Mar 25, 2026
diff --git a/Lib/shlex.py b/Lib/shlex.py
    return ' '.join(quote(arg) for arg in split_command)


 def _find_unsafe_lazy(s):
    import re  # deferred import and compilation for performance

    global _find_unsafe
    _find_unsafe = re.compile(r'[^\w@%+=:,./-]', re.ASCII).search
    return _find_unsafe(s)


 _find_unsafe = _find_unsafe_lazy


 def quote(s):
    """Return a shell-escaped version of the string *s*."""
    if not s:
        return "''"

    if not isinstance(s, str):
        raise TypeError(f"expected string object, got {type(s).__name__!r}")

    # Use bytes.translate() for performance
    safe_chars = (b'%+,-./0123456789:=@'
                  b'ABCDEFGHIJKLMNOPQRSTUVWXYZ_'
                  b'abcdefghijklmnopqrstuvwxyz')
    # No quoting is needed if `s` is an ASCII string consisting only of `safe_chars`
    if s.isascii() and not s.encode().translate(None, delete=safe_chars):
    if _find_unsafe(s) is None:
        return s

    # use single quotes, and put single quotes into double quotes
Original file line number	Diff line number	Diff line change
Expand Up		@@ -317,20 +317,22 @@ def join(split_command):
		return ' '.join(quote(arg) for arg in split_command)


		def _find_unsafe_lazy(s):
		import re # deferred import and compilation for performance

		global _find_unsafe
		_find_unsafe = re.compile(r'[^\w@%+=:,./-]', re.ASCII).search
		return _find_unsafe(s)


		_find_unsafe = _find_unsafe_lazy


		def quote(s):
		"""Return a shell-escaped version of the string s."""
		if not s:
		return "''"

		if not isinstance(s, str):
		raise TypeError(f"expected string object, got {type(s).__name__!r}")

		# Use bytes.translate() for performance
		safe_chars = (b'%+,-./0123456789:=@'
		b'ABCDEFGHIJKLMNOPQRSTUVWXYZ_'
		b'abcdefghijklmnopqrstuvwxyz')
		# No quoting is needed if `s` is an ASCII string consisting only of `safe_chars`
		if s.isascii() and not s.encode().translate(None, delete=safe_chars):
		if _find_unsafe(s) is None:
		return s

		# use single quotes, and put single quotes into double quotes
Expand Down