Mac pip confirming SSL certificate

好久没有使用mac写python代码了，今天打算写一个apscheduler例子，发现机器上并没有装该包，然后通过pip3下载发现报了如下错误：

Collecting apscheduler

Could not fetch URL https://pypi.python.org/simple/apscheduler/: There was a problem confirming the ssl certificate: [SSL: TLSV1_ALERT_PROTOCOL_VERSION] tlsv1 alert protocol version (_ssl.c:645) - skipping

Could not find a version that satisfies the requirement apscheduler (from versions: )

No matching distribution found for apscheduler

然后通过pip3 --version查看当前pip3版本为9.0.1版本，看网上都说需要升级pip版本，因为在python命令行执行import ssl并没有报错，所以就可以排除是本地ssl库没安装问题。

后来尝试升级pip，如下：

$ pip install --upgrade pip
Could not fetch URL https://pypi.python.org/simple/pip/: There was a problem confirming the ssl certificate: [SSL: TLSV1_ALERT_PROTOCOL_VERSION] tlsv1 alert protocol version (_ssl.c:645) - skipping
Requirement already up-to-date: pip in /Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages

解决办法：

执行步骤如下：

$ curl https://bootstrap.pypa.io/get-pip.py | python3% Total    % Received % Xferd  Average Speed   Time    Time     Time  CurrentDload  Upload   Total   Spent    Left  Speed
100 1659k  100 1659k    0     0   288k      0  0:00:05  0:00:05 --:--:--  513k
Collecting pipDownloading https://files.pythonhosted.org/packages/d8/f3/413bab4ff08e1fc4828dfc59996d721917df8e8583ea85385d51125dceff/pip-19.0.3-py2.py3-none-any.whl (1.4MB)100% |████████████████████████████████| 1.4MB 4.4MB/s
Collecting wheelDownloading https://files.pythonhosted.org/packages/96/ba/a4702cbb6a3a485239fbe9525443446203f00771af9ac000fa3ef2788201/wheel-0.33.1-py2.py3-none-any.whl
Installing collected packages: pip, wheelFound existing installation: pip 9.0.1Uninstalling pip-9.0.1:Successfully uninstalled pip-9.0.1
Successfully installed pip-19.0.3 wheel-0.33.1

再执行pip3 --version发现已经升级到19.0.3版本，OK!

执行pip3 install apscheduler，一切正常！

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Mac pip confirming SSL certificate

解决办法：

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