On Wed, Mar 25, 2015 at 11:29 AM, Manuel Graune <manuel.gra...@koeln.de> wrote:
> Hi,
>
> 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 (see code below) but I would like to achieve this in a
> safer way. If there is a solution which is safer while being
> less flexible, that would be fine. Also, supplying the condition as a
> string is not necessary. What I want to do is basically like this:
>
> def test1(a, b, condition="True"):
> for i,j in zip(a,b):
> c=i+j
> if eval(condition):
> print("Foo")
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.
If you find lambdas confusing and prefer named functions, those will
work just as well.
def i_plus_j_gt_4(i, j):
return i + j > 4
test1([0,1,2,3],[1,2,3,4], i_plus_j_gt_4)
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