CentOS7 安裝Python3.6.8

1. 安裝依賴環(huán)境

   yum -y groupinstall "Development tools"

yum -y install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gdbm-devel db4-devel libpcap-devel xz-devel

2、下載Python3.6.8

新建個(gè)/usr/local/python3文件夾

mkdir /usr/local/python3

　 
在python3文件夾下下載安裝包

（/usr/local/python3 )

wget https://www.python.org/ftp/python/3.6.8/Python-3.6.8.tar.xz

解壓文件

tar -xvf Python-3.6.8.tar.xz

3、安裝Python3

創(chuàng)建安裝文件的路徑

mkdir /usr/local/python3

4、編譯（在解壓的文件夾下 /usr/local/python3/python3.6.8)

./configure --prefix=/usr/local/python3

5、安裝（在解壓的文件夾下 /usr/local/python3/python3.6.8)

make
make install  # 先make再make install

6、創(chuàng)建新版本的軟鏈接

修改舊版本

mv /usr/bin/python /usr/bin/python_bak
mv /usr/bin/pip /usr/bin/pip_bak

創(chuàng)建新的軟連接　　

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

檢查python的版本

python -V

7、配置成功后，pip3用不了，需要進(jìn)一步配置

將/usr/local/python3/bin加入PATH

vim ~/.bash_profile

修改后如下： 
.bash_profile

 #Get the aliases and functions
if [ -f ~/.bashrc ]; then
        . ~/.bashrc
fi

# User specific environment and startup programs

PATH=$PATH:$HOME/bin:/usr/local/python3/bin

export PATH

復(fù)制代碼 
保存退出后，執(zhí)行以下命令，讓上一步修改成功

source ~/.bash_profile 
完成！

不過(guò)，由于yum是py2寫(xiě)的，所以更換完python路徑后，yum可能會(huì)出現(xiàn)錯(cuò)誤 
所以要修改配置文件

vim /usr/bin/yum

vim /usr/libexec/urlgrabber-ext-down

把第一行python改為python2