Python and Ruby

Nobody nobody at nowhere.com
Tue Feb 2 03:03:18 CET 2010


On Sun, 31 Jan 2010 22:36:32 +0000, Steven D'Aprano wrote:

>> for example, in if you have a function 'f' which takes two parameters to
>> call the function and get the result you use:
>> 
>>  f 2 3
>> 
>> If you want the function itself you use:
>> 
>>    f
> 
> How do you call a function of no arguments?

There's no such thing. All functions take one argument and return a value.

As functions don't have side-effects, there is seldom much point in having
a function with no arguments or which doesn't return a value. In cases
where it is useful (i.e. a value must have function type), you can use the
unit type "()" (essentially a zero-element tuple), e.g.:

	f () = 1
or:
	f x = ()




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