def foo():
await
""",
"""async def foo():
def bar(): pass
await = 1
""",
"""async def foo():
def bar(): pass
await = 1
""",
"""async def foo():
def bar(): pass
if 1:
await = 1
""",
"""def foo():
async def bar(): pass
if 1:
await a
""",
"""def foo():
async def bar(): pass
await a
""",
"""def foo():
def baz(): pass
async def bar(): pass
await a
""",
"""def foo():
def baz(): pass
# 456
async def bar(): pass
# 123
await a
""",
"""async def foo():
def baz(): pass
# 456
async def bar(): pass
# 123
await = 2
""",
"""def foo():
def baz(): pass
async def bar(): pass
await a
""",
"""async def foo():
def baz(): pass
async def bar(): pass
await = 2
""",
"""async def foo():
def async(): pass
""",
"""async def foo():
def await(): pass
""",
"""async def foo():
def bar():
await
""",
"""async def foo():
return lambda async: await
""",
"""async def foo():
return lambda a: await
""",
"""await a()""",
"""async def foo(a=await b):
pass
""",
"""async def foo(a:await b):
pass
""",
"""def baz():
async def foo(a=await b):
pass
""",
"""async def foo(async):
pass
""",
"""async def foo():
def bar():
def baz():
async = 1
""",
"""async def foo():
def bar():
def baz():
pass
async = 1
""",
"""def foo():
async def bar():
async def baz():
pass
def baz():
42
async = 1
""",
"""async def foo():
def bar():
def baz():
pass\nawait foo()
""",
"""def foo():
def bar():
async def baz():
pass\nawait foo()
""",
"""async def foo(await):
pass
""",
"""def foo():
async def bar(): pass
await a
""",
"""def foo():
async def bar():
pass\nawait a
""",
"""def foo():
async for i in arange(2):
pass
""",
"""def foo():
async with resource:
pass
""",
"""async with resource:
pass
""",
"""async for i in arange(2):
pass
""",
]
for code in samples:
with self.subTest(code=code), self.assertRaises(SyntaxError):
compile(code, "<test>", "exec")
def test_badsyntax_2(self):
samples = [
"""def foo():
await = 1
""",
"""class Bar:
def async(): pass
""",
"""class Bar:
async = 1
""",
"""class async:
pass
""",
"""class await:
pass
""",
"""import math as await""",
"""def async():
pass""",
"""def foo(*, await=1):
pass"""
"""async = 1""",
"""print(await=1)"""
]
for code in samples:
with self.subTest(code=code), self.assertRaises(SyntaxError):
compile(code, "<test>", "exec")
def test_badsyntax_3(self):
with self.assertRaises(SyntaxError):
compile("async = 1", "<test>", "exec")
def test_badsyntax_4(self):
samples = [
'''def foo(await):
async def foo(): pass
async def foo():
pass
return await + 1
''',
'''def foo(await):
async def foo(): pass
async def foo(): pass
return await + 1
''',
'''def foo(await):
async def foo(): pass
async def foo(): pass
return await + 1
''',
'''def foo(await):
"""spam"""
async def foo(): \
pass
# 123
async def foo(): pass
# 456
return await + 1
''',
'''def foo(await):
def foo(): pass
def foo(): pass
async def bar(): return await_
await_ = await
try:
bar().send(None)
except StopIteration as ex:
return ex.args[0] + 1
'''
]
for code in samples:
with self.subTest(code=code), self.assertRaises(SyntaxError):
compile(code, "<test>", "exec")
class TokenizerRegrTest(unittest.TestCase):
def test_oneline_defs(self):
buf = []
for i in range(500):
buf.append('def i{i}(): return {i}'.format(i=i))
buf = '\n'.join(buf)
# Test that 500 consequent, one-line defs is OK
ns = {}
exec(buf, ns, ns)
self.assertEqual(ns['i499'](), 499)
# Test that 500 consequent, one-line defs *and*
# one 'async def' following them is OK
buf += '\nasync def foo():\n return'
ns = {}
exec(buf, ns, ns)
self.assertEqual(ns['i499'](), 499)
self.assertTrue(inspect.iscoroutinefunction(ns['foo']))
class CoroutineTest(unittest.TestCase):
def test_gen_1(self):
def gen(): yield
self.assertFalse(hasattr(gen, '__await__'))
def test_func_1(self):
async def foo():
return 10
f = foo()
self.assertIsInstance(f, types.CoroutineType)
self.assertTrue(bool(foo.__code__.co_flags & inspect.CO_COROUTINE))
self.assertFalse(bool(foo.__code__.co_flags & inspect.CO_GENERATOR))
self.assertTrue(bool(f.cr_code.co_flags & inspect.CO_COROUTINE))
self.assertFalse(bool(f.cr_code.co_flags & inspect.CO_GENERATOR))
self.assertEqual(run_async(f), ([], 10))
self.assertEqual(run_async__await__(foo()), ([], 10))
def bar(): pass
self.assertFalse(bool(bar.__code__.co_flags & inspect.CO_COROUTINE))
def test_func_2(self):
async def foo():
raise StopIteration
with self.assertRaisesRegex(
RuntimeError, "coroutine raised StopIteration"):
run_async(foo())
def test_func_3(self):
async def foo():
raise StopIteration
coro = foo()
self.assertRegex(repr(coro), '^<coroutine object.* at 0x.*>$')
coro.close()
def test_func_4(self):
async def foo():
raise StopIteration
coro = foo()
check = lambda: self.assertRaisesRegex(
TypeError, "'coroutine' object is not iterable")
with check():
list(coro)
with check():
tuple(coro)
with check():
sum(coro)
with check():
iter(coro)
with check():
for i in coro:
pass
with check():
[i for i in coro]
coro.close()
def test_func_5(self):
@types.coroutine
def bar():
yield 1
async def foo():
await bar()
check = lambda: self.assertRaisesRegex(
TypeError, "'coroutine' object is not iterable")
coro = foo()
with check():
for el in coro:
pass
coro.close()
# the following should pass without an error
for el in bar():
self.assertEqual(el, 1)
self.assertEqual([el for el in bar()], [1])
self.assertEqual(tuple(bar()), (1,))
self.assertEqual(next(iter(bar())), 1)
def test_func_6(self):
@types.coroutine
def bar():
yield 1
yield 2
async def foo():
await bar()
f = foo()
self.assertEqual(f.send(None), 1)
self.assertEqual(f.send(None), 2)
with self.assertRaises(StopIteration):
f.send(None)
def test_func_7(self):
async def bar():
return 10
coro = bar()
def foo():
yield from coro
with self.assertRaisesRegex(
TypeError,
"cannot 'yield from' a coroutine object in "
"a non-coroutine generator"):
list(foo())
coro.close()
def test_func_8(self):
@types.coroutine
def bar():
return (yield from coro)
async def foo():
return 'spam'
coro = foo()
self.assertEqual(run_async(bar()), ([], 'spam'))
coro.close()
def test_func_9(self):
async def foo():
pass
with self.assertWarnsRegex(
RuntimeWarning,
r"coroutine '.*test_func_9.*foo' was never awaited"):
foo()
support.gc_collect()
with self.assertWarnsRegex(
RuntimeWarning,
r"coroutine '.*test_func_9.*foo' was never awaited"):
with self.assertRaises(TypeError):
