How to print index: value when loop a list in Python

Question

In C#:

List<string> stringList = new List<string>() { "AAAA", "BBBB", "CCCC", "DDDD", "EEEE" };
for (int i = 0; i < stringList.Count; i++)
    Console.WriteLine(i + ": " + stringList[i]);

Output:

0: AAAA
1: BBBB
2: CCCC
3: DDDD
4: EEEE

In Python:

stringList = ["AAAA", "BBBB", "CCCC", "DDDD", "EEEE"]
for i, string in enumerate(stringList):
    print(i + ": " + string)

I want output same as the output above, but there is error:

TypeError: unsupported operand type(s) for +: 'int' and 'str'

i is not a string, but an int. Use str(i)

RoadRunner
– RoadRunner

2019-10-21 04:37:20 +00:00
Commented Oct 21, 2019 at 4:37 — RoadRunner
– RoadRunner, Commented Oct 21, 2019 at 4:37

Shishir Naresh · Accepted Answer · 2019-10-21 04:39:19Z

4

Try the below code, Hope this helps:

stringList = ["AAAA", "BBBB", "CCCC", "DDDD", "EEEE"]
for i, string in enumerate(stringList):
    print(i ,": ", string)

Ouput will be :

0 :  AAAA
1 :  BBBB
2 :  CCCC
3 :  DDDD
4 :  EEEE

answered Oct 21, 2019 at 4:39

Shishir Naresh

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2 Comments

gtalarico Over a year ago

Or print("{0}: {1}".format(i,string)) to autmaitilly string format index integer

Shishir Naresh Over a year ago

@gtalarico , yes you can also use this method. It is upto your convenience. :)

Emma Marcier · Accepted Answer · 2019-10-21 05:07:16Z

4

I guess your code is just fine, maybe just a bit modify it:

stringList = ["AAAA", "BBBB", "CCCC", "DDDD", "EEEE"]
for i, string in enumerate(stringList):
    print(f'{i}:  {string}')

Output

0:  AAAA
1:  BBBB
2:  CCCC
3:  DDDD
4:  EEEE

You can also write with list comprehension, if you like:

stringList = ["AAAA", "BBBB", "CCCC", "DDDD", "EEEE"]
[print(f'{i}:  {string}') for i, string in enumerate(stringList)]

Or you can simply build your output first and then print only once:

stringList = ["AAAA", "BBBB", "CCCC", "DDDD", "EEEE"]
output = ''
for i, string in enumerate(stringList):
    output += f'{i}: {string}\n'

print(output)

edited Oct 21, 2019 at 5:07

answered Oct 21, 2019 at 4:45

Emma Marcier

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Comments

Tim Biegeleisen · Accepted Answer · 2019-10-21 04:39:21Z

0

Just use a while loop:

stringList = ["AAAA", "BBBB", "CCCC", "DDDD", "EEEE"]
i = 0
while i < len(stringList):
    print(str(i) + ": " + stringList[i])
    i = i + 1

edited Oct 21, 2019 at 4:39

answered Oct 21, 2019 at 4:38

Tim Biegeleisen

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2 Comments

RoadRunner Over a year ago

Forgetting i += 1 at the end. Also, whats wrong with a for loop? In this case the list is fixed, so a for loop is probably the better option. A while loop is better in situations where you don't know how many elements your going to process.

Tim Biegeleisen Over a year ago

@RoadRunner I don't know what the most "Pythonic" way to do this is, but my answer is probably closest to the for loop syntax used in the OP's quoted C# code.

akkapolk · Accepted Answer · 2019-10-25 07:57:14Z

0

I must use str() as per @RoadRunner comment, it will look like the C# which I want

stringList = ["AAAA", "BBBB", "CCCC", "DDDD", "EEEE"]
for i in range(len(stringList)):
    print(str(i) + ": " + stringList[i])

or

stringList = ["AAAA", "BBBB", "CCCC", "DDDD", "EEEE"]
for i, string in enumerate(stringList):
    print(str(i) + ": " + string)

edited Oct 25, 2019 at 7:57

answered Oct 24, 2019 at 7:21

akkapolk

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