Printing a for loop inside a for loop correctly in Python

Question

Hope someone can help me out here. I am using a for loop inside a for loop in Python. That is a nested-for-loop and I want to map the results together once. At the moment the results are displayed correctly once and then incorrectly repeated. This is my code snippet.

for country in ["USA", "Nigeria", "Germany", "India", "Britain"]:
    for code in ["+1", "+234", "+49", "+91", "+44"]:
        print(country, code)
        
print("Done")

The result I am trying to achieve is this one.

USA +1
Nigeria +234
Germany +49
India +91
Britain +44
Done!

But what I am getting at the moment is this one.

USA +1
USA +234
USA +49
USA +91
USA +44
Nigeria +1
Nigeria +234
Nigeria +49
Nigeria +91
Nigeria +44
Germany +1
Germany +234
Germany +49
Germany +91
Germany +44
India +1
India +234
India +49
India +91
India +44
Britain +1
Britain +234
Britain +49
Britain +91
Britain +44
Done

Is there a way I can improve it and get the desired result? I will appreciate your help.

Have you seen stackoverflow.com/questions/48053979/print-2-lists-side-by-side? — Haren S
– Haren S, Commented Jul 15, 2021 at 13:29

mcsoini · Accepted Answer · 2021-07-15 13:34:54Z

4

You could zip the countries and codes to match the corresponding elements:

countries = ["USA", "Nigeria", "Germany", "India", "Britain"]
codes = ["+1", "+234", "+49", "+91", "+44"]

for country, code in zip(countries, codes):
    print(country, code)

(or for nicer formatting: print(f"{country} {code}")).

When do loop inside the loop you print each code for each country, which is what you see in your current output.

Zip does exactly what it sounds like, i.e. it acts as a zipper:

list(zip(countries, codes))

gives

[("USA", "+1"), ("Nigeria", "+234"), ...]

edited Jul 15, 2021 at 13:34

answered Jul 15, 2021 at 13:29

mcsoini

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Comments

rviretual_001 · Accepted Answer · 2021-07-15 13:34:57Z

2

This will work:

countries = ["USA", "Nigeria", "Germany", "India", "Britain"];
codes = ["+1", "+234", "+49", "+91", "+44"];

for i in range(len(countries)):
    print(countries[i], codes[i])

answered Jul 15, 2021 at 13:34

rviretual_001

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Comments

mcsoini · Accepted Answer · 2021-07-15 13:35:39Z

1

I'm not sure it's what you're waiting for but here is a code that send the result you're waiting for :

country = ["USA", "Nigeria", "Germany", "India", "Britain"]
code = ["+1", "+234", "+49", "+91", "+44"]
for i in range(4):
    print(country[i], code[i])
print('done')

edited Jul 15, 2021 at 13:35

mcsoini

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answered Jul 15, 2021 at 13:34

Yannick Durindel

96 bronze badges

2 Comments

mcsoini Over a year ago

Note that range(4) is [0, 1, 2, 3], i.e. one short

aye decoder Over a year ago

Very much appreciated. It helps.

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