Loops

for

>>> l = [111, 222, 333, 444]
>>> for item in l:
...     print item
...
111
222
333
444

while

Fibonacci series:

>>> a, b = 0, 1
>>> while b < 10:
...     print b
...     a, b = b, a+b
...
1
1
2
3
5
8

Using Range:

>>> range(10)
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

Other range uses:

>>> range(5, 10)
[5, 6, 7, 8, 9]
>>> range(0, 10, 3)
[0, 3, 6, 9]

Enumerate:

>>> for i, v in enumerate(['tic', 'tac', 'toe']):
...     print i, v
..................
0 tic
1 tac
2 toe

Dictionaries:

>>> knights = {'gallahad': 'the pure', 'robin': 'the brave'}
>>> for k, v in knights.iteritems():
...     print k, v
..................
gallahad the pure
robin the brave