# See bpo-32703.
for _ in foo():
pass
support.gc_collect()
def test_func_10(self):
N = 0
@types.coroutine
def gen():
nonlocal N
try:
a = yield
yield (a ** 2)
except ZeroDivisionError:
N += 100
raise
finally:
N += 1
async def foo():
await gen()
coro = foo()
aw = coro.__await__()
self.assertIs(aw, iter(aw))
next(aw)
self.assertEqual(aw.send(10), 100)
self.assertEqual(N, 0)
aw.close()
self.assertEqual(N, 1)
coro = foo()
aw = coro.__await__()
next(aw)
with self.assertRaises(ZeroDivisionError):
aw.throw(ZeroDivisionError, None, None)
self.assertEqual(N, 102)
def test_func_11(self):
async def func(): pass
coro = func()
# Test that PyCoro_Type and _PyCoroWrapper_Type types were properly
# initialized
self.assertIn('__await__', dir(coro))
self.assertIn('__iter__', dir(coro.__await__()))
self.assertIn('coroutine_wrapper', repr(coro.__await__()))
coro.close() # avoid RuntimeWarning
def test_func_12(self):
async def g():
i = me.send(None)
await foo
me = g()
with self.assertRaisesRegex(ValueError,
"coroutine already executing"):
me.send(None)
def test_func_13(self):
async def g():
pass
coro = g()
with self.assertRaisesRegex(
TypeError,
"can't send non-None value to a just-started coroutine"):
coro.send('spam')
coro.close()
def test_func_14(self):
@types.coroutine
def gen():
yield
async def coro():
try:
await gen()
except GeneratorExit:
await gen()
c = coro()
c.send(None)
with self.assertRaisesRegex(RuntimeError,
"coroutine ignored GeneratorExit"):
c.close()
def test_func_15(self):
# See http://bugs.python.org/issue25887 for details
async def spammer():
return 'spam'
async def reader(coro):
return await coro
spammer_coro = spammer()
with self.assertRaisesRegex(StopIteration, 'spam'):
reader(spammer_coro).send(None)
with self.assertRaisesRegex(RuntimeError,
'cannot reuse already awaited coroutine'):
reader(spammer_coro).send(None)
def test_func_16(self):
# See http://bugs.python.org/issue25887 for details
@types.coroutine
def nop():
yield
async def send():
await nop()
return 'spam'
async def read(coro):
await nop()
return await coro
spammer = send()
reader = read(spammer)
reader.send(None)
reader.send(None)
with self.assertRaisesRegex(Exception, 'ham'):
reader.throw(Exception('ham'))
reader = read(spammer)
reader.send(None)
with self.assertRaisesRegex(RuntimeError,
'cannot reuse already awaited coroutine'):
reader.send(None)
with self.assertRaisesRegex(RuntimeError,
'cannot reuse already awaited coroutine'):
reader.throw(Exception('wat'))
def test_func_17(self):
# See http://bugs.python.org/issue25887 for details
async def coroutine():
return 'spam'
coro = coroutine()
with self.assertRaisesRegex(StopIteration, 'spam'):
coro.send(None)
with self.assertRaisesRegex(RuntimeError,
'cannot reuse already awaited coroutine'):
coro.send(None)
with self.assertRaisesRegex(RuntimeError,
'cannot reuse already awaited coroutine'):
coro.throw(Exception('wat'))
# Closing a coroutine shouldn't raise any exception even if it's
# already closed/exhausted (similar to generators)
coro.close()
coro.close()
def test_func_18(self):
# See http://bugs.python.org/issue25887 for details
async def coroutine():
return 'spam'
coro = coroutine()
await_iter = coro.__await__()
it = iter(await_iter)
with self.assertRaisesRegex(StopIteration, 'spam'):
it.send(None)
with self.assertRaisesRegex(RuntimeError,
'cannot reuse already awaited coroutine'):
it.send(None)
with self.assertRaisesRegex(RuntimeError,
'cannot reuse already awaited coroutine'):
