feature.py 文件源码

def __getitem__(self, index):
        """
        Gets the Field object at the specified index, which may be either
        an integer or the Field's string label.  Note that the Field object
        is not the field's _value_ -- use the `get` method instead to
        retrieve the value (e.g. an integer) instead of a Field instance.
        """
        if isinstance(index, six.string_types):
            i = self.index(index)
        else:
            if index < 0 or index > self.num_fields:
                raise OGRIndexError('index out of range')
            i = index
        return Field(self, i)