fields.py 文件源码

def StringField(default=NOTHING, required=True, repr=True, cmp=True,
                key=None):
    """
    Create new str field on a model.

    :param default: any string value
    :param bool required: whether or not the object is invalid if not provided.
    :param bool repr: include this field should appear in object's repr.
    :param bool cmp: include this field in generated comparison.
    :param string key: override name of the value when converted to dict.
    """
    default = _init_fields.init_default(required, default, None)
    validator = _init_fields.init_validator(required, string_types)
    return attrib(default=default, convert=converters.str_if_not_none,
                  validator=validator, repr=repr, cmp=cmp,
                  metadata=dict(key=key))