Loop a list with a list of lists in pairs-CodePudding

EDITED: In me trying to exemplify the coding issue I made a mistake in regards to my desired outcome. I have updated the outcome to my ACTUAL desired outcome.

I have a list of lists called list_of_lists_1 that I whish to loop over in parallel with a sister list (if that is a term in coding) called list_of_lists_2, and a third list called person_list. list_of_lists_1 and list_of_lists_2 have the same number of elements both in total and within each list of lists. Each element in person_list should loop with its respective list in list_of_lists_1 and list_of_lists_2 i.e. person_a will loop in tandem with lists [1, 3, 5] and [2, 4, 6]. Just as persin_b will loop with ["7", "9", "11"] and ["8", "10", "12"] etc.

# create lists
list_of_lists_1 = [["1", "3", "5"], ["7", "9", "11"], ["13", "15", "17"]]
list_of_lists_2 = [["2", "4", "6"], ["8", "10", "12"], ["14", "16", "18"]]
person_list = ["person_a", "person_b", "person_c"]

I have tried the following code. However, the output only amounts to about 50 pct. of the desired outcome.

# loop
for i in range(0, len(list_of_lists_1)):

    outcome = person_list[i]   list_of_lists_1[i][i]   list_of_lists_2[i][i]
    
    # some functions and other interesting stuff!

    print(outcome)

person_a12
person_b910
person_c1718

# desired outcome (Has been edited)
person_a12
person_a34
person_a56
person_b78
person_b910
person_b1112
person_c1314
person_c1516
person_c1718

How would I achieve the desired outcome?

Thank you.

CodePudding user response：

Use zip() to loop over lists in parallel.

Then you can use a nested loop to combine the elements of the nested lists in list_of_lists_X.

Given:

list_of_lists_1 = [["1", "3", "5"], ["7", "9", "11"], ["13", "15", "17"]]
list_of_lists_2 = [["2", "4", "6"], ["8", "10", "12"], ["14", "16", "18"]]
person_list = ["person_a", "person_b", "person_c"]

Your result can be constructed via:

for suffixes_1, suffixes_2, name in zip(list_of_lists_1, list_of_lists_2, person_list):
    for s1, s2 in zip(suffixes_1, suffixes_2):
        outcome = name   s1   s2
        print(outcome)

CodePudding user response：

@Barmar's solution is a little more condensed but I'll post this anyway.

list_of_lists_1 = [["1", "3", "5"], ["7", "9", "11"], ["13", "15", "17"]]
list_of_lists_2 = [["2", "4", "6"], ["8", "10", "12"], ["14", "16", "18"]]
person_list = ["person_a", "person_b", "person_c"]

for n,p in enumerate(person_list):
    output = p
    for digits in zip(list_of_lists_1[n],list_of_lists_2[n]):
        output  = digits[0] digits[1]
    print(output)

CodePudding user response：

By extension of @Barmar's answer (https://stackoverflow.com/a/71243300/218663) here is how you might do it with a list comprehension:

list_of_lists_1 = [["1", "3", "5"], ["7", "9", "11"], ["13", "15", "17"]]
list_of_lists_2 = [["2", "4", "6"], ["8", "10", "12"], ["14", "16", "18"]]
person_list = ["person_a", "person_b", "person_c"]

result = (
    f"{name}{s1}{s2}"
    for suffixes_1, suffixes_2, name in zip(list_of_lists_1, list_of_lists_2, person_list)
    for s1, s2 in zip(suffixes_1, suffixes_2)
)

for outcome in result:
    print(outcome)

Giving you:

person_a12
person_a34
person_a56
person_b78
person_b910
person_b1112
person_c1314
person_c1516
person_c1718