一些古老的代码是基于python2的, 需要安装一些模块的时候发现提示出错了

#pip install requests

You are using pip version 7.1.0, however version 23.1.2 is available.
You should consider upgrading via the ‘pip install –upgrade pip’ command.
Collecting requests
/usr/lib/python2.6/site-packages/pip/vendor/requests/packages/urllib3/util/ssl.py:90: InsecurePlatformWarning: A true SSLContext object is not available. This prevents urllib3 from configuring SSL appropriately and may cause certain SSL connections to fail. For more information, see https://urllib3.readthedocs.org/en/latest/security.html#insecureplatformwarning.
InsecurePlatformWarning
/usr/lib/python2.6/site-packages/pip/vendor/requests/packages/urllib3/util/ssl.py:90: InsecurePlatformWarning: A true SSLContext object is not available. This prevents urllib3 from configuring SSL appropriately and may cause certain SSL connections to fail. For more information, see https://urllib3.readthedocs.org/en/latest/security.html#insecureplatformwarning.
InsecurePlatformWarning

看提示是SSL 协商失败了, 嗯嗯, 猜测是pip的SSL版本过于旧, 需要升级下pip,结果又失败了

#pip install –upgrade pip

You are using pip version 7.1.0, however version 23.1.2 is available.
You should consider upgrading via the ‘pip install –upgrade pip’ command.
Collecting pip
Using cached https://files.pythonhosted.org/packages/fa/ee/74ff76da0ab649eec7581233daeb43d8aa35383d8f75317b2ab3b80c922f/pip-23.1.2.tar.gz
Complete output from command python setup.py egg_info:
Traceback (most recent call last):
File “”, line 20, in
File “/tmp/pip-build-p1lQDp/pip/setup.py”, line 7
def read(rel_path: str) -> str:
^
SyntaxError: invalid syntax

----------------------------------------

Command “python setup.py egg_info” failed with error code 1 in /tmp/pip-build-p1lQDp/pip

其实多年以前pip的在线安装和升级已经不支持python2了, 需要手工升级下

https://bootstrap.pypa.io/pip/2.7/get-pip.py

https://bootstrap.pypa.io/pip/2.6/get-pip.py

这两个分别是python的2.6 和 2.7版本的pip手工升级包, 当前时间的版本应该是pip-20.3.4, 下载后用python执行就可以自动升级pip了, 然后安装其他模块也没有问题