A lot of times 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 enumerate object. This enumerate object can then be used directly in for loops or be converted into a list of tuples using list() method.
Syntax:
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 function l1 = [ "eat" , "sleep" , "repeat" ] s1 = "geek" # creating enumerate objects obj1 = enumerate (l1) obj2 = enumerate (s1) print ( "Return type:" , type (obj1)) print ( list ( enumerate (l1))) # changing start index to 2 from 0 print ( 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 loops l1 = [ "eat" , "sleep" , "repeat" ] # printing the tuples in object directly for ele in enumerate (l1): print (ele) print # changing index and printing separately for count,ele in enumerate (l1, 100 ): print (count,ele) |
Output:
(0, 'eat') (1, 'sleep') (2, 'repeat') 100 eat 101 sleep 102 repeat
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