Enumerate() in Python

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.

enumerate(iterable, start=0)
Iterable: any object that supports iteration
Start: the index value from which the counter is 
to be started, by default it is 0 
# 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))
Return type: 
[(0, 'eat'), (1, 'sleep'), (2, 'repeat')]
[(2, 'g'), (3, 'e'), (4, 'e'), (5, 'k')]

Using Enumerate object in loops

# 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
# changing index and printing separately
for count,ele in enumerate(l1,100):
	print count,ele

(0, 'eat')
(1, 'sleep')
(2, 'repeat')

100 eat
101 sleep
102 repeat

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