Python: Reading all files in all directories

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How do I list all files of a directory? 31 answers

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Python doesn't support wildcards directly in filenames to the open() call. You'll need to use the glob module instead to load files from a single level of subdirectories, or use os.walk() to walk an arbitrary directory structure.

Opening all text files in all subdirectories, one level deep:

import glob

for filename in glob.iglob(os.path.join('Test', '*', '*.txt')):
    with open(filename) as f:
        # one file open, handle it, next loop will present you with a new file.

Opening all text files in an arbitrary nesting of directories:

import os
import fnmatch

for dirpath, dirs, files in os.walk('Test'):
    for filename in fnmatch.filter(files, '*.txt'):
        with open(os.path.join(dirpath, filename)):
            # one file open, handle it, next loop will present you with a new file.

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