validators.py 文件源码

def boolify(value):
    """ Function that will translate common strings into bool values

    True -> "True", "t", "yes", "y", "on", "1"
    False -> any other string

    Objects other than string will be transformed
    using built-in bool() function.
    """
    if isinstance(value, basestring):
        try:
            return bool(strtobool(value))
        except ValueError:
            return False
    else:
        return bool(value)