[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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