有一天運行一個爬蟲程序時報以下錯誤：

:0: UserWarning: You do not have a working installation of the service_identity module: ‘cannot import name ‘原錯誤中這是一個不能導入某個包，忘了是啥了’’. Please install it from https://pypi.python.org/pypi/service_identity and make sure all of its dependencies are satisfied. Without the service_identity module, Twisted can perform only rudimentary TLS client hostname verification. Many valid certificate/hostname mappings may be rejected.
參考：使用Scrapy時遇到：UserWarning: You do not have a working installation of the service_identity module
發生以上錯誤的根本原因原因得看這句話

You do not have a working installation of the service_identity module

在service-identity 21.1.0下載了一個文件service_identity-21.1.0-py2.py3-none-any.whl放在 D:\python3\Scripts下
使用

pip install service_identity-21.1.0-py2.py3-none-any.whl

安裝失敗
報錯：

service-identity is already installed with the same version as the provided whee l. Use --force-reinstall to force an installation of the wheel.

嘗試使用

pip install service_identity-21.1.0-py2.py3-none-any.whl --force --upgrade

報錯：

ERROR: Could not install packages due to an OSError: [WinError 5] 拒絕訪問。: 'd :\\python3\\lib\\site-packages\\_cffi_backend.cp36-win_amd64.pyd' Consider using the `--user` option or check the permissions.

嘗試使用

pip install --user service_identity-21.1.0-py2.py3-none-any.whl --force --upgrade

成功！

Successfully installed attrs-21.2.0 cffi-1.14.6 cryptography-3.4.8 pyasn1-0.4.8 pyasn1-modules-0.2.8 pycparser-2.20 service-identity-21.1.0 six-1.16.0

總結

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