How can I put several if statements into a Tkinter Button

I have tried to put my if statements into a messagebox function and have the button print out a message with a number and the corresponding player. I have tried everything I can think of and it still doesn't work, at the moment it prints out a random number but of course I want it to print the player's name as well, any help will be appreciated :)

    print(number)
    if number == 18:
        print(no_18)
    elif number == 17:
        print(no_17)
    elif number == 16:
        print(no_16)
    elif number == 15:
       elif number == 5:
        print(no_5)
    elif number == 3:
        print(no_3)
    elif number == 2:
        print(no_2)
    elif number == 1:
        print(no_1)
    else:
        print("Player not found")
   

    def generate_number():
        messagebox.showinfo("You got this player!", random.randint(1, 20))
    
    
    root = tk.Tk()
    
    canvas = tk.Canvas(root, height=600, width=600, bg="#f40000")
    canvas.pack()
    
    label1 = tk.Label(root, text="Click for a random player", bg="#f40000", fg="#323648")
    label1.config(font=("", 24))
    label1.place(relx=0.22, rely=0.1)
    
    button1 = tk.Button(root, height=12, width=30, text="Random \n Man United player", 
    command=generate_number, bg="#ef7a85", activebackground="#dd6d11")
    button1.place(relx=0.34, rely=0.4)
    
    root.mainloop()