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Bad Code Snippet of the Day

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  Bad Code Snippet of the Day Chris Angelico <rosuav@gmail.com> - 2014-02-19 03:47 +1100
    Re: Bad Code Snippet of the Day Rick Johnson <rantingrickjohnson@gmail.com> - 2014-02-18 13:10 -0800
      Re: Bad Code Snippet of the Day Chris Angelico <rosuav@gmail.com> - 2014-02-19 08:21 +1100

#66637 — Bad Code Snippet of the Day

I call this "Russian Exception Roulette". It came about because of
some discussions on python-ideas regarding the new PEP 463 and
exception handling.

try:
    exc = getattr(__builtins__,random.choice(list(filter(lambda x:
x.endswith("Error"),dir(__builtins__)))))
    f()
except exc:
    print("You win!")


Given a function f(), defined elsewhere, what will this do?

Note that this was developed on Python 3.4, and some of the details
may be different on other versions (especially 2.x).

ChrisA

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#66645

On Tuesday, February 18, 2014 10:47:15 AM UTC-6, Chris Angelico wrote:
> I call this "Russian Exception Roulette". It came about because of
> some discussions on python-ideas regarding the new PEP 463 and
> exception handling.
> try:
> 
>     exc = getattr(__builtins__,random.choice(list(filter(lambda x:
> x.endswith("Error"),dir(__builtins__)))))
>     f()
> except exc:
>     print("You win!")
> Given a function f(), defined elsewhere, what will this do?

For get about "f()", it will throw a NameError since "random" 
was not imported. 

Beyond that this code (either conscientiously or unconsciously)
exposes the onerous and obfuscation of a language design
that coddles a global function nightmare paradigm over the
elegance of true OOP -- talk about cutting off your nose
just to spite your face!

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#66648

On Wed, Feb 19, 2014 at 8:10 AM, Rick Johnson
<rantingrickjohnson@gmail.com> wrote:
> Beyond that this code (either conscientiously or unconsciously)
> exposes the onerous and obfuscation of a language design
> that coddles a global function nightmare paradigm over the
> elegance of true OOP -- talk about cutting off your nose
> just to spite your face!

Humour me, Rick. Pretend I've been awake for 22 hours straight, am
wired on sleep-deprivation and energy drinks, and have no idea what
you're talking about. How exactly does the ability to dynamically
determine which exception to catch coddle a functional paradigm, and
how is it not object oriented?

Also, my face doesn't much care for my nose. It gets in the way. If I
cut my nose off, my face would be happy with me.

ChrisA

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