[Tutor] Question regarding the len function of a list while using a loop

[Ben Markwell]

Could somebody explain to me why the code I used to complete this exercise 
doesn't work. 
And how do you send an integer to len?

Thanks

Ben

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*As an exercise, write a loop that traverses a list and prints the length of 
each element. What happens if you send an integer to len?

*>>> foo = ['spam!', 1, ['brie', 'cheddar', 'swiss'], [1, 2, 3]]
>>> i = 0
>>> while i < len(foo):
print len(foo[i])
i = i+1


5

Traceback (most recent call last):
File "<pyshell#28>", line 2, in -toplevel-
print len(foo[i])
TypeError: len() of unsized object
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