how to install ast python package

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http://unix.stackexchange.com – I'm using django constance in my project. This app used a python package ast. When I try to install that package using command pip-2.7 install ast, it results as "Could not find any downloads that satisfy the requirement ast". Can some one help me how to install this package in CentOS? I tried searching in google, unfortunately I couldn't find any link. (HowTos)