Supply condition in function call

[Grant Edwards]

On 2015-03-25, Ian Kelly <ian.g.kelly at gmail.com> wrote:
> On Wed, Mar 25, 2015 at 11:29 AM, Manuel Graune <manuel.graune at koeln.de> wrote:
>
>> I'm looking for a way to supply a condition to an if-statement inside a
>> function body when calling the function. I can sort of get what I want
>> with using eval [...]
>
> Pass the condition as a function.
>
> def test1(a, b, condition=lambda i, j: True):
>     for i,j in zip(a,b):
>         c=i+j
>         if condition(i, j):
>             print("Foo")
>
> test1([0,1,2,3],[1,2,3,4], lambda i, j: i+j > 4)
> # etc.

FWIW, back in the day such a function was referred to as a "thunk"
(particularly if it was auto-generated by a compiler that used
pass-by-name instead of pass-by-value or pass-by-reference):

  http://en.wikipedia.org/wiki/Thunk

Dunno if people still use that term or not.

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