class Items:
   def __init__(self):


   def quantity(self):


   def price(self):

   def weight(self):


class Customer:
    def __init__(self):
        self.name = None
        self.address = None
        self.phone_number = None

    def name(self):
        self.name = input("Please enter full name: ")


    def address(self):
        self.address = input("Please enter full address: ")

    def phone_number(self):

class Supplier:
    def __init__(self):

    def name_s(self):

    def address_s(self):

    def phone_number_s(self):

