python3安装与使用（Linux）

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

wget https://www.python.org/ftp/python/3.7.1/Python-3.7.1.tgz

tar -zxvf Python-3.7.1.tgz
cd Python-3.7

1)安装gcc
yum install gcc

2)3.7版本之后需要一个新的包libffi-devel
yum install libffi-devel -y

3)生成编译脚本
./configure --prefix=/usr/local/python3  

4）编译与安装
make && make install

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

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

vim /etc/profile

加入代码：
PATH=$PATH:/usr/local/python3/bin

立即生效：
source /etc/profile

python3 -V
Python 3.7.1

pip3 -V
pip 10.0.1 from /usr/local/python3/lib/python3.7/site-packages/pip (python 3.7)