Python Enumerate

Python Enumerate

Last updated on 22nd Sep 2020, Artciles, Blog

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The enumerate() method adds counter to an iterable and returns it (the enumerate object).

The syntax of enumerate() is:

enumerate(iterable, start=0)

enumerate() Parameters

enumerate() method takes two parameters:

  • iterable – a sequence, an iterator, or objects that supports iteration
  • start (optional) – enumerate() starts counting from this number. If start is omitted, 0 is taken as start.
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Return Value from enumerate()

enumerate() method adds counter to an iterable and returns it. The returned object is an enumerated object.

We can convert enumerate objects to list and tuple using list() and tuple() method respectively.

Example 1:

  • grocery = [‘bread’, ‘milk’, ‘butter’]

    enumerateGrocery = enumerate(grocery)

     

    print(type(enumerateGrocery))

     

    # converting to list

    print(list(enumerateGrocery))

     

    # changing the default counter

    enumerateGrocery = enumerate(grocery, 10)

    print(list(enumerateGrocery))

Output

<class ‘enumerate’>

[(0, ‘bread’), (1, ‘milk’), (2, ‘butter’)]

[(10, ‘bread’), (11, ‘milk’), (12, ‘butter’)]

Example 2: 

  • Looping Over an Enumerate object

    grocery = [‘bread’, ‘milk’, ‘butter’]

     

    for item in enumerate(grocery):

      print(item)

     

    print(‘\n’)

    for count, item in enumerate(grocery):

      print(count, item)

     

    print(‘\n’)

    # changing default start value

    for count, item in enumerate(grocery, 100):

      print(count, item)

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Output

(0, ‘bread’)

(1, ‘milk’)

(2, ‘butter’)

0 bread

1 milk

2 butter

100 bread

101 milk

102 butter

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