How Do I Access and Process Command Line Arguments in Python?

Processing Command Line Arguments in Python

In Python, the command line arguments are available in a list called sys.argv. To access these arguments, use the following syntax:

import sys

# Print all command line arguments
print("\n".join(sys.argv))

# Print all arguments except the script name
print(sys.argv[1:])

Explanation:

• sys.argv is a list containing all the arguments passed to the script on the command line.
• sys.argv[0] is the script name.
• sys.argv[1:] contains all the arguments except the script name. This is useful for processing arguments that the script is expected to handle.

Example:

Let's say we have a script called my_script.py that takes a filename as an argument. We can process this argument using the following code:

import sys

if len(sys.argv) < 2:
    print("Usage: my_script.py <filename>")
    exit()

filename = sys.argv[1]

# Do something with the filename

This code checks if the user has provided a filename and exits gracefully if not. Otherwise, it assigns the filename to a variable for further processing.

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