CODEWITHSUNDEEP
pythonnested-for-loop
aye decoder
aye decoder

Reputation: 127

Printing a for loop inside a for loop correctly in Python

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.

Upvotes: 1

Views: 251

Answers (3)

Yannick Durindel
Yannick Durindel

Reputation: 9

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')

Upvotes: 1

rviretual_001
rviretual_001

Reputation: 53

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])

Upvotes: 2

mcsoini
mcsoini

Reputation: 6642

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"), ...]

Upvotes: 4

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