On Wed, Mar 25, 2015 at 1:51 PM, Manuel Graune <manuel.gra...@koeln.de> wrote:
> Joel Goldstick <joel.goldst...@gmail.com> writes:
>
>> On Wed, Mar 25, 2015 at 1:29 PM, Manuel Graune <manuel.gra...@koeln.de>
>> wrote:
>>>
>>> def test1(a, b, condition="True"):
>>> for i,j in zip(a,b):
>>> c=i+j
>>> if eval(condition):
>>> print("Foo")
>>>
>> I'm not sure I understand your question, but condition will evaluate
>> to True or False regardless, so:
>> if condition:
>> print ("Foo")
>> else:
>> print ("Bar")
>>
>
> The point is (see examples below) to specify the condition that is to be
> evaluated when calling the function (as opposed to when stating the function).
>
>> eval can be dangerous as someone could put some unknown command with
>> side effects in condition
>>
>
> I know that. That's why I'm looking for an alternative. ;-)
Oh, now I see. Do you know about this:
https://docs.python.org/2/library/ast.html#ast.literal_eval
>
>>> test1([0,1,2,3],[1,2,3,4],"i+j >4")
>>> print("Bar")
>>> test1([0,1,2,3],[1,2,3,4],"c >4")
>>> print("Bar")
>>> test1([0,1,2,3],[1,2,3,4],"a[i] >2")
>>>
>>> Resulting in
>>>
>>> Foo
>>> Foo
>>> Bar
>>> Foo
>>> Foo
>>> Bar
>>> Foo
>
> Regards,
>
> Manuel
>
> --
> A hundred men did the rational thing. The sum of those rational choices was
> called panic. Neal Stephenson -- System of the world
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--
Joel Goldstick
http://joelgoldstick.com
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