Why does it execute every if loop even I specified the very carefull?

if "yes" or "Yes" in delivery and adult_pizzas+children_pizza <20: print("Total costs: %d$" %(adult_pizzasnormal_price+children_pizzachildren_price+ delivery_costs)) if "no" or "No" in delivery and adult_pizzas+children_pizza <20: print("Total costs: %d$" %(adult_pizzasnormal_price+children_pizzachildren_price))

if "yes" or "Yes" in delivery and adult_pizzas+children_pizza >=20: print("Total costs: %d$" %(adult_pizzas*normal_price*0.8+children_pizzachildren_price+ delivery_costs)) if "no" or "No" in delivery and adult_pizzas+children_pizza <20: print("Total costs: %d$" %(adult_pizzasnormal_price*0.8+children_pizza*children_price))