Python Cmd Module Multi line input

Published: 16 November 2023
on channel: CodeLines

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The cmd module in Python provides a simple framework for building line-oriented command interpreters. In this tutorial, we will explore how to handle multi-line input using the cmd module. This can be useful when you want to accept input that spans multiple lines, such as writing a command-line interface for a custom application or script.
To start, let's create a simple command-line interpreter using the cmd module. Save the following code in a Python file, e.g., multiline_cmd.py:
This script defines a basic cmd.Cmd subclass named MultiLineCmd. It sets up a custom prompt and an introduction message. The default method is called for any input that doesn't match a specific command.
To handle multi-line input, we need to override the cmdloop method. We'll modify it to keep reading lines until a specific termination command is encountered. Update the MultiLineCmd class as follows:
Now, the cmdloop method has been modified to enter a multi-line mode, and it will continue reading input until the user types 'end' on a new line. The postcmd method is called after each command, and it checks if the line is 'end' to terminate the loop.
Save the updated script and run it. You should see the new behavior:
In the example above, the input spans multiple lines until the user types 'end' on a new line.
The cmd module provides a straightforward way to create command-line interfaces, and with a few modifications, you can enable multi-line input. This is particularly useful for scenarios where users need to input complex or lengthy commands.
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