The cmdparser module is a third-party library designed for command-line parsing. It extends the functionality of the built-in argparse module, offering additional features such as subcommands and more flexible argument parsing. Below are details on how to use cmdparser for command-line argument parsing.
1. Installation
First, you need to install the cmdparser module if it’s not already installed. You can do this using pip:
pip install cmdparser
2. Basic Usage
Here is an example demonstrating how to use cmdparser for parsing command-line arguments:
import cmdparser
# Create a parser object
parser = cmdparser.CmdParser()
# Define a command with arguments
parser.add_command('greet', 'Greet someone', {
'name': {'help': 'Name of the person to greet', 'required': True},
'age': {'help': 'Age of the person', 'type': int}
})
# Parse the arguments
args = parser.parse_args()
# Access arguments
if args.command == 'greet':
print(f"Hello, {args.name}! You are {args.age} years old.")
3. Adding Subcommands
One of the features of cmdparser is handling subcommands. You can define multiple commands and their respective arguments:
import cmdparser
# Create a parser object
parser = cmdparser.CmdParser()
# Define the main command
parser.add_command('main', 'Main command', {
'option': {'help': 'An option for the main command'}
})
# Define a subcommand
parser.add_command('sub', 'Subcommand', {
'sub_option': {'help': 'An option for the subcommand'}
}, parent='main')
# Parse the arguments
args = parser.parse_args()
# Access arguments
if args.command == 'main':
print(f"Main command option: {args.option}")
elif args.command == 'sub':
print(f"Subcommand option: {args.sub_option}")
4. Conclusion
The cmdparser module offers an extended and flexible way to handle command-line arguments, including support for subcommands. It is useful for creating complex command-line interfaces with ease. For simpler needs, the built-in argparse module may suffice, but cmdparser provides additional functionality for more advanced use cases.
