‘enumerate’ Function

What we usually do if we want to print the content of a list with its index number?

>>> i = 0

>>> for item in items:

… print index, item

… i+= 1

There is actually a short cut to do this. Python has an function called ‘enumerate’. The enumerate function takes a list and returns a (index, item) pair.

>>> print list(enumerate(items))

The reason because we are using a list conversion is, enumerate function is a generator function, which produces one pair at a time. But print cannot be applied to such a function because it print result at once.

As enumerate is a generator function we can apply next() on it.

>>> items = [‘a’, ‘b’, ‘c’, ‘d’]

>>> e= enumerate(items)

>>> e.next()

(0, ‘a’)

>>> e.next()

(0, ‘b’)


About Odol Shinu

I've completed my B Tech in Information Technology in 2010 from Government Engineering College Sreekrishnapuram Palakkad under Calicut University.

Posted on September 5, 2010, in Python. Bookmark the permalink. Leave a comment.

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