csv.py 文件源码

def __call__(self, context):

        if isinstance(self._object, types.StringTypes):
            self._object = context[self._object]

        # get dialect object
        if isinstance(self._dialect, types.StringTypes):
            dialect = csv.get_dialect(self._dialect)

        if self._path.startswith("memory:"):
            buffer_ = StringIO.StringIO()
            self._write_object(buffer_, dialect)
            buffer_.seek(0)
            context[self._path[len("memory:"):]] = buffer_
        else:
            with open(self._path, "w") as f:
                self._write_object(f, dialect)
        return self._path