<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def to_python(self, value):
 """ Converts the input value into the expected Python data type, raising django.core.exceptions.ValidationError if the data can't be converted. Returns the converted value. Subclasses should override this. """

        assert isinstance(value, list)

        # convert every value in list
        value = list(value)
        for i, v in enumerate(value):
            value[i] = self.value_to_python(v)

        # return result
        return value