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Files & data

Read and write files safely; parse JSON, CSV, and common text formats.

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Files & data easy

Build a File Index by Relative Path Hash Map in Python

Recursively walk a directory and map normalized relative paths to absolute file paths using a defaultdict hash map.

os.walk file-index defaultdict
Python 
import os
from collections import defaultdict


def build_file_index(root_dir):
    index = defaultdict(list)

    for dirpath, dirnames, filenames in os.walk(root_dir):
        for filename in filenames:
            full_path = os.path.join(dirpath, filename)
            relative_path = os.path.relpath(full_path, roo…
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