validations.py 文件源码

def Alphanumeric(msg=None):
    '''
    Checks whether a value is:
        - int, or
        - long, or
        - float without a fractional part, or
        - str or unicode composed only of alphanumeric characters
    '''
    def fn(value):
        if not any([
            isinstance(value, numbers.Integral),
            (isinstance(value, float) and value.is_integer()),
            (isinstance(value, basestring) and value.isalnum())
        ]):
            raise Invalid(msg or (
                'Invalid input <{0}>; expected an integer'.format(value))
            )
        else:
            return value
    return fn