# Although the iterator protocol requires iterators to
# raise another StopIteration here, we don't want to do
# that. In this particular case, the iterator will raise
# a RuntimeError, so that 'yield from' and 'await'
# expressions will trigger the error, instead of silently
# ignoring the call.
next(it)
with self.assertRaisesRegex(RuntimeError,
'cannot reuse already awaited coroutine'):
it.throw(Exception('wat'))
with self.assertRaisesRegex(RuntimeError,
'cannot reuse already awaited coroutine'):
it.throw(Exception('wat'))
# Closing a coroutine shouldn't raise any exception even if it's
# already closed/exhausted (similar to generators)
it.close()
it.close()
def test_func_19(self):
CHK = 0
@types.coroutine
def foo():
nonlocal CHK
yield
try:
yield
except GeneratorExit:
CHK += 1
async def coroutine():
await foo()
coro = coroutine()
coro.send(None)
coro.send(None)
self.assertEqual(CHK, 0)
coro.close()
self.assertEqual(CHK, 1)
for _ in range(3):
# Closing a coroutine shouldn't raise any exception even if it's
# already closed/exhausted (similar to generators)
coro.close()
self.assertEqual(CHK, 1)
def test_coro_wrapper_send_tuple(self):
async def foo():
return (10,)
result = run_async__await__(foo())
self.assertEqual(result, ([], (10,)))
def test_coro_wrapper_send_stop_iterator(self):
async def foo():
return StopIteration(10)
result = run_async__await__(foo())
self.assertIsInstance(result[1], StopIteration)
self.assertEqual(result[1].value, 10)
def test_cr_await(self):
@types.coroutine
def a():
self.assertEqual(inspect.getcoroutinestate(coro_b), inspect.CORO_RUNNING)
self.assertIsNone(coro_b.cr_await)
yield
self.assertEqual(inspect.getcoroutinestate(coro_b), inspect.CORO_RUNNING)
self.assertIsNone(coro_b.cr_await)
async def c():
await a()
async def b():
self.assertIsNone(coro_b.cr_await)
await c()
self.assertIsNone(coro_b.cr_await)
coro_b = b()
self.assertEqual(inspect.getcoroutinestate(coro_b), inspect.CORO_CREATED)
self.assertIsNone(coro_b.cr_await)
coro_b.send(None)
self.assertEqual(inspect.getcoroutinestate(coro_b), inspect.CORO_SUSPENDED)
self.assertEqual(coro_b.cr_await.cr_await.gi_code.co_name, 'a')
with self.assertRaises(StopIteration):
coro_b.send(None) # complete coroutine
self.assertEqual(inspect.getcoroutinestate(coro_b), inspect.CORO_CLOSED)
self.assertIsNone(coro_b.cr_await)
def test_corotype_1(self):
ct = types.CoroutineType
self.assertIn('into coroutine', ct.send.__doc__)
self.assertIn('inside coroutine', ct.close.__doc__)
self.assertIn('in coroutine', ct.throw.__doc__)
self.assertIn('of the coroutine', ct.__dict__['__name__'].__doc__)
self.assertIn('of the coroutine', ct.__dict__['__qualname__'].__doc__)
self.assertEqual(ct.__name__, 'coroutine')
async def f(): pass
c = f()
self.assertIn('coroutine object', repr(c))
c.close()
def test_await_1(self):
async def foo():
await 1
with self.assertRaisesRegex(TypeError, "object int can.t.*await"):
run_async(foo())
def test_await_2(self):
async def foo():
await []
with self.assertRaisesRegex(TypeError, "object list can.t.*await"):
run_async(foo())
def test_await_3(self):
async def foo():
await AsyncYieldFrom([1, 2, 3])
self.assertEqual(run_async(foo()), ([1, 2, 3], None))
self.assertEqual(run_async__await__(foo()), ([1, 2, 3], None))
def test_await_4(self):
async def bar():
return 42
async def foo():
return await bar()
self.assertEqual(run_async(foo()), ([], 42))
def test_await_5(self):
class Awaitable:
def __await__(self):
return
async def foo():
return (await Awaitable())
with self.assertRaisesRegex(
TypeError, "__await__.*returned non-iterator of type"):
run_async(foo())
def test_await_6(self):
class Awaitable:
def __await__(self):
return iter([52])
async def foo():
return (await Awaitable())
self.assertEqual(run_async(foo()), ([52], None))
def test_await_7(self):
class Awaitable:
def __await__(self):
yield 42
return 100
async def foo():
return (await Awaitable())
self.assertEqual(run_async(foo()), ([42], 100))
def test_await_8(self):
class Awaitable:
pass
async def foo(): return await Awaitable()
with self.assertRaisesRegex(
TypeError, "object Awaitable can't be used in 'await' expression"):
run_async(foo())
def test_await_9(self):
def wrap():
return bar
async def bar():
return 42
async def foo():
db = {'b': lambda: wrap}
class DB:
b = wrap
return (await bar() + await wrap()() + await db['b']()()() +
await bar() * 1000 + await DB.b()())
async def foo2():
return -await bar()
self.assertEqual(run_async(foo()), ([], 42168))
self.assertEqual(run_async(foo2()), ([], -42))
def test_await_10(self):
async def baz():
return 42
async def bar():
return baz()
async def foo():
return await (await bar())
self.assertEqual(run_async(foo()), ([], 42))
def test_await_11(self):
def ident(val):
return val
async def bar():
return 'spam'
async def foo():
return ident(val=await bar())
async def foo2():
return await bar(), 'ham'
self.assertEqual(run_async(foo2()), ([], ('spam', 'ham')))
def test_await_12(self):
async def coro():
return 'spam'
c = coro()
class Awaitable:
def __await__(self):
return c
async def foo():
return await Awaitable()
with self.assertRaisesRegex(
TypeError, r"__await__\(\) returned a coroutine"):
run_async(foo())
c.close()
def test_await_13(self):
class Awaitable:
def __await__(self):
return self
async def foo():
return await Awaitable()
with self.assertRaisesRegex(
TypeError, "__await__.*returned non-iterator of type"):
run_async(foo())
def test_await_14(self):
class Wrapper:
# Forces the interpreter to use CoroutineType.__await__
def __init__(self, coro):
assert coro.__class__ is types.CoroutineType
self.coro = coro
def __await__(self):
return self.coro.__await__()
class FutureLike:
def __await__(self):
return (yield)
class Marker(Exception):
pass
async def coro1():
try:
return await FutureLike()
except ZeroDivisionError:
raise Marker
async def coro2():
return await Wrapper(coro1())
c = coro2()
c.send(None)
with self.assertRaisesRegex(StopIteration, 'spam'):
c.send('spam')
c = coro2()
c.send(None)
with self.assertRaises(Marker):
c.throw(ZeroDivisionError)
def test_await_15(self):
@types.coroutine
def nop():
yield
async def coroutine():
await nop()
async def waiter(coro):
await coro
coro = coroutine()
coro.send(None)
with self.assertRaisesRegex(RuntimeError,
"coroutine is being awaited already"):
waiter(coro).send(None)
def test_await_16(self):
