[Python] Disable automatic printing in Python interactive session

I am looking for a way to modify the default behavior of Python interactive sessions so that expressions do not automatically print out results. For example, take this following interactive session:

~$ python
Python 2.7.3 (default, Aug 1 2012, 05:16:07)
[GCC 4.6.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> x = 5
>>> y = 7
>>> x + y
12
>>> first_name = "Test"
>>> last_name = "Person"
>>> first_name + last_name
'TestPerson'


This would enforce using the print statement to avoid confusion later on. I was unable to find settings for this.

I can preconfigure the machine beforehand, so any solutions work. Is this possible, or what change to the interactive sessions creates this effect?

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