Why Do I Get a FileNotFoundError When Using os.listdir in Python?

FileNotFoundError for File Names Returned by os.listdir

In Python, when iterating through files in a directory using os.listdir, you may encounter FileNotFoundError despite the file's existence.

Cause:

os.listdir returns only the filename (e.g., 'foo.txt'), not the full path (e.g., 'E:/somedir/foo.txt'). When opening the file, the complete path is required.

Solution:

Prepend the directory path to the filename using os.path.join:

import os

path = r'E:/somedir'

for filename in os.listdir(path):
    with open(os.path.join(path, filename)) as f:
        ... # process the file

Additionally, using the with block ensures that the file is closed automatically.

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