class MyClass():
    def __init__(self):
        self.ID = None
    
    def id_generator():
        id_ = 0
        while 1:
            id_ += 1
            yield id_
    
    self.ID = id_generator()
    
    def order(self):
        self.order = {'Type': 'CLIENT', 
                      'Id': next(self.ID)}
                      


                      
customer = MyClass()
print(customer.ID)
customer.order()