# See https://bugs.python.org/issue29600 for details.
async def f():
return ValueError()
async def g():
try:
raise KeyError
except:
return await f()
_, result = run_async(g())
self.assertIsNone(result.__context__)
def test_with_1(self):
class Manager:
def __init__(self, name):
self.name = name
async def __aenter__(self):
await AsyncYieldFrom(['enter-1-' + self.name,
'enter-2-' + self.name])
return self
async def __aexit__(self, *args):
await AsyncYieldFrom(['exit-1-' + self.name,
'exit-2-' + self.name])
if self.name == 'B':
return True
async def foo():
async with Manager("A") as a, Manager("B") as b:
await AsyncYieldFrom([('managers', a.name, b.name)])
1/0
f = foo()
result, _ = run_async(f)
self.assertEqual(
result, ['enter-1-A', 'enter-2-A', 'enter-1-B', 'enter-2-B',
('managers', 'A', 'B'),
'exit-1-B', 'exit-2-B', 'exit-1-A', 'exit-2-A']
)
async def foo():
async with Manager("A") as a, Manager("C") as c:
await AsyncYieldFrom([('managers', a.name, c.name)])
1/0
with self.assertRaises(ZeroDivisionError):
run_async(foo())
def test_with_2(self):
class CM:
def __aenter__(self):
pass
body_executed = None
async def foo():
nonlocal body_executed
body_executed = False
async with CM():
body_executed = True
with self.assertRaisesRegex(AttributeError, '__aexit__'):
run_async(foo())
self.assertIs(body_executed, False)
def test_with_3(self):
class CM:
def __aexit__(self):
pass
body_executed = None
async def foo():
nonlocal body_executed
body_executed = False
async with CM():
body_executed = True
with self.assertRaisesRegex(AttributeError, '__aenter__'):
run_async(foo())
self.assertIs(body_executed, False)
def test_with_4(self):
class CM:
pass
body_executed = None
async def foo():
nonlocal body_executed
body_executed = False
async with CM():
body_executed = True
with self.assertRaisesRegex(AttributeError, '__aenter__'):
run_async(foo())
self.assertIs(body_executed, False)
def test_with_5(self):
# While this test doesn't make a lot of sense,
# it's a regression test for an early bug with opcodes
# generation
class CM:
async def __aenter__(self):
return self
async def __aexit__(self, *exc):
pass
async def func():
async with CM():
assert (1, ) == 1
with self.assertRaises(AssertionError):
run_async(func())
def test_with_6(self):
class CM:
def __aenter__(self):
return 123
def __aexit__(self, *e):
return 456
async def foo():
async with CM():
pass
with self.assertRaisesRegex(
TypeError,
"'async with' received an object from __aenter__ "
"that does not implement __await__: int"):
# it's important that __aexit__ wasn't called
run_async(foo())
def test_with_7(self):
class CM:
async def __aenter__(self):
return self
def __aexit__(self, *e):
return 444
# Exit with exception
async def foo():
async with CM():
1/0
try:
run_async(foo())
except TypeError as exc:
self.assertRegex(
exc.args[0],
"'async with' received an object from __aexit__ "
"that does not implement __await__: int")
self.assertTrue(exc.__context__ is not None)
self.assertTrue(isinstance(exc.__context__, ZeroDivisionError))
else:
self.fail('invalid asynchronous context manager did not fail')
def test_with_8(self):
CNT = 0
class CM:
async def __aenter__(self):
return self
def __aexit__(self, *e):
return 456
# Normal exit
async def foo():
nonlocal CNT
async with CM():
CNT += 1
with self.assertRaisesRegex(
TypeError,
"'async with' received an object from __aexit__ "
"that does not implement __await__: int"):
run_async(foo())
self.assertEqual(CNT, 1)
# Exit with 'break'
async def foo():
nonlocal CNT
for i in range(2):
async with CM():
CNT += 1
break
with self.assertRaisesRegex(
TypeError,
"'async with' received an object from __aexit__ "
"that does not implement __await__: int"):
run_async(foo())
self.assertEqual(CNT, 2)
# Exit with 'continue'
async def foo():
nonlocal CNT
for i in range(2):
async with CM():
CNT += 1
continue
with self.assertRaisesRegex(
TypeError,
"'async with' received an object from __aexit__ "
"that does not implement __await__: int"):
run_async(foo())
self.assertEqual(CNT, 3)
# Exit with 'return'
async def foo():
nonlocal CNT
async with CM():
CNT += 1
return
with self.assertRaisesRegex(
TypeError,
"'async with' received an object from __aexit__ "
"that does not implement __await__: int"):
run_async(foo())
self.assertEqual(CNT, 4)
def test_with_9(self):
CNT = 0
class CM:
async def __aenter__(self):
return self
async def __aexit__(self, *e):
1/0
async def foo():
nonlocal CNT
async with CM():
CNT += 1
with self.assertRaises(ZeroDivisionError):
