Re: [Python-ideas] Infix application of binary functions

On 07/22/2010 01:17 AM, Chris Rebert wrote:

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On Wed, Jul 21, 2010 at 3:37 PM, Dag Odenhall  wrote:

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It could help readability if binary (arity of 2) functions could be applied infix with some syntax. For example, borrowing from Haskell, the backtick could be reintroduced for this purpose.

Good examples for this are isinstance and hasattr:

   if some_object `isinstance` Iterable:        ...    elif some_object `hasattr` '__iter__':

Already proposed (by me) and rejected by the BDFL:

http://mail.python.org/pipermail/python-ideas/2007-January/000054.html

On Wed, Jul 21, 2010 at 4:33 PM, Mathias Panzenböck wrote: Then what about: <snip>        obj *isinstance Iterable

How would the parser distinguish that from multiplication?

or        obj isinstance? Iterable

That would look odd for non-interoggative binary functions: z = x cartesianProduct? y

These don't use the backtick charackter (wich on some setups even is a unicode char not from 7bit ascii).

Not using backtick definitely makes the proposal more viable. (Personally I <3 backtick though.) Cheers, Chris