[Tutor] Python Branches

[vanam]

i started slowly learning python as i dont have much exposure to it and  i
wanted to know what are all branches there in python actually i installed py
2.5 recently i come across question in groups about the gui where in pygtk
should be installed.My question is without this installation could i able to
develop any application using py2.5?One more thing is what is tkinter?Can
any one explain what are all branches in python and how it could be used?
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                                           Vanam
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