Exam2022 Flashcards
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python script.py input.txt output.txt –verbose
The argparse module in Python provides a way to handle command-line arguments passed to a script. It allows you to define what arguments your program requires, parse those arguments, and automatically generate help and usage messages.
Here’s an example of how to use argparse:
import argparse
Create the parser
parser = argparse.ArgumentParser(description="Example script using argparse")
Add arguments
parser.add_argument('input', type=str, help='Input file path')
parser.add_argument('output', type=str, help='Output file path')
parser.add_argument('--verbose', action='store_true', help='Increase output verbosity')
Parse the arguments
args = parser.parse_args()
Use the arguments
print(f"Input file: {args.input}")
print(f"Output file: {args.output}")
if args.verbose:
print("Verbose mode is on")
Example usage
# python script.py input.txt output.txt --verbose
Explanation:
- Create the parser: argparse.ArgumentParser is used to create a new argument parser object.
- Add arguments: add_argument is used to specify which command-line options the program is expecting. In this example, input and output are positional arguments, and –verbose is an optional argument.
- Parse the arguments: parse_args parses the command-line arguments and returns them as an object with attributes.
- Use the arguments: The parsed arguments can be accessed as attributes of the args object.
When you run the script with the command:
python script.py input.txt output.txt --verbose
The output will be:
Input file: input.txt Output file: output.txt Verbose mode is on
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