Python: concatenate string and int in a loop

Question

I have a list of integers and I want to concatenate them in a loop.

This is what I have so far

a = [3, 4, 6]

temp = []
for i in a:
    query = 'Case:' + str(i)
    temp.append(query)

print(' OR '.join(temp))

>>> Case:3 OR Case:4 OR Case:6

Is there a better way to write this?

A bit shorter: ' OR '.join('Case:' + str(i) for i in a)

dazedconfused
– dazedconfused

2015-08-07 02:18:02 +00:00
Commented Aug 7, 2015 at 2:18 — dazedconfused
– dazedconfused, Commented Aug 7, 2015 at 2:18

Anand S Kumar · Accepted Answer · 2015-08-07 02:20:40Z

2

Yes, you can use generator expression and str.join ,

' OR '.join('Case: {}'.format(i) for i in a)

Example/Demo -

>>> a = [3, 4, 6]
>>> ' OR '.join('Case: {}'.format(i) for i in a)
'Case: 3 OR Case: 4 OR Case: 6'

answered Aug 7, 2015 at 2:20

Anand S Kumar

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5 Comments

Anand S Kumar Over a year ago

yea , though only a slight difference :) .

Thane Plummer Over a year ago

Ditto -- beat me to it by a minute!

karthikr Over a year ago

Anyway.. enjoy.. I deleted my answer. the net result is the same.. :)

Cryssie Over a year ago

Thanks everyone who answered! This is great! This is what I am looking for. I just didn't realised it's called generator expression.

Bacon Over a year ago

I thought I'd make an answer just because I love comprehensions :p

Joshua K · Accepted Answer · 2015-08-07 02:30:33Z

2

You can also use map and lambda expressions:

temp = map(lambda x: 'Case: '+str(x), a)

answered Aug 7, 2015 at 2:30

Joshua K

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2 Comments

Thane Plummer Over a year ago

This returns a list not a string. You can convert it to the required output by chaining it to a join like this: ' '.join(map(lambda i: 'Case:' + str(i) + ' OR', a))

Joshua K Over a year ago

I took his code from above and split the converting and joining in two parts like in his code. That is only the line für converting (translation of his for loop).#

Bacon · Accepted Answer · 2015-08-10 01:23:15Z

1

You could also use a comprehension:

>>> a = [3, 4, 6]
>>> ' OR '.join([ "Case " + str(x) for x in a ])
'Case 3 OR Case 4 OR Case 6'

edited Aug 10, 2015 at 1:23

answered Aug 7, 2015 at 2:45

Bacon

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Comments

Thane Plummer · Accepted Answer · 2015-08-07 14:20:19Z

0

Completing the idea from @Joshua K for using map and lambda (although I think the list comprehension is a better solution):

>>> a = [3, 4, 6]
>>> 'OR '.join(map(lambda i: 'Case:' + str(i) + ' ', a))
Case:3 OR Case:4 OR Case:6

answered Aug 7, 2015 at 14:20

Thane Plummer

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