Imitating “do until”:
import random
n = 20
to_be_guessed = random.randint(1,n)
while True:
guess = int(input("Your guess: "))
if guess > to_be_guessed:
print("Number is too large")
elif guess < to_be_guessed:
print("Number is too small")
if guess == to_be_guessed:
break
print("You got it!")