How do you read user input and command line arguments in Python?

Reading User Input and Command Line Arguments in Python

When developing Python scripts, it is often necessary for them to interact with users and receive their input. Additionally, command line arguments allow users to specify parameters when running the script.

Reading User Input:

To read input from a user, you can use the following methods:

• cmd module: Provides an easy way to create a mini-command line interpreter with help texts and autocompletion.
• raw_input (input in Python 3 ): Reads a line of text from the user.

# Python 2
text = raw_input("prompt")

# Python 3
text = input("prompt")

Reading Command Line Arguments:

Command line arguments are stored in sys.argv. To access them, use the following code:

import sys
print(sys.argv)

Parsing Command Line Options:

To parse command line options, you can use the following modules:

• argparse: The preferred module for parsing command line options.
• optparse (deprecated): An older module that is now deprecated.
• getopt: A basic module for parsing command line options.

Using fileinput for Input Files:

If you want to accept input files as command line arguments, you can use the fileinput module. This module provides a consistent way to loop over files.

For more information, refer to the Python library reference, which provides comprehensive documentation on these features.

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