Richard D. Moores, 05.07.2010 11:37:
I keep getting hung up over the meaning of "the return
value" of an expression. I am of course familiar with values returned
by a function, but don't quite grasp what the return value of, say,
the y of "x and y" might mean.
Think of a different expression, like "1+1". Here, the return value (or
maybe a better wording would be the result value) is 2.
Also, you distinguish between a return value of True and and the value
of y being such (say 5, and not 0) that it makes y true (but not
True). So another thing I need to know is the difference between True
and true. Also between False and false. And why the difference is
important.
"True" is the value "True" in Python, which is a singleton. You can test
for it by using
x is True
However, other values can have a true values as well, without being True, e.g.
if 1: print("TRUE!!!")
will actuall print the string, as the value 1 is considered true when
turned into a boolean result.
Stefan
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