run_async(foo())
self.assertEqual(CNT, 1)
def test_with_10(self):
CNT = 0
class CM:
async def __aenter__(self):
return self
async def __aexit__(self, *e):
1/0
async def foo():
nonlocal CNT
async with CM():
async with CM():
raise RuntimeError
try:
run_async(foo())
except ZeroDivisionError as exc:
self.assertTrue(exc.__context__ is not None)
self.assertTrue(isinstance(exc.__context__, ZeroDivisionError))
self.assertTrue(isinstance(exc.__context__.__context__,
RuntimeError))
else:
self.fail('exception from __aexit__ did not propagate')
def test_with_11(self):
CNT = 0
class CM:
async def __aenter__(self):
raise NotImplementedError
async def __aexit__(self, *e):
1/0
async def foo():
nonlocal CNT
async with CM():
raise RuntimeError
try:
run_async(foo())
except NotImplementedError as exc:
self.assertTrue(exc.__context__ is None)
else:
self.fail('exception from __aenter__ did not propagate')
def test_with_12(self):
CNT = 0
class CM:
async def __aenter__(self):
return self
async def __aexit__(self, *e):
return True
async def foo():
nonlocal CNT
async with CM() as cm:
self.assertIs(cm.__class__, CM)
raise RuntimeError
run_async(foo())
def test_with_13(self):
CNT = 0
class CM:
async def __aenter__(self):
1/0
async def __aexit__(self, *e):
return True
async def foo():
nonlocal CNT
CNT += 1
async with CM():
CNT += 1000
CNT += 10000
with self.assertRaises(ZeroDivisionError):
run_async(foo())
self.assertEqual(CNT, 1)
def test_for_1(self):
aiter_calls = 0
class AsyncIter:
def __init__(self):
self.i = 0
def __aiter__(self):
nonlocal aiter_calls
aiter_calls += 1
return self
async def __anext__(self):
self.i += 1
if not (self.i % 10):
await AsyncYield(self.i * 10)
if self.i > 100:
raise StopAsyncIteration
return self.i, self.i
buffer = []
async def test1():
async for i1, i2 in AsyncIter():
buffer.append(i1 + i2)
yielded, _ = run_async(test1())
# Make sure that __aiter__ was called only once
self.assertEqual(aiter_calls, 1)
self.assertEqual(yielded, [i * 100 for i in range(1, 11)])
self.assertEqual(buffer, [i*2 for i in range(1, 101)])
buffer = []
async def test2():
nonlocal buffer
async for i in AsyncIter():
buffer.append(i[0])
if i[0] == 20:
break
else:
buffer.append('what?')
buffer.append('end')
yielded, _ = run_async(test2())
# Make sure that __aiter__ was called only once
self.assertEqual(aiter_calls, 2)
self.assertEqual(yielded, [100, 200])
self.assertEqual(buffer, [i for i in range(1, 21)] + ['end'])
buffer = []
async def test3():
nonlocal buffer
async for i in AsyncIter():
if i[0] > 20:
continue
buffer.append(i[0])
else:
buffer.append('what?')
buffer.append('end')
yielded, _ = run_async(test3())
# Make sure that __aiter__ was called only once
self.assertEqual(aiter_calls, 3)
self.assertEqual(yielded, [i * 100 for i in range(1, 11)])
self.assertEqual(buffer, [i for i in range(1, 21)] +
['what?', 'end'])
def test_for_2(self):
tup = (1, 2, 3)
refs_before = sys.getrefcount(tup)
async def foo():
async for i in tup:
print('never going to happen')
with self.assertRaisesRegex(
TypeError, "async for' requires an object.*__aiter__.*tuple"):
run_async(foo())
self.assertEqual(sys.getrefcount(tup), refs_before)
def test_for_3(self):
class I:
def __aiter__(self):
return self
aiter = I()
refs_before = sys.getrefcount(aiter)
async def foo():
async for i in aiter:
print('never going to happen')
with self.assertRaisesRegex(
TypeError,
r"that does not implement __anext__"):
run_async(foo())
self.assertEqual(sys.getrefcount(aiter), refs_before)
def test_for_4(self):
class I:
def __aiter__(self):
return self
def __anext__(self):
return ()
aiter = I()
refs_before = sys.getrefcount(aiter)
async def foo():
async for i in aiter:
print('never going to happen')
with self.assertRaisesRegex(
TypeError,
"async for' received an invalid object.*__anext__.*tuple"):
run_async(foo())
self.assertEqual(sys.getrefcount(aiter), refs_before)
def test_for_6(self):
I = 0
class Manager:
async def __aenter__(self):
nonlocal I
I += 10000
async def __aexit__(self, *args):
nonlocal I
I += 100000
class Iterable:
def __init__(self):
self.i = 0
def __aiter__(self):
return self
async def __anext__(self):
if self.i > 10:
raise StopAsyncIteration
self.i += 1
return self.i
##############
manager = Manager()
iterable = Iterable()
mrefs_before = sys.getrefcount(manager)
irefs_before = sys.getrefcount(iterable)
async def main():
nonlocal I
async with manager:
async for i in iterable:
I += 1
I += 1000
with warnings.catch_warnings():
warnings.simplefilter("error")
