python3安装pip3（install pip3 for python 3.x）

tar -xf Python-3.5.2.tar.xz 

yum install openssl-devel -y
yum install zlib-devel -y

cd Python-3.5.2
./configure --prefix=/opt/Python #安装目录可以自己定义无所谓。
make
make install

# ln -s /opt/Python/bin/python3 /usr/bin/python3

wget --no-check-certificate https://pypi.python.org/packages/source/s/setuptools/setuptools-19.6.tar.gz#md5=c607dd118eae682c44ed146367a17e26

tar -zxvf setuptools-19.6.tar.gz
cd setuptools-19.6.tar.gz
python3 setup.py build
python3 setup.py install

wget --no-check-certificate https://pypi.python.org/packages/source/p/pip/pip-8.0.2.tar.gz#md5=3a73c4188f8dbad6a1e6f6d44d117eeb

tar -zxvf pip-8.0.2.tar.gz
cd pip-8.0.2
python3 setup.py build
python3 setup.py install

[root@centos3 bin]# python3
Python 3.5.2 (default, Jul 27 2016, 03:36:56) 
[GCC 4.4.7 20120313 (Red Hat 4.4.7-4)] on linux
Type "help", "copyright", "credits" or "license" for more information.
> import pymysql
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
ImportError: No module named 'pymysql' ##没有此模块奥
> 

[root@centos3 bin]# /opt/Python/bin/pip3 install pymysql
Collecting pymysql
 Downloading PyMySQL-0.7.5-py2.py3-none-any.whl (77kB)
 100% |████████████████████████████████| 81kB 3.2kB/s 
Installing collected packages: pymysql
Successfully installed pymysql-0.7.5

######安装完成

[root@centos3 bin]# python3
Python 3.5.2 (default, Jul 27 2016, 03:36:56) 
[GCC 4.4.7 20120313 (Red Hat 4.4.7-4)] on linux
Type "help", "copyright", "credits" or "license" for more information.
> import pymysql
>