How do i use multiple conditions within a while loop? (Python)

Question

import sys
import math
import random

def main():
    # your code goes here
    
    j = [1,1,2,3,5]
    GMDN(j)
    
    
def GMDN(x):

    n = 5
    x = [1,1,2,3,5]
    arithmetic = (x[0] + x[1] + x[2] + x[3] + x[4])/n
    geometric = (x[0] * x[1] * x[2] * x[3] * x[4])**(1./n)
    median = x[int((n)/2)]
    my_list = [arithmetic,geometric,median]
    my_list.sort()
    print(my_list)
    while(my_list[0] != my_list[1] and my_list[1] != my_list[2]):
        n1 = (my_list[0] + my_list[1] + my_list[2])/3
        n2 = (my_list[0] * my_list[1] * my_list[2])**(1./3)
        n3 = my_list[int((3)/2)]
        my_list = [n1,n2,n3]
        my_list.sort()
        print(my_list)
        

if __name__ == '__main__':
    main()

I'm trying to write a code that uses a while loop with more than one condition but whenever I run the code it doesn't process both conditions and only does one. Anyone know why this happens?

If the first condition of `and` is false, there is no need to evaluate the second condition and so it doesn't. Perhaps you want `or` instead. — chepner, Jan 10 '22 at 17:04
What specific test are you trying to make with those conditions? — ekhumoro, Jan 10 '22 at 17:53
Are you waiting for all three values to converge? That is, in fact, `my_list[0] != my_list[1] or my_list[1] != my_list[2]`, or using De Morgans's laws and comparison chaining, `not (my_list[0] == my_list[1] == my_list[2])`. — chepner, Jan 11 '22 at 16:41

Emirhan Kaplan · Answer 1 · 2022-01-10T17:06:32.583

while(my_list[0] != my_list[1] and my_list[1] != my_list[2]): this code will process both conditions.

what I think you are missing is that you are using static values. my_list[0] will always return the first item in the series. if you want to reach another element in your series whenever you go through the iteration you need to use dynamic values. if you are intentionally using static values as that might be the case based on your calculations in the iteration, then most likely your calculations are not working as you expect.

EDIT: based on the above comments, if you meant one or the other condition you need to use or instead of and.

How do i use multiple conditions within a while loop? (Python)

1 Answers1