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

從 Python Tutorial 的「The Module Search Path」章節開始，檢視關於 sys.path 的段落。先確認連結的 PR gh-141935，接著確認手動與自動路徑行為已分開或明確區分，同時確保完成後的教學文字能提升清晰度，而不引入缺乏依據的說法。