我可以像这样获得trove classifiers的列表：
>>> import requests
>>> response = requests.get('https://pypi.python.org/pypi', params={':action': 'list_classifiers'})
>>> classifiers = response.text.splitlines()
>>> len(classifiers)
649
>>> classifiers[:5]
['Development Status :: 1 - Planning',
'Development Status :: 2 - Pre-Alpha',
'Development Status :: 3 - Alpha',
'Development Status :: 4 - Beta',
'Development Status :: 5 - Production/Stable']
有没有办法在不使用网络访问的情况下获取此列表？例如，列表是否存在于distutils中？真相的来源在哪里？