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Easily parse known arguments with Python’s ArgumentParser.parse_known_args method.

# Python ArgumentParser.parse_known_args Usage

## Introduction
The `ArgumentParser` class in Python’s `argparse` module provides a way to easily parse command-line arguments. One useful method in this class is `parse_known_args`, which parses only known arguments and returns a tuple of two values: a Namespace containing the known arguments and a list of strings containing unknown arguments.

## Syntax
“`python
known_args, unknown_args = parser.parse_known_args()
“`

## Parameters
– `parser`: The ArgumentParser object that you have created.

## Example
“`python
import argparse

# Create ArgumentParser object
parser = argparse.ArgumentParser()

# Add arguments
parser.add_argument(‘–verbose’, action=’store_true’, help=’Increase output verbosity’)
parser.add_argument(‘input_file’, type=str, help=’Input file path’)

# Parse known arguments
known_args, unknown_args = parser.parse_known_args()

# Print known arguments
print(‘Known arguments:’, known_args)

# Print unknown arguments
print(‘Unknown arguments:’, unknown_args)
“`

## Explanation
In the above example, we first create an ArgumentParser object `parser` and add two arguments: `–verbose` and `input_file`. We then call `parse_known_args` method on the parser object, which parses the known arguments (`–verbose` and `input_file`) and returns a tuple of `known_args` and `unknown_args`. We print the known and unknown arguments to see the output.

## Use Cases
The `parse_known_args` method can be useful in scenarios where you want to parse only known arguments and handle unknown arguments separately. This can be helpful when you have a mix of known and unknown arguments and need to process them differently.

## Conclusion
In conclusion, the `parse_known_args` method in Python’s ArgumentParser class is a handy tool for parsing only known arguments from the command line. By using this method, you can easily separate known and unknown arguments and handle them accordingly in your Python scripts.