Open() on path that exceeds 248 char limit results in "FileNotFoundError: [Errno 2] No such file or directory"

Bug report

Attempting to open or appending paths to sys.path with paths that length exceed the 248 character limit results in incorrect errors. In the case of opening paths that exceeded the limit, rather than an error pointing to the path length being exceeded we see a file not found. A similar error handling issue is prevalent with appending paths that exceed the limit to sys.path. In this case when trying to access the module you will receive a module not found error. I am now aware the path limit can be disabled on installation or later but these false flags led me astray while debugging.

Reproduction Steps:

• Create a text file whose path exceeds 248 characters
• Attempt to read/write from that file
  or
• Create a Python module whose path exceeds 248 characters
• Attempt to import that module from an external directory by appending the path to sys.path

Environment

• CPython versions tested on: 3.10.4
• Operating system and architecture: Windows x64

首先在 Windows x64 與 Python 3.10.4 上重現回報的行為：開啟路徑超過 248 個字元的檔案，然後測試從附加至 sys.path 的過長路徑匯入模組。追蹤開啟與匯入失敗，以找出長度條件在哪個環節遺失。完成的標準是兩種情況都回報準確的路徑長度錯誤，而不是 FileNotFoundError 或 ModuleNotFoundError。