To iterate through a list you can use
for x in ['one', 'two', 'three', 'four']: print(x)
This will print out the elements of the list:
one two three four
range function generates numbers which are also often used in a for loop.
for x in range(1, 6): print(x)
The result will be a special range sequence type in python >=3 and a list in python <=2. Both can be looped through using the for loop.
1 2 3 4 5
If you want to loop though both the elements of a list and have an index for the elements as well, you can use Python's
for index, item in enumerate(['one', 'two', 'three', 'four']): print(index, '::', item)
enumerate will generate tuples, which are unpacked into
index (an integer) and
item (the actual value from the list). The above loop will print
(0, '::', 'one') (1, '::', 'two') (2, '::', 'three') (3, '::', 'four')
Iterate over a list with value manipulation using
lambda, i.e. apply lambda function on each element in the list:
x = map(lambda e : e.upper(), ['one', 'two', 'three', 'four']) print(x)
['ONE', 'TWO', 'THREE', 'FOUR'] # Python 2.x
NB: in Python 3.x
map returns an iterator instead of a list so you in case you need a list you have to cast the result
print(list(x)) (see http://www.riptutorial.com/python/example/8186/map-- in http://www.riptutorial.com/python/topic/809/incompatibilities-moving-from-python-2-to-python-3 ).