How to require my python script's argument to be a float in a range using argparse?

How to require my python script's argument to be a float in a range using argparse?

You can use the argparse module in Python to require that a command-line argument for your script is a float within a specific range. You can achieve this by defining a custom argument type and a custom validation function. Here's how you can do it:

import argparse # Define a custom argument type and validation function def valid_float_in_range(value): try: float_value = float(value) if 0.0 <= float_value <= 1.0: # Replace 0.0 and 1.0 with your desired range return float_value else: raise argparse.ArgumentTypeError( f"Value must be a float in the range [0.0, 1.0], but got {value}" ) except ValueError: raise argparse.ArgumentTypeError(f"Invalid float: {value}") # Create the argument parser parser = argparse.ArgumentParser(description="A script that requires a float in a specific range.") # Add an argument with the custom validation parser.add_argument( "float_arg", type=valid_float_in_range, help="A float argument in the range [0.0, 1.0]", ) # Parse the command-line arguments args = parser.parse_args() # Access the validated float argument float_value = args.float_arg # Use the validated float_value in your script print(f"Validated float value: {float_value}")

In this example:

  1. We define a custom argument type called valid_float_in_range, which checks if the input value is a valid float within the specified range.

  2. We create an argument parser using argparse.

  3. We add an argument using parser.add_argument and specify the custom validation function as the type argument.

  4. The script will raise an error if the provided argument is not a float within the specified range.

Replace the range [0.0, 1.0] with your desired range. When you run your script, the argument will be required to be a float within that range, and the script will validate and use the argument accordingly.

Examples

  1. "Python argparse float range" Description: This query seeks information on how to use Python's argparse module to require a script's argument to be a float within a specified range. Code:

    import argparse parser = argparse.ArgumentParser() parser.add_argument('--value', type=float, help='Enter a float value within the range [0.0, 1.0]') args = parser.parse_args() if args.value is not None and not 0.0 <= args.value <= 1.0: parser.error("Value must be a float within the range [0.0, 1.0]")

  2. "Python argparse float argument range validation" Description: This query is interested in how to validate a float argument's range using argparse in Python scripts. Code:

    import argparse def float_range(value): fvalue = float(value) if not 0.0 <= fvalue <= 1.0: raise argparse.ArgumentTypeError("Value must be a float within the range [0.0, 1.0]") return fvalue parser = argparse.ArgumentParser() parser.add_argument('--value', type=float_range, help='Enter a float value within the range [0.0, 1.0]') args = parser.parse_args()

  3. "Python argparse float argument between 0 and 1" Description: This query focuses on how to ensure that a float argument provided via argparse falls within the range of 0 to 1. Code:

    import argparse parser = argparse.ArgumentParser() parser.add_argument('--value', type=float, help='Enter a float value between 0 and 1') args = parser.parse_args() if args.value is not None and not 0.0 <= args.value <= 1.0: parser.error("Value must be a float between 0 and 1")

  4. "Python argparse float range constraint" Description: This query may be seeking methods to apply constraints on float arguments within a specific range using argparse. Code:

    import argparse parser = argparse.ArgumentParser() parser.add_argument('--value', type=float, help='Enter a float value within the range [0.0, 1.0]') args = parser.parse_args() if args.value is not None and not 0.0 <= args.value <= 1.0: parser.error("Value must be a float within the range [0.0, 1.0]")

  5. "Python argparse float input validation" Description: This query is interested in how to validate float inputs within a specified range using argparse in Python. Code:

    import argparse def float_range(value): fvalue = float(value) if not 0.0 <= fvalue <= 1.0: raise argparse.ArgumentTypeError("Value must be a float within the range [0.0, 1.0]") return fvalue parser = argparse.ArgumentParser() parser.add_argument('--value', type=float_range, help='Enter a float value within the range [0.0, 1.0]') args = parser.parse_args()

  6. "Python argparse validate float argument" Description: This query seeks information on how to perform validation on float arguments provided via argparse in Python scripts. Code:

    import argparse parser = argparse.ArgumentParser() parser.add_argument('--value', type=float, help='Enter a float value within the range [0.0, 1.0]') args = parser.parse_args() if args.value is not None and not 0.0 <= args.value <= 1.0: parser.error("Value must be a float within the range [0.0, 1.0]")

  7. "Python argparse float range check" Description: This query focuses on how to check if a float argument provided via argparse falls within a specific range in Python. Code:

    import argparse parser = argparse.ArgumentParser() parser.add_argument('--value', type=float, help='Enter a float value within the range [0.0, 1.0]') args = parser.parse_args() if args.value is not None and not 0.0 <= args.value <= 1.0: parser.error("Value must be a float within the range [0.0, 1.0]")

  8. "Python argparse float input range" Description: This query may be seeking information on how to handle float inputs within a specific range using argparse in Python scripts. Code:

    import argparse parser = argparse.ArgumentParser() parser.add_argument('--value', type=float, help='Enter a float value within the range [0.0, 1.0]') args = parser.parse_args() if args.value is not None and not 0.0 <= args.value <= 1.0: parser.error("Value must be a float within the range [0.0, 1.0]")

  9. "Python argparse float argument between 0 and 1" Description: This query is interested in requiring a float argument provided via argparse to be between 0 and 1. Code:

    import argparse parser = argparse.ArgumentParser() parser.add_argument('--value', type=float, help='Enter a float value between 0 and 1') args = parser.parse_args() if args.value is not None and not 0.0 <= args.value <= 1.0: parser.error("Value must be a float between 0 and 1")

  10. "Python argparse float range constraint example" Description: This query seeks a practical example of using argparse to constrain float arguments within a specified range in Python. Code:

    import argparse parser = argparse.ArgumentParser() parser.add_argument('--value', type=float, help='Enter a float value within the range [0.0, 1.0]') args = parser.parse_args() if args.value is not None and not 0.0 <= args.value <= 1.0: parser.error("Value must be a float within the range [0.0, 1.0]")

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