Curious relation
Dan Bishop
danb_83 at yahoo.com
Thu Apr 24 01:08:49 EDT 2008
On Apr 23, 11:51 pm, Greg J <greg.ja... at gmail.com> wrote:
> I was reading the programming Reddit tonight and came across this
> (http://reddit.com/info/6gwk1/comments/):
>
> >>> ([1]>2)==True
> True
> >>> [1]>(2==True)
> True
> >>> [1]>2==True
>
> False
>
> Odd, no?
>
> So, can anyone here shed light on this one?
A long time ago, it wasn't possible for comparison operators to raise
exceptions, so it was arbitrarily decided that numbers are less than
strings. Thus, [1]>2 and [1]>False. This explains your first two
examples.
For the third, remember that the comparison operators are chained, so
a>b==c means (a>b) and (b==c). Since 2==True is false, so is the
entire expression.
In Python 3.0, all three of these expressions will raise a TypeError.
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