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Python 2.7 button not visible. Only Python 3 button shows up

Yesterday, I was able to see the "Python 2.7" Button above editor. But today it got invisible and instead of that "Python 3" Button appears.

I am more familiar with Python2.7 syntax. Would anyone please let me know how to get back that button?

Thanks in advance.

asked Feb 15, 2017 by nsantoshpatel