不可排序的类型: NoneType() < NoneType()
不可排序的类型: NoneType() < NoneType()
提问于 2019-04-14 14:08:21
每当我在cheapest_shipping函数中输入一个大于10的值时，它就会给出一个不可排序的类型错误。
我尝试过将单独的变量传递给函数来计算成本。我还尝试了不同的比较运算符。
cost = 0
pgs = 125
def gsp(weight):
if weight == 0:
cost = 20
return cost
elif weight <= 2:
cost = (1.5 * weight + 20)
return cost
elif weight > 2 and weight <= 6:
cost = (3 * weight + 20)
return cost
elif weight > 6 and weight <= 10:
cost = (4 * weight + 20)
return cost
elif weight > 10:
cost = (4.75 * weight + 20)
def dsp(weight):
if weight == 0:
cost = 0
return cost
elif weight <= 2:
cost = (4.5 * weight)
return cost
elif weight > 2 and weight <= 6:
cost = (9 * weight)
return cost
elif weight > 6 and weight <= 10:
cost = (12 * weight)
return cost
elif weight > 10:
cost = (14.25 * weight)
def cheapest_shipping(weight):
if gsp(weight) < dsp(weight) and gsp(weight) < pgs:
return "Ground shipping is the cheapest option at $" + str(gsp(weight))
elif dsp(weight) < gsp(weight) and dsp(weight) < pgs:
return "Drone shipping is the cheapest option at $" + str(dsp(weight))
print (cheapest_shipping(11))该函数使用我的地面运输价格函数和无人机运输价格函数，以及溢价地面运输的成本，并采用权重输入，并应返回最便宜的运输选项。它在输入超过10之前一直工作。
回答 1
Stack Overflow用户
回答已采纳
发布于 2019-04-14 14:17:56
最后一条elif语句中缺少return cost。这可能就是你想要的
cost = 0
pgs = 125
def gsp(weight):
if weight == 0:
cost = 20
return cost
elif weight <= 2:
cost = (1.5 * weight + 20)
return cost
elif weight > 2 and weight <= 6:
cost = (3 * weight + 20)
return cost
elif weight > 6 and weight <= 10:
cost = (4 * weight + 20)
return cost
elif weight > 10:
cost = (4.75 * weight + 20)
return cost
def dsp(weight):
if weight == 0:
cost = 0
return cost
elif weight <= 2:
cost = (4.5 * weight)
return cost
elif 2 < weight <= 6:
cost = (9 * weight)
return cost
elif 6 < weight <= 10:
cost = (12 * weight)
return cost
elif weight > 10:
cost = (14.25 * weight)
return cost
def cheapest_shipping(weight):
if gsp(weight) < dsp(weight) and gsp(weight) < pgs:
return "Ground shipping is the cheapest option at $" + str(gsp(weight))
elif dsp(weight) < gsp(weight) and dsp(weight) < pgs:
return "Drone shipping is the cheapest option at $" + str(dsp(weight))
print (cheapest_shipping(11))页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/55672434
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