# Test that __aiter__ that returns an asynchronous iterator
# directly does not throw any warnings.
run_async(main())
self.assertEqual(I, 111011)
self.assertEqual(sys.getrefcount(manager), mrefs_before)
self.assertEqual(sys.getrefcount(iterable), irefs_before)
##############
async def main():
nonlocal I
async with Manager():
async for i in Iterable():
I += 1
I += 1000
async with Manager():
async for i in Iterable():
I += 1
I += 1000
run_async(main())
self.assertEqual(I, 333033)
##############
async def main():
nonlocal I
async with Manager():
I += 100
async for i in Iterable():
I += 1
else:
I += 10000000
I += 1000
async with Manager():
I += 100
async for i in Iterable():
I += 1
else:
I += 10000000
I += 1000
run_async(main())
self.assertEqual(I, 20555255)
def test_for_7(self):
CNT = 0
class AI:
def __aiter__(self):
1/0
async def foo():
nonlocal CNT
async for i in AI():
CNT += 1
CNT += 10
with self.assertRaises(ZeroDivisionError):
run_async(foo())
self.assertEqual(CNT, 0)
def test_for_8(self):
CNT = 0
class AI:
def __aiter__(self):
1/0
async def foo():
nonlocal CNT
async for i in AI():
CNT += 1
CNT += 10
with self.assertRaises(ZeroDivisionError):
with warnings.catch_warnings():
warnings.simplefilter("error")
# Test that if __aiter__ raises an exception it propagates
# without any kind of warning.
run_async(foo())
self.assertEqual(CNT, 0)
def test_for_11(self):
class F:
def __aiter__(self):
return self
def __anext__(self):
return self
def __await__(self):
1 / 0
async def main():
async for _ in F():
pass
with self.assertRaisesRegex(TypeError,
'an invalid object from __anext__') as c:
main().send(None)
err = c.exception
self.assertIsInstance(err.__cause__, ZeroDivisionError)
def test_for_tuple(self):
class Done(Exception): pass
class AIter(tuple):
i = 0
def __aiter__(self):
return self
async def __anext__(self):
if self.i >= len(self):
raise StopAsyncIteration
self.i += 1
return self[self.i - 1]
result = []
async def foo():
async for i in AIter([42]):
result.append(i)
raise Done
with self.assertRaises(Done):
foo().send(None)
self.assertEqual(result, [42])
def test_for_stop_iteration(self):
class Done(Exception): pass
class AIter(StopIteration):
i = 0
def __aiter__(self):
return self
async def __anext__(self):
if self.i:
raise StopAsyncIteration
self.i += 1
return self.value
result = []
async def foo():
async for i in AIter(42):
result.append(i)
raise Done
with self.assertRaises(Done):
foo().send(None)
self.assertEqual(result, [42])
def test_comp_1(self):
async def f(i):
return i
async def run_list():
return [await c for c in [f(1), f(41)]]
async def run_set():
return {await c for c in [f(1), f(41)]}
async def run_dict1():
return {await c: 'a' for c in [f(1), f(41)]}
async def run_dict2():
return {i: await c for i, c in enumerate([f(1), f(41)])}
self.assertEqual(run_async(run_list()), ([], [1, 41]))
self.assertEqual(run_async(run_set()), ([], {1, 41}))
self.assertEqual(run_async(run_dict1()), ([], {1: 'a', 41: 'a'}))
self.assertEqual(run_async(run_dict2()), ([], {0: 1, 1: 41}))
def test_comp_2(self):
async def f(i):
return i
async def run_list():
return [s for c in [f(''), f('abc'), f(''), f(['de', 'fg'])]
for s in await c]
self.assertEqual(
run_async(run_list()),
([], ['a', 'b', 'c', 'de', 'fg']))
async def run_set():
return {d
for c in [f([f([10, 30]),
f([20])])]
for s in await c
for d in await s}
self.assertEqual(
run_async(run_set()),
([], {10, 20, 30}))
async def run_set2():
return {await s
for c in [f([f(10), f(20)])]
for s in await c}
self.assertEqual(
run_async(run_set2()),
([], {10, 20}))
def test_comp_3(self):
async def f(it):
for i in it:
yield i
async def run_list():
return [i + 1 async for i in f([10, 20])]
self.assertEqual(
run_async(run_list()),
([], [11, 21]))
async def run_set():
return {i + 1 async for i in f([10, 20])}
self.assertEqual(
run_async(run_set()),
([], {11, 21}))
async def run_dict():
return {i + 1: i + 2 async for i in f([10, 20])}
self.assertEqual(
run_async(run_dict()),
([], {11: 12, 21: 22}))
async def run_gen():
gen = (i + 1 async for i in f([10, 20]))
return [g + 100 async for g in gen]
self.assertEqual(
run_async(run_gen()),
([], [111, 121]))
def test_comp_4(self):
async def f(it):
for i in it:
yield i
async def run_list():
return [i + 1 async for i in f([10, 20]) if i > 10]
self.assertEqual(
run_async(run_list()),
([], [21]))
async def run_set():
return {i + 1 async for i in f([10, 20]) if i > 10}
self.assertEqual(
run_async(run_set()),
([], {21}))
async def run_dict():
return {i + 1: i + 2 async for i in f([10, 20]) if i > 10}
self.assertEqual(
run_async(run_dict()),
([], {21: 22}))
async def run_gen():
gen = (i + 1 async for i in f([10, 20]) if i > 10)
return [g + 100 async for g in gen]
self.assertEqual(
run_async(run_gen()),
([], [121]))
def test_comp_4_2(self):
async def f(it):
for i in it:
yield i
async def run_list():
return [i + 10 async for i in f(range(5)) if 0 < i < 4]
self.assertEqual(
run_async(run_list()),
([], [11, 12, 13]))
async def run_set():
return {i + 10 async for i in f(range(5)) if 0 < i < 4}
