Function _check_tzname

Lib/_pydatetime.py:544–547

(name)

# Just raise TypeError if the arg isn't None or a string.
def _check_tzname(name):
    if name is not None and not isinstance(name, str):
        raise TypeError("tzinfo.tzname() must return None or string, "
                        f"not {type(name).__name__!r}")

# name is the offset-producing method, "utcoffset" or "dst".
# offset is what it returned.