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answered 2012-12-20 11:44:49 -0500

DSM gravatar image

You can use reset():

sage: a = 3
sage: a
3
sage: reset()
sage: a
---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
[...]
NameError: name 'a' is not defined

You can also give variable names, like reset("a b c") and so on. Type reset? at the console for the details.