os.environ对C扩展模块的可见性 | environ对C扩展模块的可见性

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问题描述

如果我使用 os.environ 更改环境变量，那么以后导入的模块会看到这个变化吗？

具体来说， sqlite3 说：

所以如果SQLite库在更改os.environ

If I change environment variable using os.environ, do the modules I import afterwards see that change?

Specifically, sqlite3 requires the use of an environment variable to determine its temporary file location. But if I use os.environ['SQLITE_TMPDIR'] = '.' before import sqlite3, it does not have the desired effect. Why?

解决方案

The sqlite3 module is just a wrapper for the SQLite C library, so it will not directly see any changes made to os.environ.

However, the documentation says:

So if the SQLite library is initialized after you've changed os.environ, it will see the changes.

Please note that SQLite reads different environment variables on Unix-y OSes and on Windows.

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