self.assertEqual(
run_async(run_set()),
([], {11, 12, 13}))
async def run_dict():
return {i + 10: i + 100 async for i in f(range(5)) if 0 < i < 4}
self.assertEqual(
run_async(run_dict()),
([], {11: 101, 12: 102, 13: 103}))
async def run_gen():
gen = (i + 10 async for i in f(range(5)) if 0 < i < 4)
return [g + 100 async for g in gen]
self.assertEqual(
run_async(run_gen()),
([], [111, 112, 113]))
def test_comp_5(self):
async def f(it):
for i in it:
yield i
async def run_list():
return [i + 1 for pair in ([10, 20], [30, 40]) if pair[0] > 10
async for i in f(pair) if i > 30]
self.assertEqual(
run_async(run_list()),
([], [41]))
def test_comp_6(self):
async def f(it):
for i in it:
yield i
async def run_list():
return [i + 1 async for seq in f([(10, 20), (30,)])
for i in seq]
self.assertEqual(
run_async(run_list()),
([], [11, 21, 31]))
def test_comp_7(self):
async def f():
yield 1
yield 2
raise Exception('aaa')
async def run_list():
return [i async for i in f()]
with self.assertRaisesRegex(Exception, 'aaa'):
run_async(run_list())
def test_comp_8(self):
async def f():
return [i for i in [1, 2, 3]]
self.assertEqual(
run_async(f()),
([], [1, 2, 3]))
def test_comp_9(self):
async def gen():
yield 1
yield 2
async def f():
l = [i async for i in gen()]
return [i for i in l]
self.assertEqual(
run_async(f()),
([], [1, 2]))
def test_comp_10(self):
async def f():
xx = {i for i in [1, 2, 3]}
return {x: x for x in xx}
self.assertEqual(
run_async(f()),
([], {1: 1, 2: 2, 3: 3}))
def test_copy(self):
async def func(): pass
coro = func()
with self.assertRaises(TypeError):
copy.copy(coro)
aw = coro.__await__()
try:
with self.assertRaises(TypeError):
copy.copy(aw)
finally:
aw.close()
def test_pickle(self):
async def func(): pass
coro = func()
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
with self.assertRaises((TypeError, pickle.PicklingError)):
pickle.dumps(coro, proto)
aw = coro.__await__()
try:
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
with self.assertRaises((TypeError, pickle.PicklingError)):
pickle.dumps(aw, proto)
finally:
aw.close()
def test_fatal_coro_warning(self):
# Issue 27811
async def func(): pass
with warnings.catch_warnings(), \
support.catch_unraisable_exception() as cm:
warnings.filterwarnings("error")
coro = func()
# only store repr() to avoid keeping the coroutine alive
coro_repr = repr(coro)
coro = None
support.gc_collect()
self.assertIn("was never awaited", str(cm.unraisable.exc_value))
self.assertEqual(repr(cm.unraisable.object), coro_repr)
def test_for_assign_raising_stop_async_iteration(self):
class BadTarget:
def __setitem__(self, key, value):
raise StopAsyncIteration(42)
tgt = BadTarget()
async def source():
yield 10
async def run_for():
with self.assertRaises(StopAsyncIteration) as cm:
async for tgt[0] in source():
pass
self.assertEqual(cm.exception.args, (42,))
return 'end'
self.assertEqual(run_async(run_for()), ([], 'end'))
async def run_list():
with self.assertRaises(StopAsyncIteration) as cm:
return [0 async for tgt[0] in source()]
self.assertEqual(cm.exception.args, (42,))
return 'end'
self.assertEqual(run_async(run_list()), ([], 'end'))
async def run_gen():
gen = (0 async for tgt[0] in source())
a = gen.asend(None)
with self.assertRaises(RuntimeError) as cm:
await a
self.assertIsInstance(cm.exception.__cause__, StopAsyncIteration)
self.assertEqual(cm.exception.__cause__.args, (42,))
return 'end'
self.assertEqual(run_async(run_gen()), ([], 'end'))
def test_for_assign_raising_stop_async_iteration_2(self):
class BadIterable:
def __iter__(self):
raise StopAsyncIteration(42)
async def badpairs():
yield BadIterable()
async def run_for():
with self.assertRaises(StopAsyncIteration) as cm:
async for i, j in badpairs():
pass
self.assertEqual(cm.exception.args, (42,))
return 'end'
self.assertEqual(run_async(run_for()), ([], 'end'))
async def run_list():
with self.assertRaises(StopAsyncIteration) as cm:
return [0 async for i, j in badpairs()]
self.assertEqual(cm.exception.args, (42,))
return 'end'
self.assertEqual(run_async(run_list()), ([], 'end'))
async def run_gen():
gen = (0 async for i, j in badpairs())
a = gen.asend(None)
with self.assertRaises(RuntimeError) as cm:
await a
self.assertIsInstance(cm.exception.__cause__, StopAsyncIteration)
self.assertEqual(cm.exception.__cause__.args, (42,))
return 'end'
self.assertEqual(run_async(run_gen()), ([], 'end'))
class CoroAsyncIOCompatTest(unittest.TestCase):
def test_asyncio_1(self):
# asyncio cannot be imported when Python is compiled without thread
# support
asyncio = import_helper.import_module('asyncio')
class MyException(Exception):
pass
buffer = []
class CM:
async def __aenter__(self):
buffer.append(1)
await asyncio.sleep(0.01)
buffer.append(2)
return self
async def __aexit__(self, exc_type, exc_val, exc_tb):
await asyncio.sleep(0.01)
buffer.append(exc_type.__name__)
async def f():
async with CM() as c:
await asyncio.sleep(0.01)
raise MyException
buffer.append('unreachable')
loop = asyncio.new_event_loop()
asyncio.set_event_loop(loop)
try:
loop.run_until_complete(f())
