方法一
wget https://bootstrap.pypa.io/get-pip.py python get-pip.py
方法二
wget https://pypi.python.org/packages/source/p/pip/pip-1.3.1.tar.gz --no-check-certificate tar xvf pip-1.3.1.tar.gz python pip-1.3.1/setup.py install
方法三
yum install -y epel-release yum install -y python-pip