Explain how this oneliner list of lists merger works?

Question

[j for i in listOflists for j in i]

this code returns a merged list but I can't trace how it works, can anyone explain

See also: https://stackoverflow.com/questions/952914/how-to-make-a-flat-list-out-of-list-of-lists — FObersteiner, Nov 24 '19 at 19:25
Possible duplicate of [How to make a flat list out of list of lists?](https://stackoverflow.com/questions/952914/how-to-make-a-flat-list-out-of-list-of-lists) — Arkistarvh Kltzuonstev, Nov 24 '19 at 21:10

score 4 · Accepted Answer · answered Nov 24 '19 at 12:25

4

This is a nested for loop. The equivalent is

results = []
for i in listOflists:
    for j in i:
        results.append(j)

answered Nov 24 '19 at 12:25

Guy

1 Answers1