Function _check_echo_char

Lib/getpass.py:197–210

(echo_char)

def _check_echo_char(echo_char):
    # Single-character ASCII excluding control characters
    if echo_char is None:
        return
    if not isinstance(echo_char, str):
        raise TypeError("'echo_char' must be a str or None, not "
                        f"{type(echo_char).__name__}")
    if not (
        len(echo_char) == 1
        and echo_char.isprintable()
        and echo_char.isascii()
    ):
        raise ValueError("'echo_char' must be a single printable ASCII "
                         f"character, got: {echo_char!r}")


def _raw_input(prompt="", stream=None, input=None, echo_char=None,