如何检测shutil.copytree是否完成复制？

import shutil

try:
    shutil.copytree(source_dir, destination_dir)
    print("复制完成")
except Exception as e:
    print("复制失败:", str(e))

import os
import shutil

def compare_directories(source, destination):
    for dirpath, dirnames, filenames in os.walk(source):
        relative_path = os.path.relpath(dirpath, source)
        destination_path = os.path.join(destination, relative_path)
        if not os.path.exists(destination_path):
            return False
        for filename in filenames:
            source_file = os.path.join(dirpath, filename)
            destination_file = os.path.join(destination_path, filename)
            if not os.path.exists(destination_file):
                return False
            if os.path.getsize(source_file) != os.path.getsize(destination_file):
                return False
    return True

shutil.copytree(source_dir, destination_dir)
if compare_directories(source_dir, destination_dir):
    print("复制完成")
else:
    print("复制未完成")