mac上怎么更新python？步骤如下：

第1步：下载Python3.4

下载地址如下：

下载Mac OS X 64-bit/32-bit installer

https://www.python.org/downloads/release/python-340/

第2步：安装

安装下载的dmg文件。

第3步：配置，创建下面的script， 改下版本号即可。

[plain] view plaincopy在CODE上查看代码片派生到我的代码片。#!/bin/bash

#python版号需要修改两个地方

#1. new_version

#sudo -i #得到超级权限

new_version="3.4"

PYPATH=/System/Library/Frameworks/Python.framework/Versions/"$new_version"

#第1步移动新版python到mac默认目录下

echo "move.." mv /Library/Frameworks/Python.framework/Versions/"$new_version" /System/Library/Frameworks/Python.

framework/Versions/

#第2步改变用户目录的用户组

echo "chown.." chown -R root:wheel ${PYPATH}

#第3步 删除原来2.7的链接

echo "del.." rm /System/Library/Frameworks/Python.framework/Versions/Current

#第4步重新链接到最新版本的python

echo "ln.." ln -s ${PYPATH} /System/Library/Frameworks/Python.framework/Versions/Current

#第5步删除旧的命令符号链接

echo "rm.." rm /usr/bin/{pydoc,python,pythonw,python-config} echo "ln bin.."

#第6步重新建立新的命令符号链接

ln -s ${PYPATH}/bin/pydoc"$new_version" /usr/bin/pydoc ln -s ${PYPATH}/bin/python"$new_version" /usr/bin/python

ln -s ${PYPATH}/bin/pythonw"$new_version" /usr/bin/pythonw ln -s ${PYPATH}/bin/python"$new_version"m-config

/usr/bin/python-config python_param_list=`cd /usr/local/bin && ls -al |grep "Python"|awk 'ORS=" " {print $9}'`

#第7步修复其他链接

for i in $python_param_list;do echo "info: $i" rm -f /usr/local/bin/${i}

ln -sv /System/Library/Frameworks/Python.framework/Versions/"$new_version"/bin/${i} /usr/local/bin/${i} done

#第8步环境变量要修改为最新的版本号

echo 'export PATH=/System/Library/Frameworks/Python.framework/Versions/3.4/bin:${PATH}' >> ~/.bashrc

exit #退出超级权限

查看当前python版本

[html] view plaincopybixiaopeng@bixiaopengtekiMacBook-Pro ~$ python --version