[Python-checkins] gh-104273: Remove redundant len() calls in argparse function (#104274)

[terryjreedy]

https://github.com/python/cpython/commit/01cc9c1ff79bf18fe34c05c6cd573e79ff9487c3
commit: 01cc9c1ff79bf18fe34c05c6cd573e79ff9487c3
branch: main
author: Burak Saler <59198732+buraksaler at users.noreply.github.com>
committer: terryjreedy <tjreedy at udel.edu>
date: 2023-05-07T19:43:50-04:00
summary:

gh-104273: Remove redundant len() calls in argparse function (#104274)

files:
M Lib/argparse.py

diff --git a/Lib/argparse.py b/Lib/argparse.py
index 68089a5c1e80..f5f44ff02c0d 100644
--- a/Lib/argparse.py
+++ b/Lib/argparse.py
@@ -345,21 +345,22 @@ def _format_usage(self, usage, actions, groups, prefix):
                 def get_lines(parts, indent, prefix=None):
                     lines = []
                     line = []
+                    indent_length = len(indent)
                     if prefix is not None:
                         line_len = len(prefix) - 1
                     else:
-                        line_len = len(indent) - 1
+                        line_len = indent_length - 1
                     for part in parts:
                         if line_len + 1 + len(part) > text_width and line:
                             lines.append(indent + ' '.join(line))
                             line = []
-                            line_len = len(indent) - 1
+                            line_len = indent_length - 1
                         line.append(part)
                         line_len += len(part) + 1
                     if line:
                         lines.append(indent + ' '.join(line))
                     if prefix is not None:
-                        lines[0] = lines[0][len(indent):]
+                        lines[0] = lines[0][indent_length:]
                     return lines
 
                 # if prog is short, follow it with optionals or positionals