#!/usr/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pythonecho "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/pydocln -s ${PYPATH}/bin/python"$new_version" /usr/bin/pythonln -s ${PYPATH}/bin/pythonw"$new_version" /usr/bin/pythonwln -s ${PYPATH}/bin/python"$new_version"m-config /usr/bin/python-configpython_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}‘ >> ~/.bashrcexit #退出超级权限