不通过Python命令运行Python脚本失败，寻求技术解决方案

Hey there, let's work through this frustrating issue you're facing—running your Python script without prepending python isn't working, even after trying shebang lines and adjusting permissions. Let's break down the possible fixes step by step:

1. Fix Windows-style line endings messing up the shebang #

A super common culprit here is if your script was created/edited on Windows, which uses \r\n line endings instead of Unix's \n. The shebang line gets misinterpreted as #!/usr/bin/env python\r, and the system can't find a file named python\r—that's exactly why you see "No such file or directory".

To resolve this:

• First, confirm the line endings with:

  file script.py
  

  If you see "ASCII text, with CRLF line terminators", that's the problem.
• Convert the file to Unix line endings using:

  dos2unix script.py
  

  If dos2unix isn't installed, use sed as an alternative:

  sed -i 's/\r$//' script.py
  

2. Verify the Python path in your shebang is valid #

When you tried #!/usr/bin/python2.7 -B, make sure that path actually exists on your system. Run this to check:

which python2.7

If it returns a different path (like /usr/local/bin/python2.7), update your shebang to match that exact location. If which python2.7 returns nothing, you might not have Python 2.7 installed at all—double-check with python2.7 --version.

For the #!/usr/bin/env python shebang, confirm python points to a valid interpreter:

which python

If this returns nothing, you'll need to add Python's directory to your PATH environment variable.

3. Check for a UTF-8 BOM interfering with the shebang #

Sometimes, saving the script with a UTF-8 Byte Order Mark (BOM) adds an invisible character at the start, breaking the shebang line.

To check for this:

cat -v script.py | head -1

If you see a weird character (like ^M) before the shebang, remove the BOM. In Vim, you can do this with:

:set nobomb
:w

Most modern text editors also have an option to save files without a BOM.

4. If using WSL or cross-filesystem setups #

If you're running the script from a Windows filesystem (like /mnt/c in WSL), execution permissions might not be honored even after running chmod +x. Try copying the script to a native Linux directory (like ~/scripts) and running it from there.

Give these steps a shot—one of them should get your script running without needing to type python every time!

内容的提问来源于stack exchange，提问作者user3819295