gh-118761: improve optparse import time by delaying textwrap import

eli-schwartz · eli-schwartz · commit 10cd15234979 · 2025-01-16T19:43:15.000-05:00
The same change was made, and for the same reason, by argparse back in 2017. The textwrap module is only used when printing help text, so most invocations will never need it imported. See: #1269 See: 8110837
diff --git a/Lib/optparse.py b/Lib/optparse.py
@@ -74,7 +74,6 @@
 """
 
 import sys, os
-import textwrap
 from gettext import gettext as _, ngettext
 
 
@@ -252,6 +251,7 @@ def _format_text(self, text):
         Format a paragraph of free-form text for inclusion in the
         help output at the current indentation level.
         """
+        import textwrap
         text_width = max(self.width - self.current_indent, 11)
         indent = " "*self.current_indent
         return textwrap.fill(text,
@@ -308,6 +308,7 @@ def format_option(self, option):
             indent_first = 0
         result.append(opts)
         if option.help:
+            import textwrap
             help_text = self.expand_default(option)
             help_lines = textwrap.wrap(help_text, self.help_width)
             result.append("%*s%s\n" % (indent_first, "", help_lines[0]))
diff --git a/Misc/NEWS.d/next/Library/2025-01-15-18-54-48.gh-issue-118761.G1dv6E.rst b/Misc/NEWS.d/next/Library/2025-01-15-18-54-48.gh-issue-118761.G1dv6E.rst
@@ -0,0 +1,2 @@
+Reduce the import time of :mod:`optparse` when no help text is printed.
+Patch by Eli Schwartz.

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,2 @@`
	`1`	+Reduce the import time of :mod:`optparse` when no help text is printed.
	`2`	`+Patch by Eli Schwartz.`