[Python-ideas] Infix application of binary functions

[Dag Odenhall]

tor 2010-07-22 klockan 01:33 +0200 skrev Mathias Panzenböck:
> Then what about:
> 	obj $isinstance Iterable
> or
> 	obj $isinstance$ Iterable
> or
> 	obj *isinstance Iterable
> or
> 	obj isinstance? Iterable
> 
> These don't use the backtick charackter (wich on some setups even is a unicode char not from 7bit 
> ascii).

I like the question mark, although it is only useful for predicates. I
haven't considered if infix is useful for anything other than
predicates, though.

Another possibility is a keyword, maybe "of":

    obj isinstance of Iterable or obj hasattr of '__iter__'

But better then would be a keyword that already exists and makes sense
for this use. A character such as the question mark is probably best,
just noting the possibility of a keyword for completeness sake.

An example of a non-predicate infix might be str.format:

    'Hello {}' str.format? 'World'

Here, the question mark makes less sense.