确定环境中哪些python pip包从来没有被调用？

import os
import site
import sys

def find_unused_packages():
    site_packages_dir = site.getsitepackages()[0]
    unused_packages = []

    for root, dirs, files in os.walk(site_packages_dir):
        if '__pycache__' in dirs:
            pycache_dir = os.path.join(root, '__pycache__')
            mtime = os.path.getmtime(pycache_dir)
            if mtime < os.path.getmtime(root):
                unused_packages.append(root)

    return unused_packages

unused_packages = find_unused_packages()
print("从未被调用的pip包：")
for package in unused_packages:
    print(package)