Please tell me how to execute python file in Ubuntu by double clicking on file.

[dhananjaysingh091298]

Respected Sir/Mam,
        I am Dhananjay Singh,Student of IIIT Manipur. Sir/Mam when i am double 
click in python program (Dhananjay.py),it is opening in Text Editor by Default 
in Ubuntu.I want to run this program when i double click on it as any *.Exe 
file executes as in Window.
Sir please help me.
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