Duplicate finder python modules

def findDup(parentFolder):
    # Dups in format {hash:[names]}
    dups = {}
    for dirName, subdirs, fileList in os.walk(parentFolder):
        print('Scanning %s...' % dirName)
        for filename in fileList:
            # Get the path to the file
            path = os.path.join(dirName, filename)
            # Calculate hash
            file_hash = hashfile(path)
            # Add or append the file path
            if file_hash in dups:
                dups[file_hash].append(path)
            else:
                dups[file_hash] = [path]
    return dups

Source: pythoncentral.io

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