我应该在 urllib.urlopen() 之后调用 close() 吗? [英] should I call close() after urllib.urlopen()?

问题描述

我是 Python 新手，正在阅读别人的代码:

I'm new to Python and reading someone else's code:

是否应该在urllib.urlopen() 后接urllib.close()?否则，会泄漏连接，对吗?

should urllib.urlopen() be followed by urllib.close()? Otherwise, one would leak connections, correct?

推荐答案

必须在 urllib.urlopenresult 上调用 close 方法>, not 在您所考虑的 urllib 模块本身上(正如您提到的 urllib.close - 它不存在).

The close method must be called on the result of urllib.urlopen, not on the urllib module itself as you're thinking about (as you mention urllib.close -- which doesn't exist).

最好的方法:代替 x = urllib.urlopen(u) 等，使用:

The best approach: instead of x = urllib.urlopen(u) etc, use:

import contextlib

with contextlib.closing(urllib.urlopen(u)) as x:
   ...use x at will here...

with 语句和 closure 上下文管理器将确保即使出现异常也能正确关闭.

The with statement, and the closing context manager, will ensure proper closure even in presence of exceptions.

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