linux install python3 and pip3

linux system (centos, redhat) comes under normal circumstances python2 and pip, but now the mainstream version of python is python3, so it is necessary python2 and python3 coexist.

1. Install depend on the environment

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. Install the gcc compiler

yum install gcc -y

3. Download the installation package python

wget https://www.python.org/ftp/python/3.6.5/Python-3.6.5.tgz


#可以直接去python官网自己下载，不过注意版本！推荐使用双数

4. speak directly to the installation package movement in / usr / local /

mv Python-3.6.5.tgz /usr/local/

#这里可以不需要移动，移动到需要的目录下即可（后面配置需要依次修改）

5. Create python3 installed in the local directory folder

mkdir /usr/local/python3

6. Go to the directory where the Python-3.6.5.tgz under

cd /usr/local/

7. extracting installation package

tar -xvf Python-3.6.5.tgz

8. unzip the file into the folder

cd /usr/local/Python-3.6.5/

9. Installation Directory Configuration

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

10. Compile the source code and

make

11. compile the source code after installation

make install

12. Create a connection

 ln -s /usr/local/python3/bin/python3  /usr/bin/python3 
 
 相当于配置环境变量；这时直接输入python3 应该就可以直接进入python3的操作页面。 意味着python3 安装好了

13. Download setuptools

wget --no-check-certificate  https://pypi.python.org/packages/source/s/setuptools/setuptools-19.6.tar.gz


 --no-check-certificate :意味着以不安全的方法连接

##下载文件的md5校验码：c607dd118eae682c44ed146367a17e26

14. The decompression

tar -zxvf setuptools-19.6.tar.gz

15. Go to the extracted files

cd setuptools-19.6/

16. Build

python3 setup.py build

17. Install

python3 setup.py install

18. Create a soft link

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

19. Check the version pip

pip3 -V 
此时显示的为python3.6的版本的pip即成功了

! ! ! Need to update the files after the update pip3, or simply restart the virtual machine

Python3 install linux environment and pip3