Looping idioms in Python ref: http://qiita.com/giwa/items/d453017f8ac6db34a7db

file0.txt

>>> # Let's create lists

>>> colors = "red blue green yellow".split()
>>> colors
['red', 'blue', 'green', 'yellow']

file1.txt

>>> for i in [0, 1, 2, 3]:
    print colors[i]


red
blue
green
yellow

file10.txt

>>> enumerate(colors)
<enumerate object at 0x106e55690>
>>> list(enumerate(colors))
[(0, 'red'), (1, 'blue'), (2, 'green'), (3, 'yellow')]

file11.txt

>>> for i, color in enumerate(colors):
    print i, "-->", color


0 --> red
1 --> blue
2 --> green
3 --> yellow

file12.txt

>>> for color in sorted(colors):
     print color

blue
green
red
yellow

file13.txt

>>> for color in sorted(colors, reverse=True):
     print color

yellow
red
green
blue

file14.txt

>>> for color in sorted(colors, key=len):
     print color

red
blue
green
yellow

file2.txt

>>> range(4)
[0, 1, 2, 3]
>>> for i in range(len(colors)):
    print colors[i]


red
blue
green
yellow

file3.txt

>>> for i in colors:
    print i


red
blue
green
yellow

file4.txt

>>> for i in [3, 2, 1, 0]:
    print colors[i]


yellow
green
blue
red

file5.txt

>>> range(3, 0, -1)
[3, 2, 1]
>>> range(3, -1, -1)
[3, 2, 1, 0]
>>> range(len(colors) - 1, -1, -1)
[3, 2, 1, 0]

file6.txt

>>> for i in  range(len(colors) - 1, -1, -1):
    print colors[i]


yellow
green
blue
red

file7.txt

>>> for i in reversed(colors):
    print i


yellow
green
blue
red

file8.txt

>>> for color in colors[::-1]:
     print color

yellow
green
blue
red

file9.txt

>>> for i in range(len(colors)):
    print i, "-->", colors[i]


0 --> red
1 --> blue
2 --> green
3 --> yellow