requests 下载大文件

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# -*- coding: utf-8 -*- from contextlib import closing from requests import get url = 'https://www.test.video/aa' # 但是使用with语句的时候是需要条件的，任何对象，只要正确实现了上下文管理，就可以使用with语句，实现上下文管理是通过__enter__和__exit__这两个方法实现的 with closing(get(url,  stream=True)) as response:     chunk_size = 1024  # 单次请求最大值     # response.headers['content-length']得到的数据类型是str而不是int     content_size = int(response.headers['content-length'])  # 文件总大小     data_count = 0  # 当前已传输的大小     with open('文件名.mp4', "wb") as file:         for data in response.iter_content(chunk_size=chunk_size):             file.write(data)             done_block = int((data_count / content_size) * 50)             # 已经下载的文件大小             data_count = data_count + len(data)             # 实时进度条进度             now_jd = (data_count / content_size) * 100             ## %% 表示%             print("\r [%s%s] %d%% " % (done_block * '█', ' ' * (50 - 1 - done_block), now_jd), end=" ")