wget https://www.python.org/ftp/python/3.6.7/Python-3.6.7.tgz
tar -zxvf Python-3.6.7.tgz
cd Python-3.6.7/ ./configure prefix=/usr/local/python36 make && make instal
which python3 结果: /usr/bin/python3
mv /usr/bin/python3 /usr/bin/python3.bak
ln -s /usr/local/python36/bin/python3 /usr/local/bin/
ln -s /usr/local/python36/bin/pip /usr/local/bin/pip3 执行pip3 -V 可以看到指向了python3,成功!
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