Python3.x +CentOS6.4 环境下安装gevent问题

1.在import gevent出现错误；

2.发现没有导入gevent模块；

3.命令pip3 install gevent，出现错误：

Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-geblsdb1/gevent

4.同样提示：You are using pip version 7.1.2, however version 19.1.1 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.

5.参照网络上的各种方法都无用；

6.解决方案：

6.1升级pip3:====》pip3 install --upgrade pip

6.2 pip3 install  greenlet；Successful installed greenlet-xxxx；

6.3 pip3 install gevent；Successfully installed gevent-1.4.0；

7.问题解决