namedlist.py 文件源码

def _check_common(self, name, type_of_name):
        # tests that are common to both field names and the type name
        if len(name) == 0:
            raise ValueError('{0} names cannot be zero '
                             'length: {1!r}'.format(type_of_name, name))
        if _PY2:
            if not all(c.isalnum() or c=='_' for c in name):
                raise ValueError('{0} names can only contain '
                                 'alphanumeric characters and underscores: '
                                 '{1!r}'.format(type_of_name, name))
            if name[0].isdigit():
                raise ValueError('{0} names cannot start with a '
                                 'number: {1!r}'.format(type_of_name, name))
        else:
            if not name.isidentifier():
                raise ValueError('{0} names names must be valid '
                                 'identifiers: {1!r}'.format(type_of_name, name))
        if _iskeyword(name):
            raise ValueError('{0} names cannot be a keyword: '
                             '{1!r}'.format(type_of_name, name))