except MyException:
pass
finally:
loop.close()
asyncio.set_event_loop_policy(None)
self.assertEqual(buffer, [1, 2, 'MyException'])
class OriginTrackingTest(unittest.TestCase):
def here(self):
info = inspect.getframeinfo(inspect.currentframe().f_back)
return (info.filename, info.lineno)
def test_origin_tracking(self):
orig_depth = sys.get_coroutine_origin_tracking_depth()
try:
async def corofn():
pass
sys.set_coroutine_origin_tracking_depth(0)
self.assertEqual(sys.get_coroutine_origin_tracking_depth(), 0)
with contextlib.closing(corofn()) as coro:
self.assertIsNone(coro.cr_origin)
sys.set_coroutine_origin_tracking_depth(1)
self.assertEqual(sys.get_coroutine_origin_tracking_depth(), 1)
fname, lineno = self.here()
with contextlib.closing(corofn()) as coro:
self.assertEqual(coro.cr_origin,
((fname, lineno + 1, "test_origin_tracking"),))
sys.set_coroutine_origin_tracking_depth(2)
self.assertEqual(sys.get_coroutine_origin_tracking_depth(), 2)
def nested():
return (self.here(), corofn())
fname, lineno = self.here()
((nested_fname, nested_lineno), coro) = nested()
with contextlib.closing(coro):
self.assertEqual(coro.cr_origin,
((nested_fname, nested_lineno, "nested"),
(fname, lineno + 1, "test_origin_tracking")))
# Check we handle running out of frames correctly
sys.set_coroutine_origin_tracking_depth(1000)
with contextlib.closing(corofn()) as coro:
self.assertTrue(2 < len(coro.cr_origin) < 1000)
# We can't set depth negative
with self.assertRaises(ValueError):
sys.set_coroutine_origin_tracking_depth(-1)
# And trying leaves it unchanged
self.assertEqual(sys.get_coroutine_origin_tracking_depth(), 1000)
finally:
sys.set_coroutine_origin_tracking_depth(orig_depth)
def test_origin_tracking_warning(self):
async def corofn():
pass
a1_filename, a1_lineno = self.here()
def a1():
return corofn() # comment in a1
a1_lineno += 2
a2_filename, a2_lineno = self.here()
def a2():
return a1() # comment in a2
a2_lineno += 2
def check(depth, msg):
sys.set_coroutine_origin_tracking_depth(depth)
with self.assertWarns(RuntimeWarning) as cm:
a2()
support.gc_collect()
self.assertEqual(msg, str(cm.warning))
orig_depth = sys.get_coroutine_origin_tracking_depth()
try:
msg = check(0, f"coroutine '{corofn.__qualname__}' was never awaited")
check(1, "".join([
f"coroutine '{corofn.__qualname__}' was never awaited\n",
"Coroutine created at (most recent call last)\n",
f' File "{a1_filename}", line {a1_lineno}, in a1\n',
f' return corofn() # comment in a1',
]))
check(2, "".join([
f"coroutine '{corofn.__qualname__}' was never awaited\n",
"Coroutine created at (most recent call last)\n",
f' File "{a2_filename}", line {a2_lineno}, in a2\n',
f' return a1() # comment in a2\n',
f' File "{a1_filename}", line {a1_lineno}, in a1\n',
f' return corofn() # comment in a1',
]))
finally:
sys.set_coroutine_origin_tracking_depth(orig_depth)
def test_unawaited_warning_when_module_broken(self):
# Make sure we don't blow up too bad if
# warnings._warn_unawaited_coroutine is broken somehow (e.g. because
# of shutdown problems)
async def corofn():
pass
orig_wuc = warnings._warn_unawaited_coroutine
try:
warnings._warn_unawaited_coroutine = lambda coro: 1/0
with support.catch_unraisable_exception() as cm, \
warnings_helper.check_warnings(
(r'coroutine .* was never awaited',
RuntimeWarning)):
# only store repr() to avoid keeping the coroutine alive
coro = corofn()
coro_repr = repr(coro)
# clear reference to the coroutine without awaiting for it
del coro
support.gc_collect()
self.assertEqual(repr(cm.unraisable.object), coro_repr)
self.assertEqual(cm.unraisable.exc_type, ZeroDivisionError)
del warnings._warn_unawaited_coroutine
with warnings_helper.check_warnings(
(r'coroutine .* was never awaited', RuntimeWarning)):
corofn()
support.gc_collect()
finally:
warnings._warn_unawaited_coroutine = orig_wuc
class UnawaitedWarningDuringShutdownTest(unittest.TestCase):
# https://bugs.python.org/issue32591#msg310726
def test_unawaited_warning_during_shutdown(self):
code = ("import asyncio\n"
"async def f(): pass\n"
"asyncio.gather(f())\n")
assert_python_ok("-c", code)
code = ("import sys\n"
"async def f(): pass\n"
"sys.coro = f()\n")
assert_python_ok("-c", code)
code = ("import sys\n"
"async def f(): pass\n"
"sys.corocycle = [f()]\n"
"sys.corocycle.append(sys.corocycle)\n")
assert_python_ok("-c", code)
@support.cpython_only
class CAPITest(unittest.TestCase):
def test_tp_await_1(self):
from _testcapi import awaitType as at
async def foo():
future = at(iter([1]))
return (await future)
self.assertEqual(foo().send(None), 1)
def test_tp_await_2(self):
# Test tp_await to __await__ mapping
from _testcapi import awaitType as at
future = at(iter([1]))
self.assertEqual(next(future.__await__()), 1)
def test_tp_await_3(self):
from _testcapi import awaitType as at
async def foo():
future = at(1)
return (await future)
with self.assertRaisesRegex(
TypeError, "__await__.*returned non-iterator of type 'int'"):
self.assertEqual(foo().send(None), 1)
if __name__=="__main__":
unittest.main()
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