[SOLVED] While loop doesnt stop

Question

I wanna make a program which creates n of families and allows firstnames not to equal to lastnames or firstnames.
names = ["tri", "ahmad", "doni", "lulu"]
firstnames = ["tri", "ahmad"]
lastnames = "tri"
while firstnames[0] == lastnames or firstnames[0] in firstnames:
firstnames[0] = random.choice(names)
print(firstnames)
So it will brutally change firstnames[0] to random value from names but firstnames and lastnames
However it doesnt stop. How can i solve this problem?
https://code.sololearn.com/cfFslXcl5hY7/?ref=app
https://code.sololearn.com/c62mH5j5d62U/?ref=app

Answer 1

Solved
https://code.sololearn.com/cA24a21a23a1/?ref=app

Answer 2

What do you mean by
"firstnames not to equal to lastname or firstnames"
fn != fn - > False

Answer 3

firstnames[0] in firstnames[1:]

Answer 4

for your other code you can do this:
while firstnames[j] in lastnames or firstnames.count(firstnames[j])>1 :
or better
len(set(firstnames)) < len(firstnames)

Answer 5

firstnames[0] is always in firstnames
infinite while loop.

Answer 6

the first entry of a list is always in the list
firstnames[0] in firstnames
is always true.

Answer 7

Doesnt it will only repeat one time?

Answer 8

The firstname[0] will be neither lastname nor what is inside firstname

Answer 9

I meant it will be random value from names that isnt equal to firstnames or lastnames, my expected output is ["doni/lulu", "ahmad"]

Answer 10

Still no output

Answer 11

I know, but firstnames[0] will be changed as what i said then while loop stops. i think there is no problem with my script this far

Answer 12

I see, now what should i do

Answer 13

use if inside the while loop and use a flag to drive while loop.