warning is raised when running the Flask application on non-Windows platforms

[saksham-gera]

SyntaxWarning: invalid escape sequence '\l'
proc = subprocess.check_output(["..\library", library_path, filename], shell=True, cwd=dir_path)

Steps to Reproduce
1. Run the Flask application on macOS/Linux.
2. Observe the SyntaxWarning in the logs when the app initializes.

Expected Behavior
• No warnings are raised.
• Path handling is platform-agnostic and does not produce errors or warnings on non-Windows platforms.

Environment
• OS: macOS/Linux
• Python Version: 3.8+
• Flask Version: 2.x

[saksham-gera]

Hi @pradeeban ,

I noticed this issue and would like to take it up if that’s okay with you. Let me know if I can proceed with resolving it!

Thanks! 😊

[pradeeban]

@saksham-gera sure, go for it.

[pradeeban]

Thanks for the fix.