validations.py 文件源码

def StrictlyAlphanumeric(msg=None):
    '''
    Checks whether a value is:
        - str or unicode, and
        - composed of both alphabets and digits
    '''
    def fn(value):
        if not (
            isinstance(value, basestring) and
            value.isalnum() and not
            value.isdigit() and not
            value.isalpha()
        ):
            raise Invalid(msg or (
                'Invalid input <{0}>; expected an integer'.format(value))
            )
        else:
            return value
    return fn