requests上传文件进度条

import os
import requests


class ChunkIO:

    def __init__(self, f, size, callback=None):
        self.f = f
        self.size = size
        self.callback = callback

    def __iter__(self):
        count = 0
        for data in iter(self.f):
            count += len(data)
            yield data
            if self.callback:
                self.callback("\r  %.2fM <-- %.2fM 进度：%d%%" % (self.size/1048576, self.size/1048576, count / self.size * 100), end=" ")

    def read(self, size=-1):
        return self.f.read(size)


if __name__ == '__main__':
    size = os.stat(__file__).st_size
    with open(__file__, 'rb') as f:
        resp = requests.post('http://httpbin.org/post', data=ChunkIO(f, size, callback=print))
        print(resp.status_code)