CentOS 7 升级Python2.7到Python-3.7.4

yum -y install zlib zlib-devel
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mkdir /usr/local/python3 

cd /usr/local/python3
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# 下载
wget https://www.python.org/ftp/python/3.7.4/Python-3.7.4.tgz
# 解压
tar -zxf Python-3.7.4.tgz
# 安装依赖包
yum install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gcc  libffi-devel
# 进入python目录
cd Python-3.7.4
# 编译
./configure --prefix=/usr/local/python3.7
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yum install -y libffi-devel
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make && make install
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mv /usr/bin/python /usr/bin/python.bak
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ln -s /usr/local/python3.7/bin/python3.7 /usr/bin/python

4：更改yum配置修改yum不能用的问题 vi用不了,改成vim 
vi /usr/bin/yum
#!/usr/bin/python --> #!/usr/bin/python2.7
vi /usr/libexec/urlgrabber-ext-down
#!/usr/bin/python --> #!/usr/bin/python2.7
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5：安装pip
cd ~
yum -y install epel-release
yum -y install python-pip
yum clean all
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[root@moli-linux03 src]# python -V
Python 3.7.4
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