How to use Argparse

To use argparse in Python for creating a program that asks for a filename and an output directory, you can follow these steps:

1. Import the argparse module:

import argparse

2. Create an instance of the argparse.ArgumentParser class:

parser = argparse.ArgumentParser(description='Process input file and output directory.')

3. Define the command-line arguments you want to accept:

parser.add_argument('filename', help='Input file name')
parser.add_argument('output_dir', help='Output directory')

4. Parse the command-line arguments:

args = parser.parse_args()

5. Access the values of the arguments entered by the user:

filename = args.filename
output_dir = args.output_dir

6. Use the obtained values in your program as needed.

Here's a complete example that puts it all together:

import argparse

def main():
    # Step 2: Create an ArgumentParser instance
    parser = argparse.ArgumentParser(description='Process input file and output directory.')
    
    # Step 3: Define command-line arguments
    parser.add_argument('filename', help='Input file name')
    parser.add_argument('output_dir', help='Output directory')
    
    # Step 4: Parse the command-line arguments
    args = parser.parse_args()
    
    # Step 5: Access the values of the arguments
    filename = args.filename
    output_dir = args.output_dir
    
    # Step 6: Use the obtained values
    print("Input file:", filename)
    print("Output directory:", output_dir)

if __name__ == '__main__':
    main()

To run this program from the command line, you would provide the filename and output directory as arguments. For example:

$ python your_program.py input_file.txt /path/to/output/

Make sure to replace "your_program.py" with the actual filename of your Python script, "input_file.txt" with the desired filename, and "/path/to/output/" with the desired output directory.

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