python argparse check if argument exists

Title: Checking if an Argument Exists using Python Argparse
Introduction:
Argparse is a powerful Python module that facilitates command-line argument parsing. It allows developers to define arguments, parse them, and handle them in a structured manner. In this tutorial, we'll focus on checking if a specific argument exists using argparse.
Prerequisites:
Step 1: Import the argparse module
Step 2: Create an ArgumentParser object
Step 3: Add arguments to the parser
In this example, we added two optional arguments, '--input' and '--output'.
Step 4: Parse the command-line arguments
This line parses the command-line arguments and stores the values in the 'args' variable.
Step 5: Check if a specific argument exists
In this example, we use the hasattr function to check if the 'input' attribute exists in the 'args' object. If it exists, we print the provided input value; otherwise, we print a message indicating that the input argument was not provided.
Step 6: Run the script with command-line arguments
Save your script and run it from the command line, providing values for the '--input' and '--output' arguments if needed.
Example:
Conclusion:
By following these steps, you can easily check if a specific argument exists using the argparse module in Python. This is useful for handling different scenarios based on whether certain command-line arguments are provided or not.
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