try this to install pip : "easy_install-2.7 -U --user pip"
**another important info**
To install pip on Ubuntu, Debian or Linux Mint:
$ sudo apt-get install python-pip
To install pip on Fedora:
$ sudo yum install python-pip
To install pip on CentOS, first enable EPEL repository, and then run:
$ sudo yum install python-pip
To install pip on Archlinux:
$ sudo pacman -S python-pip
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…