multipart.py 文件源码

def __init__(self, encoder, callback=None):
        #: Instance of the :class:`MultipartEncoder` being monitored
        self.encoder = encoder

        #: Optionally function to call after a read
        self.callback = callback or IDENTITY

        #: Number of bytes already read from the :class:`MultipartEncoder`
        #: instance
        self.bytes_read = 0

        #: Avoid the same problem in bug #80
        self.len = self.encoder.len