I am never going to complain about Python again
Roy Smith
roy at panix.com
Thu Oct 10 09:09:42 EDT 2013
In article <52562ee3$0$2931$c3e8da3$76491128 at news.astraweb.com>,
Steven D'Aprano <steve at pearwood.info> wrote:
> Just came across this little Javascript gem:
>
> ",,," == Array((null,'cool',false,NaN,4));
>
> => evaluates as true
>
> http://wtfjs.com/2011/02/11/all-your-commas-are-belong-to-Array
>
> I swear, I am never going to complain about Python again.
I've just finished reading JavaScript: The Good Parts, by Douglas
Crockford (now I'm working on the harder part of re-reading it slowly,
to make sure I really understand it). Anybody who is forced to work
with javascript should read this book. It's the K&R of JS.
Anyway, one of the pieces of advice he gives is to pretend that ==
doesn't exist, and always use ===. PHP suffers from much the same
problem.
BTW, here's a Python equality oddity:
>>> r = 0.0
>>> c = 0 + 0j
>>> r == c
True
>>> int(r) == int(c)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: can't convert complex to int
If x == y, then f(x) should also equal f(y). More specifically, if x ==
y, and x is in the domain of f(), then y should also be in the domain of
f().
BTW, one of the earliest things that turned me on to Python was when I
discovered that it uses j as the imaginary unit, not i. All
right-thinking people will agree with me on this.
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