Two unrelated ideas mixed in one paragraph of the tutorial (`sys.path` section)

In the “The Module Search Path” section of the Python Tutorial, the following paragraph mixes two unrelated ideas in a way that makes it hard to understand:

After initialization, Python programs can modify :data:sys.path. The
directory containing the script being run is placed at the beginning of the
search path, ahead of the standard library path. This means that scripts in that
directory will be loaded instead of modules of the same name in the library
directory. This is an error unless the replacement is intended. See section
:ref:tut-standardmodules for more information.

The first sentence describes the fact that Python programs can modify sys.path manually after initialization. The following sentences describe a separate and independent behavior: the directory of the executed script is automatically placed at the beginning of the module search path, which may cause shadowing of library modules with the same name.

These two behaviors are not logically connected yet are presented within a single paragraph without any transition. This may lead readers to incorrectly assume a relationship between manual modification of sys.path and the automatic placement of the script directory.

Suggested improvement

Split this paragraph into two separate paragraphs, or add an explicit transition indicating that these are independent aspects of module lookup behavior. This would improve clarity and reduce potential confusion for readers.

It may also be worth briefly noting (in a separate sentence) that manually modifying sys.path can sometimes be useful, but may also lead to import-related issues if misused.

Linked PRs

• gh-141935

从 Python Tutorial 的“The Module Search Path”部分开始，检查关于 sys.path 的段落。先查看链接的 PR gh-141935，然后确认手动和自动路径行为已分开或得到明确区分，同时确保完成后的教程文本能够提高清晰度，而不会引入缺乏依据的说法。