My function for finding LCM does not work. Is there a problem with the while loop?

x = int(input("Enter the first number"))
y = int(input("Enter the second number"))
def calculate_LCM(x,y):
    if (x>y):
        max=x
    else:
        max=y
    while((max%x==0) and (max%y==0)):
        print(max)
        max=max+1
          
          
print(calculate_LCM(x,y))

Solution

The smallest change to make your code work is to put a not on the while condition - you want the loop to repeat if both remainders are not 0.

while not ((max%x==0) and (max%y==0)):

Btw, your function doesn't return a value, so it implicitly returns None which is what print() receives. Add it after the while-block:

while not (max % x == 0 and max % y == 0):  # remove extra parens and add spaces, PEP8
    max += 1  # same as max = max + 1
return max

Side note: since 0 is boolean-Falsey and non-zero integers and floats are boolean Truthy, that while check can be reduced to:

while max % x or max % y:

so if either value (remainders) is non-zero, the loop repeats.

Tip: max() is a Python built-in so don't use that as a variable name.