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gh-128862: use importlib.resources to acquire doctest resources #128865

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gh-128862: use importlib.resources to acquire doctest resources #128865

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gh-128862: use importlib.resources to acquire doctest resources
graingert Jan 15, 2025
626233e
only compute module relative path when falling back from importlib.re…
graingert Jan 15, 2025
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📜🤖 Added by blurb_it.
blurb-it[bot] Jan 15, 2025
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Update Lib/doctest.py
graingert Jan 15, 2025
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Merge branch 'main' into use-importlib-resources-for-doctest
graingert Jan 15, 2025
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Merge branch 'main' into use-importlib-resources-for-doctest
graingert Jan 21, 2025
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Merge branch 'main' into use-importlib-resources-for-doctest
graingert Jan 26, 2025
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Merge branch 'main' into use-importlib-resources-for-doctest
graingert Feb 2, 2025
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Update Lib/doctest.py
graingert Mar 20, 2025
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Merge branch 'main' into use-importlib-resources-for-doctest
graingert Mar 20, 2025
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Update doctest.py
graingert Mar 21, 2025
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Update Lib/doctest.py
AA-Turner Apr 17, 2025
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Merge branch 'main' into use-importlib-resources-for-doctest
AA-Turner May 1, 2025
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Merge branch 'main' into use-importlib-resources-for-doctest
graingert May 1, 2025
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AA-Turner May 1, 2025
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Update 2025-01-15-11-57-42.gh-issue-128862.TDHQdR.rst
AA-Turner May 5, 2025
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25 changes: 9 additions & 16 deletions 25 Lib/doctest.py
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Original file line number Diff line number Diff line change
Expand Up @@ -93,6 +93,7 @@ def _test():
]

import __future__
import contextlib
import difflib
import inspect
import linecache
Expand All @@ -102,7 +103,8 @@ def _test():
import sys
import traceback
import unittest
from io import StringIO, IncrementalNewlineDecoder
import importlib.resources
from io import StringIO
from collections import namedtuple
import _colorize # Used in doctests
from _colorize import ANSIColors, can_colorize
Expand Down Expand Up @@ -235,25 +237,16 @@ def _normalize_module(module, depth=2):
else:
raise TypeError("Expected a module, string, or None")

def _newline_convert(data):
# The IO module provides a handy decoder for universal newline conversion
return IncrementalNewlineDecoder(None, True).decode(data, True)

def _load_testfile(filename, package, module_relative, encoding):
if module_relative:
package = _normalize_module(package, 3)
with contextlib.suppress(Exception):
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What exceptions should be suppressed?

Exception is too wide class. It includes OSError, UnicodeDecodingError, MemoryError, which currently are not suppressed.

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@AA-Turner AA-Turner Apr 9, 2025 •
edited
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This control flow feels odd, because we're returning in a suppress context manager.

Perhaps:

text = None
if module_relative:
    package = _normalize_module(package, depth=3)
    try:
        file = importlib.resources.files(package) / filename
        text = file.read_text(encoding=encoding)
    except AttributeError:
        filename = _module_relative_path(package, filename)

if text is None:
    with open(filename, encoding=encoding) as f:
        text = f.read()

return text, filename

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cc @graingert, are you able to get to this before Tuesday (feature freeze)?

A

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I think @jaraco has taken over this PR

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I've applied my suggestion, narrowing from Exception to AttributeError, per Jason above:

Even better would be if importlib.resources could throw a more specific exception when the indicated module is unable to resolve resources, but since it currently just raises an AttributeError, perhaps it's best to just trap that exception, rather than try to pre-emptively detect that exception will occur.

text = importlib.resources.read_text(package, filename,
encoding=encoding)
return text, filename

filename = _module_relative_path(package, filename)
if (loader := getattr(package, '__loader__', None)) is None:
try:
loader = package.__spec__.loader
except AttributeError:
pass
if hasattr(loader, 'get_data'):
file_contents = loader.get_data(filename)
file_contents = file_contents.decode(encoding)
# get_data() opens files as 'rb', so one must do the equivalent
# conversion as universal newlines would do.
return _newline_convert(file_contents), filename

with open(filename, encoding=encoding) as f:
return f.read(), filename

Expand Down
1 change: 1 addition & 0 deletions 1 Misc/NEWS.d/next/Library/2025-01-15-11-57-42.gh-issue-128862.TDHQdR.rst
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@@ -0,0 +1 @@
Use ``importlib.resources`` to acquire test files in ``doctest``
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