[Python] How do I control number formatting in the python interpreter?

I often use the python interpreter for doing quick numerical calculations and would like all numerical results to be automatically printed using, e.g., exponential notation. Is there a way to set this for the entire session?

For example, I want:

>>> 1.e12
1.0e+12


not:

>>> 1.e12
1000000000000.0

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