[Tutor] List comprehension possible with condition statements?

[C.T. Matsumoto]

Dave Angel wrote:
> Jojo Mwebaze wrote:
>> Hi There,
>>
>> i would like to implement the following in lists
>>
>> assuming
>>
>> x = 3
>> y = 4
>> z = None
>>
>> i want to create a dynamic list such that
>>
>> mylist = [ x , y, z ] ,   if z in not None
>>
>> if z is None then
>>
>> mylist = [x,y]
>>
>> Anyhelp!
>>
>> cheers
>>
>> Jojo
>>
>>   
>
> Are there any constraints on x and y ?  If you want to throw out all 
> None values, then it's a ready problem.  You try it, and if it doesn't 
> quite work, post the code. We'll try to help.
>
> But if only the third value is special, then there's little point in 
> making a comprehension of one value.  Just conditionally append the z 
> value to the list containing x and y.
>
> DaveA
>
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Hello,

I wrote a solution which isn't correct.

 >>> [i for i in mylist if i]
[3, 4]


The if condition should test like the other examples given to the list.

 >>> [i for i in mylist if i != None]
[3, 4]

'if i' would also leave out the integer 0.

T