Mac 切换默认python2.7为python3.9，ModuleNotFoundError: No module named ‘requests‘

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vim ~/.bash_profile

#python 默认3.9
export PATH=/usr/local/Frameworks/Python.framework/Versions/3.9/bin:$PATH
alias python="/usr/local/Frameworks/Python.framework/Versions/3.9/bin/python3.9"
#python

添加上面代码至bash_profile并保存退出

source ~/.bash_profile

luwb@LuwbdeMacBook-Pro data % python --version
Python 3.9.0

解决 python运行时报错：ModuleNotFoundError: No module named 'requests' 问题

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