Counting item number in Python 'for'? [duplicate]

Question

Possible Duplicate:
for x in y, type iteration in python. Can I find out what iteration I'm currently on?
Iteration count in python?

Kind of hard to explain, but when I run something like this:

fruits = ['apple', 'orange', 'banana', 'strawberry', 'kiwi']

for fruit in fruits:
    print fruit.capitalize()

It gives me this, as expected:

Apple
Orange
Banana
Strawberry
Kiwi

How would I edit that code so that it would "count" the amount of times it's performing the for, and print this?

1 Apple
2 Orange
3 Banana
4 Strawberry
5 Kiwi

possible duplicate of for x in y, type iteration in python. Can I find out what iteration I'm currently on? and Iteration count in python? and Identify which iteration you are on in a loop in python. — Felix Kling
– Felix Kling, Commented Jun 2, 2012 at 22:29

Levon · Accepted Answer · 2012-06-02 22:35:37Z

6

for i,fruit in enumerate(fruits, 1):
    print i, fruit.capitalize()

will do what you want and print:

1 Apple
2 Orange
3 Banana
4 Strawberry
5 Kiwi

By default enumerate() will start generating an index with 0 if not specified, but you can specify the starting value as shown.

edited Jun 2, 2012 at 22:35

answered Jun 2, 2012 at 22:28

Levon

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matt b · Accepted Answer · 2012-06-02 22:30:09Z

0

Ignoring enumerate(iterable), you could just count yourself:

i = 0
for fruit in fruits:
    i += 1
    print i, fruit.capitalize()

answered Jun 2, 2012 at 22:30

matt b

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2 Comments

Gareth Latty Over a year ago

Why do it manually in an uglier way? -1. Don't reinvent the wheel.

matt b Over a year ago

I wasn't suggesting this was a good way, but I wanted to point out to the OP how you could simply modify the existing code to accomplish what he wants - that it isn't a huge leap from what he had to what he wants, and to show what enumerate is essentially doing for you. But I guess we downvote less-than-optimal answers these days

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