Python v3 player already guessed the number

I'm a novice in Python. I'm having difficulties telling the player that the player already guessed the number. I've been searching for a few days and can't figure it out.

Thanks for your help in advance.

This is my code:

import random

number = random.randint (1, 100)
guess = int(input("\nCan you guess the number?\n\n"))

guessing = 1

def get_guess(already_guessed):
        guess = input()
        if guess in already_guessed:
            print("You already guessed that number.")
        else:
            return guess

while guess != number:
    if guess < number:
        print("Your guess is too low.")
    if guess > number:
        print("Your guess is too high.")
    if guess == number:
        break

    guess = get_guess(input("Try again.\n\n"))