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From: Devin Jeanpierre <jeanpierreda@gmail.com>
Date: Fri, 6 Feb 2015 05:09:05 -0800
Subject: Re: meaning of: line, =
To: Rustom Mody <rustompmody@gmail.com>
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Xref: csiph.com comp.lang.python:85286

Sorry for late reply, I somehow missed this email.

On Thu, Feb 5, 2015 at 8:59 AM, Rustom Mody <rustompmody@gmail.com> wrote:
> The reason I ask: I sorely miss haskell's pattern matching in python.
>
> It goes some way:
>
>>>> ((x,y),z) = ((1,2),3)
>>>> x,y,z
> (1, 2, 3)
>
> But not as far as I would like:
>
>>>> ((x,y),3) = ((1,2),3)
>   File "<stdin>", line 1
> SyntaxError: can't assign to literal
>>>>
>
> [Haskell]
>
> Prelude> let (x, (y, (42, z, "Hello"))) = (1, (2, (42, 3, "Hello")))
> Prelude> (x,y,z)
> (1,2,3)

Yeah, but Haskell is ludicrous.

Prelude> let (x, 2) = (1, 3)
Prelude>

Only non-falsifiable patterns really make sense as the left hand side
of an assignment in a language without exceptions, IMO. Otherwise you
should use a match/case statement. (Of course, Python does have
exceptions...)

-- Devin