Python argparse使用问题：命令行传入路径后参数无法识别报错

Hey there! Let's break down why you're getting that "unrecognized arguments" error and fix your script step by step.

What's Causing the Error? #

Your error message tells us that argparse doesn't recognize the ../seek path you're passing. This usually happens for one of two reasons:

• You didn't define a positional argument for the directory path in your argparse setup (maybe you used an optional --path flag but forgot to include it in your command).
• Your -name flag is configured as a boolean (on/off) option instead of one that accepts a regex value, so argparse thinks the [a-z]*\.txt part is an unknown argument.

Correct Argparse Setup #

Here's a working version of your script that addresses both issues:

import argparse
import os
import re

def find_matching_files(directory, regex_pattern):
    # Compile the regex for efficiency
    pattern = re.compile(regex_pattern)
    # Walk through the directory and subdirectories
    for root, _, filenames in os.walk(directory):
        for filename in filenames:
            if pattern.match(filename):
                print(os.path.join(root, filename))

if __name__ == "__main__":
    # Set up the argument parser
    parser = argparse.ArgumentParser(description="Search for files matching a regex in a directory")
    
    # Add positional argument for the directory path (required)
    parser.add_argument("path", help="Directory to search through")
    
    # Add -name flag that accepts a regex value (required)
    parser.add_argument("-name", required=True, help="Regex pattern to match filenames")
    
    # Parse the command line arguments
    args = parser.parse_args()
    
    # Run the search function
    find_matching_files(args.path, args.name)

How to Use the Script #

Run your command exactly as you tried before (the quotes are critical to prevent your shell from expanding the regex before it reaches Python):

./find.py ../seek -name '[a-z]*\.txt'

Key Fixes Explained #

• Positional path argument: This tells argparse to expect the directory path as the first input, no flag needed.
• -name with a value: By omitting action='store_true', argparse knows -name needs to be followed by your regex pattern.
• Quoting the regex: The single quotes around [a-z]*\.txt stop your shell from trying to expand the wildcard before passing it to your script—this ensures the regex is handled by Python's re library instead.

内容的提问来源于stack exchange，提问作者ajax