Python 3 未正确读取"if's

Question

我似乎无法让我的代码正常工作。我相信有许多不同的方法可以让这段代码用更少的行工作，但这是我目前在理解它的同时编写代码的唯一方法。

当我使用诸如 500 之类的值表示最大成本和"b"表示desired_features我只返回斯卡伯勒时，当我应该返回时：巴塞罗那、加利福尼亚、科孚岛、斯卡伯勒和惠特比，因为它们都有海滩并且成本低于 500。

print("INPUT:")
max_cost         = input( "How many coins do you want to? " )
print("""nDesired holdiday features:
    b = beach
    c = culture
    h = hot
    m = mountains
""")

desired_features = input( "Enter string of first letters of desired features: " ) 
#barcelona
if (max_cost >="320" and desired_features == ("bch","b","c", "h", "bc", "bh", "cb", "ch", "hb", "hc" )): 
    destination_list = "Barcelona"
else:
    destination_list = []
print (destination_list)
#California
if (max_cost >="750" and desired_features == ("bhm" , "b", "h", "m", "bh", "bm", "hb", "hm", "mb", "mh" )):
    destination_list = "California"
else:
    destination_list = []
print (destination_list)
#Corfu
if (max_cost >="300" and desired_features == ("bh", "b", "h", "hb")):
    destination_list = "Corfu"
else:
    destination_list = []
print (destination_list)
#Paris
if (max_cost >="250" and desired_features == "c"): 
    destination_list = "Paris"
else:
    destination_list = []
print (destination_list)
#Rome
if (max_cost >="300" and desired_features == ("ch", "c", "h", "hc")): 
    destination_list = "Rome"
else:
    destination_list = []
print (destination_list)
#Scarborough
if (max_cost >="45" and desired_features == "b"): 
    destination_list = "Scarborough"
else:
    destination_list = []
print (destination_list)
#Switzerland
if (max_cost >="450" and desired_features == ("cm", "c", "m", "mc")): 
    destination_list = "Switzerland"
else:
    destination_list = []
print (destination_list)
#Whitby
if (max_cost >="60" and desired_features == ("bc", "c", "b", "bc")): 
    destination_list = "Whitby"
else:
    destination_list = []
print (destination_list)

#    holiday_data = [ ["Barcelona",   320,  ["beach", "culture", "hot"]],
#                 ["California",  750,  ["beach", "hot", "mountains"]],
#                 ["Corfu",       300,  ["beach", "hot"]],
#                 ["Paris",       250,  ["culture"]],
#                 ["Rome",        300,  ["culture", "hot"]],
#                 ["Scarborough",  45,  ["beach"]], 
#                 ["Switzerland", 450,  ["culture", "mountains"]],
#                 ["Whitby",       60,  ["beach", "culture"]]
#               ]    

Answer 1

我不认为你在海滩等测试中的意思是 ==。 也许"在"？

if (max_cost >="300" and desired_features in ("ch", "c", "h", "hc"))

请注意，列表是使用括号而不是括号定义的，并使用"in"运算符而不是 == 来确定字符串是否在列表中。

好吧，我不是一个讨厌元组的人，只是更习惯于列表......如果您喜欢，请使用元组（上图）。

Answer 2

原因是因为你正在使用这个

if (max_cost >="45" and desired_features == "b")

它返回"Scarborough"

，因为只有"Scarborough"具有"b"的单个所需特征

例如

 if (max_cost >="450" and desired_features in ("cm", "c", "m", "mc"))

已编辑以更改为元组:)