def _deserialize()

in lemur/common/fields.py [0:0]

• 26 lines of code
• 9 McCabe index (conditional complexity)

    def _deserialize(self, value, attr, data):
        if not value:  # Falsy values, e.g. '', None, [] are not valid
            raise self.fail("invalid")
        self.dateformat = self.dateformat or self.DEFAULT_FORMAT
        func = self.DATEFORMAT_DESERIALIZATION_FUNCS.get(self.dateformat)
        if func:
            try:
                return arrow.get(func(value))
            except (TypeError, AttributeError, ValueError):
                raise self.fail("invalid")
        elif self.dateformat:
            try:
                return dt.datetime.strptime(value, self.dateformat)
            except (TypeError, AttributeError, ValueError):
                raise self.fail("invalid")
        elif utils.dateutil_available:
            try:
                return arrow.get(utils.from_datestring(value))
            except TypeError:
                raise self.fail("invalid")
        else:
            warnings.warn(
                "It is recommended that you install python-dateutil "
                "for improved datetime deserialization."
            )
            raise self.fail("invalid")