(cls, prefixlen_str)
return prefixlen
Return prefix length from a numeric string

        Args:
            prefixlen_str: The string to be converted

        Returns:
            An integer, the prefix length.

        Raises:
            NetmaskValueError: If the input is not a valid netmask
Return prefix length from a numeric string
Return prefix length from a numeric string
def _prefix_from_prefix_string(cls, prefixlen_str):
        """Return prefix length from a numeric string

        Args:
            prefixlen_str: The string to be converted

        Returns:
            An integer, the prefix length.

        Raises:
            NetmaskValueError: If the input is not a valid netmask
        """
        # int allows a leading +/- as well as surrounding whitespace,
        # so we ensure that isn't the case
        if not _BaseV4._DECIMAL_DIGITS.issuperset(prefixlen_str):
            cls._report_invalid_netmask(prefixlen_str)
        try:
            prefixlen = int(prefixlen_str)
        except ValueError:
            cls._report_invalid_netmask(prefixlen_str)
        if not (0 <= prefixlen <= cls._max_prefixlen):
            cls._report_invalid_netmask(prefixlen_str)
        return prefixlen
def _prefix_from_prefix_string ( cls , prefixlen_str ) : # int allows a leading +/- as well as surrounding whitespace, # so we ensure that isn't the case if not _BaseV4 . _DECIMAL_DIGITS . issuperset ( prefixlen_str ) : cls . _report_invalid_netmask ( prefixlen_str ) try : prefixlen = int ( prefixlen_str ) except ValueError : cls . _report_invalid_netmask ( prefixlen_str ) if not ( 0 <= prefixlen <= cls . _max_prefixlen ) : cls . _report_invalid_netmask ( prefixlen_str ) return prefixlen