May 2017
Intermediate to advanced
628 pages
19h 29m
Chinese
Content preview from 流畅的Python
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434
｜
第
17
章
➏
download_one
函数的返回值是一个
namedtuple
——
Result
，其中有个
status
字段，其
值是
HTTPStatus.not_found
或
HTTPStatus.ok
。
示例
17-13
列出的是
download_many
函数的依序下载版。代码虽然简单，不过值得分析一
下，以便后面与并发版对比。我们要关注的是报告进度、处理错误和统计下载数量的方式。
示例
17-13
flags2_sequential.py
：实现依序下载的
download_many
函数
def download_many(cc_list, base_url, verbose, max_req):
counter = collections.Counter()
➊
cc_iter = sorted(cc_list)
➋
if not verbose:
cc_iter = tqdm.tqdm(cc_iter)
➌
for cc in cc_iter:
➍
try:
res = download_one(cc, base_url, verbose)
➎
except requests.exceptions.HTTPError as exc:
➏
error_msg = 'HTTP error {res.status_code} - {res.reason}'
error_msg = error_msg.format(res=exc.response)
except requests.exceptions.ConnectionError ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.