七步安装python3,且使python3和python2共存
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yum install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gcc* make -y
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wget https://www.python.org/ftp/python/3.6.5/Python-3.6.5.tar.xz
可换源
wget http://npm.taobao.org/mirrors/python/3.6.5/Python-3.6.5.tar.xz
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tar -Jxvf Python-3.6.5.tar.xz
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cd Python-3.6.5/
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./configure prefix=/usr/local/python3
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make && make install
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ln -s /usr/local/python3/bin/python3 /usr/bin/python3
ln -s /usr/local/python3/bin/pip3 /usr/bin/pip3