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上代码：

import osfrom shutil import copy2SOURCE = "c:\\source\\"DEST = "c:\\dest\\"# Iterate recursively through all files and folders under the source directoryfor path, dirs, files in os.walk(SOURCE):    # For each directory iterate over the files    for f in files:        # Grab the first letter of the filename        starting_letter = f[0].upper()        # Construct the full path of the current source file        source_path = os.path.join(path, f)        # Construct the destination path using the first letter of the        # filename as the folder        dest_path = os.path.join(DEST, starting_letter)        # Create the destination folder if it doesn't exist        if not os.path.isdir(dest_path):            os.makedirs(dest_path)        # Copy the file to the destination path + starting_letter        copy2(source_path, dest_path)

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