Can I write an abbreviation that only works at the beginning of the line?

Hi,

I am asking here because I am not sure myself how to google it.
I tried with something similar to the subject of this email, but no
luck. That, or I didn't actually understand what I found.

Let's say, and this is not my real need but a very clear example, I
want to write an abbreviation that converts, when writing python code:

class

into

class (object):

But I only want that to works when string "class" is being printed at
the beginning of a line.
I don't want the replacement to happen when I am writing the docstring
like "This is a class that does this and that".

Is it possible?

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