Argparse: how to handle variable number of arguments (nargs='*')

In argparse, you can handle a variable number of arguments using the nargs='*' option. This option allows you to accept zero or more values for a single argument. Here's how you can use it:

import argparse # Create an ArgumentParser object parser = argparse.ArgumentParser(description="Example script with variable number of arguments") # Add an argument with nargs='*' parser.add_argument('values', nargs='*', help="A list of values (zero or more)") # Parse the command-line arguments args = parser.parse_args() # Access the values as a list values = args.values # Print the values print("Values:", values) 

In this example, we define an argument called 'values' with nargs='*'. This means that when you run your script, you can provide zero or more values as arguments. The provided values will be collected into a list and stored in the args.values attribute.

Here are some examples of how you can use this script:

1. Running the script with no arguments:

   python script.py 

   Output:

   Values: [] 

2. Running the script with one or more arguments:

   python script.py value1 value2 value3 

   Output:

   Values: ['value1', 'value2', 'value3'] 

You can access the collected values in the args.values list and process them as needed in your script.

Examples

1. How to use argparse to handle a variable number of arguments in Python? Description: Explains how to use the nargs='*' parameter in argparse to handle a variable number of positional arguments provided by the user.

   import argparse # Create the parser parser = argparse.ArgumentParser() # Add a positional argument with variable number of inputs parser.add_argument('inputs', nargs='*', help='Input files') # Parse the arguments args = parser.parse_args() # Access the variable number of inputs input_files = args.inputs 

2. How to handle multiple input filenames with argparse in Python? Description: Demonstrates how to use argparse to handle multiple input filenames provided by the user, allowing for a variable number of inputs.

   import argparse # Create the parser parser = argparse.ArgumentParser() # Add positional arguments for input filenames parser.add_argument('filenames', nargs='*', help='Input filenames') # Parse the arguments args = parser.parse_args() # Access the list of input filenames input_filenames = args.filenames 

3. Argparse: How to parse variable number of command-line arguments in Python? Description: Shows how to parse a variable number of command-line arguments using argparse in Python by specifying nargs='*'.

   import argparse # Create the parser parser = argparse.ArgumentParser() # Add positional arguments with variable number of inputs parser.add_argument('arguments', nargs='*', help='Variable number of arguments') # Parse the arguments args = parser.parse_args() # Access the variable number of arguments input_arguments = args.arguments 

4. How to handle multiple input values with argparse in Python? Description: Illustrates how to use argparse to handle multiple input values provided by the user, where the number of inputs can vary.

   import argparse # Create the parser parser = argparse.ArgumentParser() # Add positional arguments for multiple inputs parser.add_argument('values', nargs='*', help='Input values') # Parse the arguments args = parser.parse_args() # Access the list of input values input_values = args.values 

5. Argparse: Handle variable number of arguments with Python's argparse? Description: Provides a solution to handle a variable number of arguments using argparse in Python, allowing users to specify any number of inputs.

   import argparse # Create the parser parser = argparse.ArgumentParser() # Add positional arguments with variable number of inputs parser.add_argument('args', nargs='*', help='Variable number of arguments') # Parse the arguments args = parser.parse_args() # Access the variable number of arguments input_args = args.args 

6. How to use argparse to accept multiple values as input in Python? Description: Explains how to configure argparse to accept multiple values as input, supporting a variable number of inputs specified by the user.

   import argparse # Create the parser parser = argparse.ArgumentParser() # Add positional arguments for multiple values parser.add_argument('values', nargs='*', help='Input values') # Parse the arguments args = parser.parse_args() # Access the list of input values input_values = args.values 

7. Argparse: Handle a list of values with variable length in Python? Description: Demonstrates how to handle a list of values with variable length using argparse in Python by utilizing nargs='*'.

   import argparse # Create the parser parser = argparse.ArgumentParser() # Add positional arguments with variable number of inputs parser.add_argument('values', nargs='*', help='Variable length list of values') # Parse the arguments args = parser.parse_args() # Access the variable length list of values input_values = args.values 

8. How to handle variable number of arguments with argparse in Python scripts? Description: Provides guidance on handling a variable number of arguments using argparse in Python scripts, enabling users to specify any number of inputs.

   import argparse # Create the parser parser = argparse.ArgumentParser() # Add positional arguments with variable number of inputs parser.add_argument('args', nargs='*', help='Variable number of arguments') # Parse the arguments args = parser.parse_args() # Access the variable number of arguments input_args = args.args 

9. Argparse: Accept multiple inputs with varying lengths in Python? Description: Shows how to configure argparse to accept multiple inputs with varying lengths in Python scripts, utilizing the nargs='*' parameter.

   import argparse # Create the parser parser = argparse.ArgumentParser() # Add positional arguments for multiple inputs with varying lengths parser.add_argument('inputs', nargs='*', help='Input values') # Parse the arguments args = parser.parse_args() # Access the list of input values input_values = args.inputs 

10. How to parse variable number of arguments with argparse in Python? Description: Provides a method to parse a variable number of arguments using argparse in Python, allowing users to provide any number of inputs.

    import argparse # Create the parser parser = argparse.ArgumentParser() # Add positional arguments with variable number of inputs parser.add_argument('args', nargs='*', help='Variable number of arguments') # Parse the arguments args = parser.parse_args() # Access the variable number of arguments input_args = args.args 

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