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gh-131178: Use `support.captured_stdout` and `support.captured_stderr` by donbarbos · Pull Request #137748 · python/cpython · GitHub

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gh-131178: Use support.captured_stdout and support.captured_stderr #137748

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gh-131178: Use support.captured_stdout and support.captured_stderr #137748

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86a7158
gh-131178: Use `support.captured_stdout()` and `support.captured_stde…
donbarbos Aug 14, 2025
9f3100d
Fix test_unknown_flag for platform
donbarbos Aug 14, 2025
0d289d4
Revert changes
donbarbos Aug 14, 2025
092a1c5
Revert missing regrtest
donbarbos Aug 14, 2025
8a538cc
Revert platform test fix
donbarbos Aug 14, 2025
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11 changes: 3 additions & 8 deletions Lib/test/test_ast/test_ast.py
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Original file line number Diff line number Diff line change
@@ -1,7 +1,6 @@
import _ast_unparse
import ast
import builtins
import contextlib
import copy
import dis
import enum
Expand All @@ -14,7 +13,6 @@
import types
import unittest
import weakref
from io import StringIO
from pathlib import Path
from textwrap import dedent
try:
Expand Down Expand Up @@ -3417,11 +3415,9 @@ def set_source(self, content):
Path(self.filename).write_text(self.text_normalize(content))

def invoke_ast(self, *flags):
stderr = StringIO()
stdout = StringIO()
with (
contextlib.redirect_stdout(stdout),
contextlib.redirect_stderr(stderr),
support.captured_stdout() as stdout,
support.captured_stderr() as stderr,
):
ast.main(args=[*flags, self.filename])
self.assertEqual(stderr.getvalue(), '')
Expand Down Expand Up @@ -3462,9 +3458,8 @@ def f(x: int) -> int:
def test_help_message(self):
for flag in ('-h', '--help', '--unknown'):
with self.subTest(flag=flag):
output = StringIO()
with self.assertRaises(SystemExit):
with contextlib.redirect_stderr(output):
with support.captured_stderr() as output:
ast.main(args=flag)
self.assertStartsWith(output.getvalue(), 'usage: ')

Expand Down
7 changes: 2 additions & 5 deletions Lib/test/test_pickle.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,6 @@
NAME_MAPPING, REVERSE_NAME_MAPPING)
import builtins
import collections
import contextlib
import io
import pickle
import struct
Expand Down Expand Up @@ -728,8 +727,7 @@ def set_pickle_data(self, data):
pickle.dump(data, f)

def invoke_pickle(self, *flags):
output = io.StringIO()
with contextlib.redirect_stdout(output):
with support.captured_stdout() as output:
pickle._main(args=[*flags, self.filename])
return self.text_normalize(output.getvalue())

Expand All @@ -754,10 +752,9 @@ def test_invocation(self):

@support.force_not_colorized
def test_unknown_flag(self):
stderr = io.StringIO()
with self.assertRaises(SystemExit):
# check that the parser help is shown
with contextlib.redirect_stderr(stderr):
with support.captured_stderr() as stderr:
_ = self.invoke_pickle('--unknown')
self.assertStartsWith(stderr.getvalue(), 'usage: ')

Expand Down
6 changes: 2 additions & 4 deletions Lib/test/test_tokenize.py
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Original file line number Diff line number Diff line change
@@ -1,4 +1,3 @@
import contextlib
import itertools
import os
import re
Expand Down Expand Up @@ -3181,8 +3180,7 @@ def set_source(self, content):
fp.write(content)

def invoke_tokenize(self, *flags):
output = StringIO()
with contextlib.redirect_stdout(output):
with support.captured_stdout() as output:
tokenize._main(args=[*flags, self.filename])
return self.text_normalize(output.getvalue())

Expand All @@ -3209,7 +3207,7 @@ def f():

with self.assertRaises(SystemExit):
# suppress argparse error message
with contextlib.redirect_stderr(StringIO()):
with support.captured_stderr():
_ = self.invoke_tokenize('--unknown')

def test_without_flag(self):
Expand Down
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