如何重构嵌套使用中的代码？

def calculate_price(quantity, price):
    if quantity > 100:
        discount = 0.1
    else:
        discount = 0

    total_price = quantity * price * (1 - discount)
    return total_price

total_price = map(lambda x: x * (1 - discount), quantity * price)

if x > 0 and x < 10:
    # do something

discount = quantity > 100 ? 0.1 : 0

class OrderState:
    def __init__(self, order):
        self.order = order

    def process(self):
        pass


class InitialState(OrderState):
    def process(self):
        # do something
        self.order.state = ProcessingState(self.order)


class ProcessingState(OrderState):
    def process(self):
        # do something
        self.order.state = CompletedState(self.order)


class CompletedState(OrderState):
    def process(self):
        # do something

class ShippingStrategy:
    def calculate_price(self, order):
        pass


class FreeShipping(ShippingStrategy):
    def calculate_price(self, order):
        # do something


class PriorityShipping(ShippingStrategy):
    def calculate_price(self, order):
        # do something