如何用字符串和数字对列表进行排序
嗨，我是Python的新手，想知道我如何按价格从最大到最小的价格进行排序
Item1 = input("What item do you want to buy? ") # asking what item is
Cost1 = float(input("How much does this item cost? ")) # asking cost of item
Item2 = input("What item do you want to buy? ")
Cost2 = float(input("How much does this item cost? "))
Item3 = input("What item do you want to buy? ")
Cost3 = float(input("How much does this item cost? "))
Item4 = input("What item do you want to buy? ")
Cost4 = float(input("How much does this item cost? "))
Item5 = input("What item do you want to buy? ")
Cost5 = float(input("How much does this item cost? "))
List = [(Item1, Cost1), (Item2, Cost2), (Item3, Cost3), (Item4, Cost4), (Item5, Cost5)] # making a list of other lists
#bubble sort function so it prints in the correct order
def bubble_sort(List):
# Outer loop for traverse the entire list
for i in range(0,len(List)-1):
for j in range(len(List)-1):
if(List[j]<List[j+1]):
temp = List[j]
List[j] = List[j+1]
List[j+1] = temp
return List
print("Your shopping list is: ",bubble_sort(List))
hi im new to python and was wondering how i can sort by the price going from biggest to smallest but im not sure how to do that without just switching the order of the items and cost in the list
Item1 = input("What item do you want to buy? ") # asking what item is
Cost1 = float(input("How much does this item cost? ")) # asking cost of item
Item2 = input("What item do you want to buy? ")
Cost2 = float(input("How much does this item cost? "))
Item3 = input("What item do you want to buy? ")
Cost3 = float(input("How much does this item cost? "))
Item4 = input("What item do you want to buy? ")
Cost4 = float(input("How much does this item cost? "))
Item5 = input("What item do you want to buy? ")
Cost5 = float(input("How much does this item cost? "))
List = [(Item1, Cost1), (Item2, Cost2), (Item3, Cost3), (Item4, Cost4), (Item5, Cost5)] # making a list of other lists
#bubble sort function so it prints in the correct order
def bubble_sort(List):
# Outer loop for traverse the entire list
for i in range(0,len(List)-1):
for j in range(len(List)-1):
if(List[j]<List[j+1]):
temp = List[j]
List[j] = List[j+1]
List[j+1] = temp
return List
print("Your shopping list is: ",bubble_sort(List))
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可以使用索引访问元组t =（项目，成本）的各个元素，以便t [0]将t和t [1]中的项目引用到t中的成本。因此，您可以通过列表[J] [1]＆lt; list [J+1] [1]替换条件列表[J]＆lt; list [J+1]，以比较其第二个组件；请参阅下面的代码。
The individual elements of a tuple t=(item, cost) can be accessed using indexing, so that t[0] refers to the item in t and t[1] to the cost in t. Thus, you can replace the condition List[j]<List[j+1] by List[j][1]<List[j+1][1], in order to compare their second components; see code below.
提供的示例最简单的解决方案，
一旦您拥有所有输入，只需按价格排序，这就是全部
reverse = true会排序下降，因为您想要从最大到最小。The easiest solution for provided example,
once you have all inputs, just sort by price and that's all
reverse=Truewill sort descending, since you want from biggest to smallest.