How to use iter function to loop through a list until a certain match is found [closed]

Question

I frankly don't understand how to use the iter(o[,sentinel]) function and I'm trying to loop through lst(a list) and print all the values until 'kdawg'

Code:

lst = [2,3,4,'kdawg',5,6,'hey']

class foo:
    def __str__(self):
        return str(lst)

for i in iter(foo,'kdawg'):
    print i

I expect it to return:

2
3
4

However it returns the whole list continuously:

[2,3,4,'kdawg',5,6,'hey']

Why doesn't my iter() function work?

Answer 1

Use itertools.takewhile():

>>> from itertools import takewhile
>>> 
>>> l = [2,3,4,'kdawg',5,6,'hey']
>>> 
>>> for i in takewhile(lambda s: s != 'kdawg', l):
...     print i
... 
2
3
4