How to pass a list as a command-line argument with argparse?

How to pass a list as a command-line argument with argparse?

You can pass a list as a command-line argument using the argparse module in Python. To do this, you can use a custom action to parse the input string and convert it into a list. Here's an example of how to achieve this:

import argparse # Create the argument parser parser = argparse.ArgumentParser(description="Example of passing a list as a command-line argument") # Define a custom action to parse a comma-separated list class ParseListAction(argparse.Action): def __call__(self, parser, namespace, values, option_string=None): # Split the input string by commas and store the result as a list setattr(namespace, self.dest, values.split(',')) # Add an argument that accepts a list parser.add_argument('--mylist', action=ParseListAction, help='A list of items separated by commas') # Parse the command-line arguments args = parser.parse_args() # Access the list in your code if args.mylist: print("List:", args.mylist) else: print("No list provided.")

In this example:

  1. We create an argument parser using argparse.

  2. We define a custom action called ParseListAction that splits the input string by commas and stores the result as a list.

  3. We add an argument --mylist that uses the custom action to parse the list.

  4. We parse the command-line arguments using parser.parse_args().

Now, you can run your Python script with a list provided as a command-line argument:

python script.py --mylist item1,item2,item3

The script will parse the input string and store it as a list in the args.mylist attribute, which you can then access in your code.

Examples

  1. "Python argparse pass list as command line argument example"

    Description: Learn how to pass a list as a command-line argument using argparse in Python with this example.

    import argparse # Create ArgumentParser object parser = argparse.ArgumentParser(description='Process some integers.') # Add argument to accept list of integers parser.add_argument('integers', metavar='N', type=int, nargs='+', help='an integer for the accumulator') # Parse command-line arguments args = parser.parse_args() # Access the list of integers provided print("List of integers:", args.integers)

  2. "Python argparse accept list as command line argument"

    Description: Understand how to use argparse in Python to accept a list as a command-line argument with this code snippet.

    import argparse # Create ArgumentParser object parser = argparse.ArgumentParser(description='Process a list of numbers.') # Add argument to accept list of floats parser.add_argument('--numbers', nargs='+', type=float, help='a list of floating-point numbers') # Parse command-line arguments args = parser.parse_args() # Access the list of numbers provided print("List of numbers:", args.numbers)

  3. "Python argparse pass list argument from command line"

    Description: Delve into passing a list argument from the command line using argparse in Python with this code example.

    import argparse # Create ArgumentParser object parser = argparse.ArgumentParser(description='Process a list of strings.') # Add argument to accept list of strings parser.add_argument('--strings', nargs='+', help='a list of strings') # Parse command-line arguments args = parser.parse_args() # Access the list of strings provided print("List of strings:", args.strings)

  4. "Python argparse pass list as argument"

    Description: Explore how to pass a list as an argument using argparse in Python through this code snippet.

    import argparse # Create ArgumentParser object parser = argparse.ArgumentParser(description='Process a list of items.') # Add argument to accept list of items parser.add_argument('--items', nargs='+', help='a list of items') # Parse command-line arguments args = parser.parse_args() # Access the list of items provided print("List of items:", args.items)

  5. "Python argparse accept list from command line"

    Description: Learn how to accept a list from the command line using argparse in Python with this practical code example.

    import argparse # Create ArgumentParser object parser = argparse.ArgumentParser(description='Process a list of values.') # Add argument to accept list of values parser.add_argument('--values', nargs='+', type=int, help='a list of integer values') # Parse command-line arguments args = parser.parse_args() # Access the list of values provided print("List of values:", args.values)

  6. "Python argparse pass list as command line argument"

    Description: Gain insights into passing a list as a command-line argument using argparse in Python with this code demonstration.

    import argparse # Create ArgumentParser object parser = argparse.ArgumentParser(description='Process a list of elements.') # Add argument to accept list of elements parser.add_argument('--elements', nargs='+', help='a list of elements') # Parse command-line arguments args = parser.parse_args() # Access the list of elements provided print("List of elements:", args.elements)

  7. "Python argparse pass list argument example"

    Description: Explore an example of passing a list as an argument using argparse in Python with this code snippet.

    import argparse # Create ArgumentParser object parser = argparse.ArgumentParser(description='Process a list of items.') # Add argument to accept list of items parser.add_argument('--items', nargs='+', help='a list of items') # Parse command-line arguments args = parser.parse_args() # Access the list of items provided print("List of items:", args.items)

  8. "Python argparse pass list from command line example"

    Description: Delve into passing a list from the command line using argparse in Python with this practical code example.

    import argparse # Create ArgumentParser object parser = argparse.ArgumentParser(description='Process a list of values.') # Add argument to accept list of values parser.add_argument('--values', nargs='+', type=int, help='a list of integer values') # Parse command-line arguments args = parser.parse_args() # Access the list of values provided print("List of values:", args.values)

  9. "Python argparse pass list argument from command line example"

    Description: Understand how to pass a list argument from the command line using argparse in Python with this code example.

    import argparse # Create ArgumentParser object parser = argparse.ArgumentParser(description='Process a list of strings.') # Add argument to accept list of strings parser.add_argument('--strings', nargs='+', help='a list of strings') # Parse command-line arguments args = parser.parse_args() # Access the list of strings provided print("List of strings:", args.strings)

  10. "Python argparse pass list as command line argument from terminal"

    Description: Learn how to pass a list as a command-line argument from the terminal using argparse in Python with this code snippet.

    import argparse # Create ArgumentParser object parser = argparse.ArgumentParser(description='Process a list of elements.') # Add argument to accept list of elements parser.add_argument('--elements', nargs='+', help='a list of elements') # Parse command-line arguments args = parser.parse_args() # Access the list of elements provided print("List of elements:", args.elements)

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