Python FOR LOOPS

What the fuck is with Python's for loops.

What's the difference between:

for i in list[0]:

for i in list[0:]:

for i in list[:0]:

>>4
The First one wIll probably raise a TypeError, depending on whether or nOt the first element of "list" is iterable.
The seCond one will iterate through every element of list.
The third one will skip the body of the loop since list[:0] is empty.