安装Python3

# 1. 查看python是否安装

python -V

# 2. 查看python指令解析流程

which python # 看到python位置 
cd /usr/bin 
ls -al python* # 查看python相关指令

# 1. 下载Python3.6.6 
cd /usr/local
wget https://www.python.org/ftp/python/3.6.6/Python-3.6.6.tgz 
# 2. 解压
tar -zxvf Python-3.6.6.tgz
# 3. 进入解压目录,编译
 cd /usr/local/Python-3.6.6 
./configure --prefix=/usr/local/python3 
# 编译时会检查安装个包是否可用,且指定安装目录 
# 4. 安装
 cd /usr/local/Python-3.6.6 make make install 
# 5. 建立python3 指令软连接
 ln -s /usr/local/python3/bin/python3.6 /usr/bin/python3 
# 6. 测试python是否可用 
python3 -V 
#7. 建立pip3 软连接
 ln -s /usr/local/python3/bin/pip3.6 /usr/bin/pip3 
# 8.测试 
pip3 -V
 pip3 list 
# 9. 更新pip3指令

pip3 install --upgrade pip