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gh-130167: Improve speed of difflib.IS_LINE_JUNK by replacing re #130170

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gh-130167: Improve speed of difflib.IS_LINE_JUNK by replacing re #130170

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8f2670d
Improve speed of difflib.IS_LINE_JUNK by replacing re
donBarbos Feb 16, 2025
0fae9c5
Update difflib.py
donBarbos Feb 16, 2025
352b4bc
Update difflib.py
donBarbos Feb 16, 2025
0ab8da8
Add backward compatibility
donBarbos Feb 16, 2025
64dff4a
Update difflib.py
donBarbos Feb 16, 2025
32337c3
Update Lib/difflib.py
donBarbos Feb 16, 2025
390b6e7
Update difflib.py
donBarbos Feb 17, 2025
30d4535
Back `iff` word
donBarbos Feb 18, 2025
0e7293d
Update difflib
donBarbos Feb 18, 2025
bcf45a3
Update difflib.py
donBarbos Feb 18, 2025
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9 changes: 4 additions & 5 deletions Lib/difflib.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1038,11 +1038,9 @@ def _qformat(self, aline, bline, atags, btags):
# remaining is that perhaps it was really the case that " volatile"
# was inserted after "private". I can live with that <wink>.

import re

def IS_LINE_JUNK(line, pat=re.compile(r"\s*(?:#\s*)?$").match):
def IS_LINE_JUNK(line, pat=None):
r"""
Return True for ignorable line: iff `line` is blank or contains a single '#'.
Return True for ignorable line: if `line` is blank or contains a single '#'.

Examples:

Expand All @@ -1054,6 +1052,8 @@ def IS_LINE_JUNK(line, pat=re.compile(r"\s*(?:#\s*)?$").match):
False
"""

if pat is None:
return line.strip() in '#'
return pat(line) is not None

def IS_CHARACTER_JUNK(ch, ws=" \t"):
Expand Down Expand Up @@ -2027,7 +2027,6 @@ def make_table(self,fromlines,tolines,fromdesc='',todesc='',context=False,
replace('\1','</span>'). \
replace('\t','&nbsp;')

del re

def restore(delta, which):
r"""
Expand Down
2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Library/2025-02-16-06-25-01.gh-issue-130167.kUg7Rc.rst
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@@ -0,0 +1,2 @@
Improve speed of :func:`difflib.IS_LINE_JUNK` by replacing :mod:`re` with
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Using re or built-in string methods is an implementation detail. This does not concern users and is not of interest to them.

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@donBarbos donBarbos Feb 17, 2025 •
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@serhiy-storchaka ok so should I remove NEWS.d entry or replace with something else. I just took as a sample news entries from PRs related to issue on improving importtime

built-in string methods.
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