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yield_from_test.py
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yield_from_test.py
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import pytest
from pyupgrade._data import Settings
from pyupgrade._main import _fix_plugins
@pytest.mark.parametrize(
('s', 'expected'),
(
(
'def f():\n'
' for x in y:\n'
' yield x',
'def f():\n'
' yield from y\n',
),
(
'def f():\n'
' for x in [1, 2, 3]:\n'
' yield x',
'def f():\n'
' yield from [1, 2, 3]\n',
),
(
'def f():\n'
' for x in {x for x in y}:\n'
' yield x',
'def f():\n'
' yield from {x for x in y}\n',
),
(
'def f():\n'
' for x in (1, 2, 3):\n'
' yield x',
'def f():\n'
' yield from (1, 2, 3)\n',
),
(
'def f():\n'
' for x, y in {3: "x", 6: "y"}:\n'
' yield x, y',
'def f():\n'
' yield from {3: "x", 6: "y"}\n',
),
(
'def f(): # Comment one\n'
' # Comment two\n'
' for x, y in { # Comment three\n'
' 3: "x", # Comment four\n'
' # Comment five\n'
' 6: "y" # Comment six\n'
' }: # Comment seven\n'
' # Comment eight\n'
' yield x, y # Comment nine\n'
' # Comment ten',
'def f(): # Comment one\n'
' # Comment two\n'
' yield from { # Comment three\n'
' 3: "x", # Comment four\n'
' # Comment five\n'
' 6: "y" # Comment six\n'
' }\n',
),
(
'def f():\n'
' for x, y in [{3: (3, [44, "long ss"]), 6: "y"}]:\n'
' yield x, y',
'def f():\n'
' yield from [{3: (3, [44, "long ss"]), 6: "y"}]\n',
),
(
'def f():\n'
' for x, y in z():\n'
' yield x, y',
'def f():\n'
' yield from z()\n',
),
(
'def f():\n'
' def func():\n'
' # This comment is preserved\n'
'\n'
' for x, y in z(): # Comment one\n'
'\n'
' # Commment two\n'
' yield x, y # Comment three\n'
' # Comment four\n'
'\n\n'
'# Comment\n'
'def g():\n'
' print(3)',
'def f():\n'
' def func():\n'
' # This comment is preserved\n'
'\n'
' yield from z()\n'
'\n\n'
'# Comment\n'
'def g():\n'
' print(3)',
),
(
'async def f():\n'
' for x in [1, 2]:\n'
' yield x\n'
'\n'
' def g():\n'
' for x in [1, 2, 3]:\n'
' yield x\n'
'\n'
' for x in [1, 2]:\n'
' yield x\n'
'\n'
' return g',
'async def f():\n'
' for x in [1, 2]:\n'
' yield x\n'
'\n'
' def g():\n'
' yield from [1, 2, 3]\n'
'\n'
' for x in [1, 2]:\n'
' yield x\n'
'\n'
' return g',
),
pytest.param(
'def f():\n'
' for x in y:\n'
' yield x\n'
' for z in x:\n'
' yield z\n',
'def f():\n'
' for x in y:\n'
' yield x\n'
' yield from x\n',
id='leave one loop alone (referenced after assignment)',
),
),
)
def test_fix_yield_from(s, expected):
assert _fix_plugins(s, settings=Settings(min_version=(3,))) == expected
@pytest.mark.parametrize(
's',
(
'def f():\n'
' for x in z:\n'
' yield',
'def f():\n'
' for x in z:\n'
' yield y',
'def f():\n'
' for x, y in z:\n'
' yield x',
'def f():\n'
' for x, y in z:\n'
' yield y',
'def f():\n'
' for a, b in z:\n'
' yield x, y',
'def f():\n'
' for x, y in z:\n'
' yield y, x',
'def f():\n'
' for x, y, c in z:\n'
' yield x, y',
'def f():\n'
' for x in z:\n'
' x = 22\n'
' yield x',
'def f():\n'
' for x in z:\n'
' yield x\n'
' else:\n'
' print("boom!")\n',
pytest.param(
'def f():\n'
' for x in range(5):\n'
' yield x\n'
' print(x)\n',
id='variable referenced after loop',
),
pytest.param(
'def f():\n'
' def g():\n'
' print(x)\n'
' for x in range(5):\n'
' yield x\n'
' g()\n',
id='variable referenced after loop, but via function',
),
pytest.param(
'def f():\n'
' def g():\n'
' def h():\n'
' print(x)\n'
' return h\n'
' for x in range(5):\n'
' yield x\n'
' g()()\n',
id='variable referenced after loop, but via nested function',
),
pytest.param(
'def f(x):\n'
' del x\n',
id='regression with del ctx (#306)',
),
),
)
def test_fix_yield_from_noop(s):
assert _fix_plugins(s, settings=Settings(min_version=(3,))) == s