python nested for loop iteration

Question

I would like the inner for loop to give me one value and goes on to the next iteration for each outer loop. Appreciate your responds.

Currently the result:

Personal NameJohn
Personal NamePeter
Personal Name123456
ID #John
ID #Peter
ID #123456
Emergency contactJohn
Emergency contactPeter
Emergency contact123456

Result should just be:

ID #123456
Personal NameJohn

Emergency contactPeter

employees={'ID #','Personal Name','Emergency contact'}

excel={'123456',
   'John',
   'Peter'}

for key in employees:
    for value in excel:
       print(key + value)

Azsgy · Accepted Answer · 2018-04-05T20:36:17.153

5

Use zip to iterate over two objects at the same time.

note: you are using sets (created using {"set", "values"}) here. Sets have no order, so you should use lists (created using ["list", "values"]) instead.

for key, value in zip(employees, excel):
    print(key, value)

edited Apr 05 '18 at 20:36

answered Apr 05 '18 at 20:24

Azsgy

3,139
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>>> type({'a','b'}) – Chrispresso Apr 05 '18 at 20:27
what I meant is that using `{}` creates a set instead of a list – Azsgy Apr 05 '18 at 20:27
`val = {}` creates and empty dictionary, not set. For an empty set, use `val = set()` – Ajax1234 Apr 05 '18 at 20:35

score 2 · Answer 2 · answered Apr 05 '18 at 20:24

You can use zip after changing the type of your input data. Sets order their original content, thus producing incorrect pairings:

employees=['ID #','Personal Name','Emergency contact']
excel=['123456', 'John','Peter']
new_data = [a+b for a, b in zip(employees, excel)]

Output:

['ID #123456', 'Personal NameJohn', 'Emergency contactPeter']

wohe1 · Answer 3 · 2018-04-05T20:35:08.580

0

First of all, use square brackets [] instead of curly brackets {}. Then you could use zip() (see other answers) or use something very basic like this:

for i in range(len(employees)):
    print(employees[i], excel[i])

edited Apr 05 '18 at 20:35

answered Apr 05 '18 at 20:28

wohe1

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7
26

Indeed, I've changed it (I'm not native english) – wohe1 Apr 05 '18 at 20:35

python nested for loop iteration

3 Answers3