Python3 Argparse optional positional argument
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Title: Python 3 Argparse Tutorial: Optional Positional Arguments
Introduction:
Argparse is a powerful module in Python that helps in parsing command-line arguments. While argparse primarily deals with optional and required arguments, there might be cases where you want a positional argument to be optional. In this tutorial, we'll explore how to implement optional positional arguments using Python 3's argparse module with code examples.
Firstly, you need to import the argparse module:
Create an ArgumentParser object, which will hold all the information necessary to parse the command-line arguments.
Add the required positional argument(s) and the optional positional argument using the add_argument method.
The input_file is a required positional argument, while output_file is an optional positional argument prefixed with --. Users can provide the output_file argument, but it's not mandatory.
Parse the command-line arguments using the parse_args() method.
Access the values of the parsed arguments using dot notation.
Here's a complete example script:
Save the script, for example, as optional_positional.py. Run it from the command line:
This will use input.txt as the input file and output.txt as the optional output file. If no --output_file is provided, the script will indicate that no output file is specified.
Now you have a complete understanding of implementing optional positional arguments using Python 3's argparse module.
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