Enumerate() in Python
Often, when dealing with iterators, we also get a need to keep a count of iterations. Python eases the programmers’ task by providing a built-in function enumerate() for this task.
Enumerate() method adds a counter to an iterable and returns it in a form of enumerating object. This enumerated object can then be used directly for loops or converted into a list of tuples using the list() method.
Syntax:
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enumerate(iterable, start=0)
Parameters:
Iterable: any object that supports iteration
Start: the index value from which the counter is
to be started, by default it is 0
Python3
#python# Python program to illustrate# enumerate functionl1 = ["eat","sleep","repeat"]s1 = "geek"# creating enumerate objectsobj1 = enumerate(l1)obj2 = enumerate(s1)print ("Return type:",type(obj1))print (list(enumerate(l1)))# changing start index to 2 from 0print (list(enumerate(s1,2))) |
Output:
Return type: < type 'enumerate' > [(0, 'eat'), (1, 'sleep'), (2, 'repeat')] [(2, 'g'), (3, 'e'), (4, 'e'), (5, 'k')]
Using Enumerate object in loops:
Python3
# Python program to illustrate# enumerate function in loopsl1 = ["eat","sleep","repeat"]# printing the tuples in object directlyfor ele in enumerate(l1): print (ele)print# changing index and printing separatelyfor count,ele in enumerate(l1,100): print (count,ele)#getting desired output from tuplefor count,ele in enumerate(l1): print(count) print(ele) |
Output:
(0, 'eat') (1, 'sleep') (2, 'repeat') 100 eat 101 sleep 102 repeat 0 eat 1 sleep 2 repeat
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