mac 切换Python版本

mac 系统本身自带了 python 2.6版本，然后自己又下载了python 3.5,导致在终端命令中不能切换，
打开 ~/.bash_profile

# Setting PATH for Python 2.7
# The orginal version is saved in .bash_profile.pysave
PATH="/Library/Frameworks/Python.framework/Versions/2.7/bin:${PATH}"
export PATH

# Setting PATH for Python 3.5
# The orginal version is saved in .bash_profile.pysave
# PATH="/Library/Frameworks/Python.framework/Versions/3.5/bin:${PATH}"
# export PATH
# alias python="/Library/Frameworks/Python.framework/Versions/3.5/bin/python3.5"
export PATH=/opt/subversion/bin:$PATH

[[ -s "$HOME/.rvm/scripts/rvm" ]] && source "$HOME/.rvm/scripts/rvm" # Load RVM into a shell session *as a function*

只想在终端中切换

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问题

• 1.当安装pip install twisted时候遇到权限，所以加个sudo

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网络不好，多尝试几遍成功了

也可以参照 http://blog.csdn.net/lijiang1991/article/details/51775896