[ Python 常見問題 ] How to use glob() to find files recursively?

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Question
This is what I have:

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1. glob(os.path.join('src','*.c'))  

but I want to search the subfolders of src. Something like this would work:

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1. glob(os.path.join('src','*.c'))  
2. glob(os.path.join('src','*','*.c'))  
3. glob(os.path.join('src','*','*','*.c'))  
4. glob(os.path.join('src','*','*','*','*.c'))  

But this is obviously limited and clunky.

HowTo
Use pathlib.Path.rglob from the the pathlib module, which was introduced in Python 3.5.

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1. from pathlib import Path  
2.   
3. for path in Path('src').rglob('*.c'):  
4.     print(path.name)  

If you don't want to use pathlib, use can use glob.glob('**/*.c'), but don't forget to pass in the recursive keyword parameter and it will use inordinate amount of time on large directories.

For cases where matching files beginning with a dot (.); like files in the current directory or hidden files on Unix based system, use the os.walk solution below. For older Python versions, use os.walk to recursively walk a directory and fnmatch.filter to match against a simple expression:

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1. import fnmatch  
2. import os  
3.   
4. matches = []  
5. for root, dirnames, filenames in os.walk('src'):  
6.     for filename in fnmatch.filter(filenames, '*.c'):  
7.         matches.append(os.path.join(root, filename))