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mac 环境安装 python3  (3.7.2) 源码包方式

mac 安装 start————————————

pkg 安装 推荐；（源码包总是 报  SSL error)

注意，必须是root安装，root 下操作 比如

pip3 install Scrapy

Location: /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages

下载pkg包

Python for macOS consists of the Python programming language interpreter, plus a set of programs to allow easy access to it for macOS users including an integrated development environment IDLE.

Certificate verification and OpenSSL

This variant of Python 3.7 includes its own private copy of OpenSSL 1.1.0.  The deprecated Apple-supplied OpenSSL libraries are no longer used

Python 3 and Python 2 Co-existence

Python.org Python 3.7 and 2.7.x versions can both be installed on your system and will not conflict. Command names for Python 3 contain a 3 in them, python3 (or python3.7), idle3 (or idle3.7), pip3 (or pip3.7), etc.  Python 2.7 command names contain a 2 or no digit: python2 (or python2.7 or python), idle2 (or idle2.7 or idle), etc.

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