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七步安装python3，且使python3和python2共存

1

yum install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gcc* make -y

2

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

3

 tar -Jxvf Python-3.6.5.tar.xz 

4

cd Python-3.6.5/

5

./configure prefix=/usr/local/python3

6

make && make install

7

ln -s /usr/local/python3/bin/python3 /usr/bin/python3

ln -s /usr/local/python3/bin/pip3 /usr/bin/pip3