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How to Handle Command-Line Arguments in Windows When Executing Python Scripts?
Published on 2024-11-15
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Python Script Execution in Windows: Understanding Argument Handling
In Windows, executing Python scripts without specifying "python" in the command can lead to unexpected behavior. This issue stems from the way Windows associates file types with executables.
When a script is executed without "python," Windows invokes the associated EXE based on the file extension. For Python, the associated EXE is typically "python.exe." However, this execution differs from explicitly calling "python" in the command.
By default, "python.exe" will execute a script with the following command:
"c:\python26\python.exe" "blah.py" foo
This command preserves the arguments provided after the script path. However, if Windows is not correctly configured, these arguments may not be accessible to the script.
Troubleshooting
To resolve the argument handling issue, check the following settings:
- File Type Association: Ensure that ".py" files are correctly associated with "Python.File" and opened with "python.exe." Check this using the commands:
assoc .py ftype Python.File
- Registry Settings: Adjust the registry key:
HKEY_CLASSES_ROOT\Applications\python26.exe\shell\open\command
and set it to:
"C:\Python26\python26.exe" "%1" %*
Similarly, set:
HKEY_CLASSES_ROOT\py_auto_file\shell\open\command
to the same value. This ensures that Windows correctly passes arguments to Python scripts.
By following these troubleshooting steps, you can ensure that Python scripts are executed properly in Windows, including the handling of command-line arguments.
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