Loop through list with both content and index
Use the enumerate
built-in function: http://docs.python.org/library/functions.html#enumerate
Use enumerate()
:
>>> S = [1,30,20,30,2]
>>> for index, elem in enumerate(S):
print(index, elem)
(0, 1)
(1, 30)
(2, 20)
(3, 30)
(4, 2)
Like everyone else:
for i, val in enumerate(data):
print i, val
but also
for i, val in enumerate(data, 1):
print i, val
In other words, you can specify as starting value for the index/count generated by enumerate() which comes in handy if you don't want your index to start with the default value of zero.
I was printing out lines in a file the other day and specified the starting value as 1 for enumerate()
, which made more sense than 0 when displaying information about a specific line to the user.
enumerate
is what you want:
for i, s in enumerate(S):
print s, i