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Ensure only one option is selected with `add_mutually_exclusive_group` in Python’s argparse module.

# Using `ArgumentParser.add_mutually_exclusive_group` in Python

In Python, the `ArgumentParser` class from the `argparse` module provides a way to easily parse command-line arguments. One useful feature it offers is the ability to create mutually exclusive groups of arguments using the `add_mutually_exclusive_group` method. This can be helpful when you want to ensure that only one option from a group of arguments is provided by the user.

Here’s how you can use `add_mutually_exclusive_group` in Python:

“`python
import argparse

# Create an ArgumentParser object
parser = argparse.ArgumentParser(description=’Description of your program’)

# Create a mutually exclusive group
group = parser.add_mutually_exclusive_group()

# Add arguments to the group
group.add_argument(‘–option1′, help=’Description of option 1’)
group.add_argument(‘–option2′, help=’Description of option 2’)

# Parse the command-line arguments
args = parser.parse_args()

# Access the selected option
if args.option1:
print(‘Option 1 selected’)
elif args.option2:
print(‘Option 2 selected’)
else:
print(‘No option selected’)
“`

In this example, we first import the `argparse` module and create an `ArgumentParser` object called `parser`. We then create a mutually exclusive group using the `add_mutually_exclusive_group` method and add two arguments (`–option1` and `–option2`) to this group using the `add_argument` method.

When we parse the command-line arguments using `parser.parse_args()`, only one of the mutually exclusive arguments can be selected by the user. We can then check which option was selected by accessing the corresponding attribute in the `args` namespace.

Using mutually exclusive groups can help make your command-line interface more user-friendly and prevent users from providing conflicting arguments. It also makes the code more readable by clearly indicating which options are mutually exclusive.

Overall, `ArgumentParser.add_mutually_exclusive_group` is a useful feature in Python’s `argparse` module that can help you create more robust and intuitive command-line interfaces for your programs.