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Files & data

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

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Files & data medium

How to Find Duplicate Files by Size and Hash in Python

Recursively scan a directory, group files by size, then hash candidates to identify exact duplicate files.

deduplication filesystem hashlib
Python 
import hashlib
from pathlib import Path

def hash_file(path, chunk_size=8192):
    hasher = hashlib.md5()
    with open(path, 'rb') as f:
        while chunk := f.read(chunk_size):
            hasher.update(chunk)
    return hasher.hexdigest()

def find_duplicates(directory):
    size_map = {}
    for path in Path(dir…
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