I first installed Java; then installed Eclipse IDE using this (no problems at all).
Then I installed Pydev using this.
But whenever I launch Eclipse in my home folder it opens Java IDE not Python IDE.
In Help --> Installation Details --> I can find Pydev.
How can I open Python IDE in eclipse or choose the IDE I want?
Python and Java are installed in the same directory.
It sounds like you just need to switch to the PyDev perspective instead of the Java perspective. Do this using 'Window > Perspective > Open Perspective' and choose 'Other > PyDev'.