Setting to change IPython prompt to'>>>' at startup

In 0.12, you can change the prompt to'>>>' with the magic command doctest_mode.

In [1]: %doctest_mode
Exception reporting mode: Plain
Doctest mode is: ON
>>>

Since it is troublesome to hit each time, define the following alias so that it will be changed automatically at startup.

alias ipy='ipython -ic "%doctest_mode"'

In versions prior to 0.12 (maybe earlier),'ipython -cl' seems to have done the same.