Python - How do you make a random() variable in a loop?

# Combat System -------

def battle_menu():
    print("BATTLE MENU:")
    print("\n(1) ATTACK")
    print("(2) SPECIAL ATTACK")

def recall_last(func):
    def _inner(*args, **kwargs):
        if args:
            func.last_dealt = func(*args,**kwargs)
        else:
            func.last_dealt = getattr(func,'last_dealt',0)
        return func.last_dealt
    return _inner

@recall_last
def rand_damage(*values):
    return random.randrange(*values)

jack_health = 300
jack_damage = random.randrange(1, 10)
jack_defense = random.randrange(1, 5)

boss_health = 700
boss_damage = random.randrange(10, 15)
boss_defense = random.randrange(15, 20)
def boss_specialattack(my_defense):
    my_defense = my_defense - 10
boss_killed = False

# ---------------------

#'my_damage' values
        deskemon_selection_input = input("> ")
    if deskemon_selection_input == "1":
        deskemon = "TIMOSHA"
        my_health = 500
        my_damage = (25, 30)
        my_defense = (10, 15)
        my_specialattack = 0
        print("You have selected TIMOSHA as your Deskemon")
        deskemon_selection_loop = False
    elif deskemon_selection_input == "2":
        deskemon = "PICKAPOO"
        my_health = 750
        my_min = 20
        my_max = 25
        my_damage = lambda: random.randrange(my_min, my_max)
        my_defense = random.randrange(20, 25)
        my_specialattack = 0
        print("You have selected PICKAPOO as your Deskemon")
        deskemon_selection_loop = False
    elif deskemon_selection_input == "3":
        deskemon = "LILWILLY"
        my_health = 1000
        my_damage = random.randrange(40, 45)
        my_defense = random.randrange(10, 15)
        def my_specialattack():
            boss_killed = True
        print("You have selected LILWILLY as your Deskemon")
        deskemon_selection_loop = False
    elif deskemon_selection_input == "4":
        deskemon = "BIGGBOI"
        my_health = 2000
        my_damage = random.randrange(10, 15)
        my_defense = random.randrange(50, 60)
        my_specialattack = 0
        print("You have selected BIGGBOI as your Deskemon")
        deskemon_selection_loop = False
    elif deskemon_selection_input == "":
        deskemon_selection_loop = True
    else:
        deskemon_selection_loop = True

#combat system
            print("LET'S GO BATTLE!")
        jack_battle_loop = True
        while jack_battle_loop:
            battle_menu()
            choise = input("> ")
            if choise == "1":
                #(jack_health + jack_defense) - my_damage = jack_health
                jack_health = (jack_health + jack_defense) - rand_damage(*my_damage)
                print(deskemon + " HAS INFLICTED " + str(rand_damage()) + " TO CHIPHEAD")
                if jack_health <= 0:
                    jack_battle_loop = False
                    break
                print("CHIPHEAD HAS " + str(jack_health) + " HITPOINTS LEFT!")
                time.sleep(1)
                print("...")
                time.sleep(1)
                print("...")
                time.sleep(1)
                print("...")
                time.sleep(1)
                #(my_health + my_defense) - jack_damage = my_health
                my_health = (my_health + my_defense) - jack_damage
                print("CHIPHEAD HAVE INFLICTED " + str(jack_damage) + " TO " + deskemon)
                if my_health <= 0:
                    jack_battle_loop = False
                    break
                print(deskemon + " HAS " + str(jack_health) + " HITPOINTS LEFT!")
                jack_battle_loop = True
            elif choise == "":
                jack_battle_loop = True
            else:
                jack_battle_loop = True