linux安装python3（已有python2.x情况下）

参考：https://www.cnblogs.com/Guido-admirers/p/6259410.html

1.官网下载python3

cd /home/download

wget https://www.python.org/ftp/python/3.6.0/Python-3.6.0.tgz

2. 解压到指定目录

mkdir /user/local/python3

tar -xvf Python-3.6.0.tgz -C /user/local/python3

3. 编译、安装

./configure --prefix=/usr/local/python3 #设置安装路径

make

make install

4. 创建新的软连接

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

5、检查python是否安装成功

python3 -V

python-3.6.0

python2与python3共存之后 pip 无法使用解决方法：

python3 -m pip install packagename