importreimportshleximporttimeit# From 3.13_find_unsafe=re.compile(r'[^\w@%+=:,./-]',re.ASCII).searchdefold_quote(s):"""Return a shell-escaped version of the string *s*."""ifnots:return"''"# BEST: if s.isascii() and _find_unsafe(s) is None:if_find_unsafe(s)isNone:returns# use single quotes, and put single quotes into double quotes# the string $'b is then quoted as '$'"'"'b'return"'"+s.replace("'","'\"'\"'")+"'"g= {'old_quote':old_quote,'new_quote':shlex.quote}print('with spaces')print('  old',timeit.timeit("old_quote('the quick brown fox jumps over the lazy dog')",globals=g,number=1000000))print('  new',timeit.timeit("new_quote('the quick brown fox jumps over the lazy dog')",globals=g,number=1000000))print('without spaces')print('  old',timeit.timeit("old_quote('thequickbrownfoxjumpsoverthelazydog')",globals=g,number=1000000))print('  new',timeit.timeit("new_quote('thequickbrownfoxjumpsoverthelazydog')",globals=g,number=1000000))print('non-ASCII')print('  old',timeit.timeit("old_quote('mötley')",globals=g,number=1000000))print('  new',timeit.timeit("new_quote('mötley')",globals=g,number=1000000))print('short')print('  old',timeit.timeit("old_quote('a')",globals=g,number=1000000))print('  new',timeit.timeit("new_quote('a')",globals=g,number=1000000))

with spaces  old 0.4148377259989502  new 0.5036935329990229without spaces  old 0.3872929839999415  new 0.3540855330065824ascii  old 0.4636239370011026  new 0.20726546400692314short  old 0.1217202929983614  new 0.2977778149943333