- 1 year ago
Python argparse fails when the script run without preceding py -2 or -3
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If you're experiencing issues with argparse
when running a Python script without preceding it with python
, python2
, or python3
, it may be related to the file association or shebang line in your script. Here are a couple of things you can check:
File Association:
- Ensure that the
.py
file extension is associated with the correct version of Python on your system. - To check the file association on Windows, open a command prompt and run:
The output should be something likebashassoc .py
.py=Python.File
. - To check the associated command for the file type, run:
The output should include the path to the Python executable, such asbashftype Python.File
"C:\path\to\python.exe" "%1" %*
. - If the file association is incorrect or missing, you can set it using the
assoc
andftype
commands. For example, to associate.py
files with Python 3 on Windows, you can run:bashassoc .py=Python.File
ftype Python.File="C:\path\to\python.exe" "%1" %*
- Ensure that the
Shebang Line:
- Ensure that your script has the correct shebang line at the beginning, specifying the desired Python interpreter version.
- For Python 2:python
#!/usr/bin/env python2
- For Python 3:python
#!/usr/bin/env python3
- Make sure the shebang line is the very first line of your script, with no leading spaces or comments before it.
By verifying the file association and shebang line, you can ensure that the correct version of Python is used when executing the script without explicitly specifying python
, python2
, or python3
. This should resolve any issues with argparse
failing when running the script directly.