On Wed 09 Jan 2013 01:56:20 AM EST, ken brockman wrote:
I was looking through some lab material from a computer course offered
at UC Berkeley and came across some examples in the form of questions
on a test about python.
1 and 2 and 3
answer 3
I've goggled it till i was red in the fingers, but to no avail.. Could
someone be kind enuff to direct me to some docs that explain this??
I've no clue what the hell is going on here..
Thanks much for any help you may supply.
_______________________________________________
Tutor maillist - Tutor@python.org
To unsubscribe or change subscription options:
http://mail.python.org/mailman/listinfo/tutor
It returns last evaluated value. If you have '1 and 2', 1
is 'truthy', so it needs to evaluate 2, and then 2 is returned.
With '0 and 2', 0 is falsy, so it does not need to evaluate
past it and returns 0.
With '0 or 2', it needs to evaluate 2 and returns its value.
This is particularly useful to assign only when a value is
falsy:
default_x = 5
def f(x):
x = x or default_x
So if x is provided, it is used, but if x is, let's say, None,
default_x will be used.
HTH, - mitya
--
Lark's Tongue Guide to Python: http://lightbird.net/larks/
_______________________________________________
Tutor maillist - Tutor@python.org
To unsubscribe or change subscription options:
http://mail.python.org/mailman/listinfo/tutor
