Linux下安装Python3.4

PS：如果本机安装了python2，尽量不要管他，使用python3运行python脚本就好，因为可能有程序依赖目前的python2环境，

比如yum！！！！！

不要动现有的python2环境！

1. 安装依赖环境

# 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.下载Python3.4

# wget https://www.python.org/ftp/python/3.4.10/Python-3.4.10.tgz

3.安装Python3.4

　　我安装到了 /usr/local/python3 （具体看你）

　　创建目录

# mkdir -p /usr/local/python3

4.解压下载好的Python-3.4.10.tgz包

# tar -xvf Python-3.4..tgz

5. 进入解压后的目录，编译安装。

# cd Python-3.4./
#  ./configure --prefix=/usr/local/python3

make

# make

make install

# make install

6.建立python3的软链

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

7.并将/usr/local/python3/bin加入PATH

# vim ~/.bash_profile
# .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

　按ESC，输入:wq回车退出。

　修改完记得执行行下面的命令，让上一步的修改生效：

# source ~/.bash_profile

检查Python3及pip3是否正常可用：

# python3 -V