Operator Precedence/Boolean Logic
Ben Finney
ben+python at benfinney.id.au
Tue Jun 21 23:59:10 EDT 2016
Elizabeth Weiss <cake240 at gmail.com> writes:
> Hi There,
Welcome! Your questions are fine here, but you may like to know that we
also have a beginner-specific forum for collaborative tutoring
<URL:https://mail.python.org/mailman/listinfo/tutor>.
> I am a little confused as to how this is False:
> False==(False or True)
>
> I would think it is True because False==False is true.
What does ‘(False or True)’ evaluate to, when you try it in the REPL?
> I think the parenthesis are confusing me.
> (False==False) or True
>
> This is True. Is it because False==False? And True==False is not True
> but that does not change that this is True.
Heh. You express the confusion quite well :-)
Try the component expressions in the REPL (the interactive interpreter
session) and see if that helps::
>>> False or True
…
>>> (False or True)
…
>>> True == False
…
>>> (True == False)
…
>>> False == False
…
>>> (False == False)
…
Then, once you think you understand what those expressions evaluate to,
look again at how those results would work in a more complex
expression::
>>> False == (False or True)
…
>>> (False == False) or True
…
> Thank you for your help!
I hope that helps.
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Ben Finney
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