Merge pull request #7128 from bayandin/patch-1

rewrite_python_shebang: move loop invariants out of loop

Library/Homebrew/language/python.rb

@@ -88,9 +88,9 @@ module Language
     end
 
     def self.rewrite_python_shebang(python_path)
+      regex = %r{^#! ?/usr/bin/(env )?python([23](\.\d{1,2})?)$}
+      maximum_regex_length = 28 # the length of "#! /usr/bin/env pythonx.yyy$"
       Pathname(".").find do |f|
-        regex = %r{^#! ?/usr/bin/(env )?python([23](\.\d{1,2})?)$}
-        maximum_regex_length = "#! /usr/bin/env pythonx.yyy$".length
         next unless f.file?
         next unless regex.match?(f.read(maximum_regex_length))