Bigder: upgrade python2.7 to python3.7.3 under Linux CentOS

Linux Is installed by default on the server python2.7, Follow the steps below to upgrade to python3

1、 Install dependency packages

Python3.7 Version above , You need to install one more dependency package :

> yum install -y libffi-devel

Otherwise ModuleNotFoundError: No module named _ctypes The error of .

2、 install python 3.7.3

# download > wget https://www.python.org/ftp/python/3.7.3/Python-3.7.3.tgz

# decompression > tar -zxf Python-3.7.3.tgz

# Install dependency packages > yum install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gcc libffi-devel

# Get into python3 Unzip directory > cd Python-3.7.3

# compile > ./configure --prefix=/usr/local/python3.7

# install > make && make install

3、 Backup Python2 edition

The system may depend on some software Python2 function , So you can't delete Python2, Need for the original python Soft connection pointing python3

>mv /usr/bin/python /usr/bin/python.bak

Create a new soft connection

> ln -s /usr/local/python3.7/bin/python3 /usr/bin