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首页 > 解决方案 > 如何制作一个程序来告诉我列表中的重复值并告诉你重复值在哪里？

python - 如何制作一个程序来告诉我列表中的重复值并告诉你重复值在哪里？

问题描述

我开始学习 Python，我必须让这段代码为家庭作业工作。

这是我所做的

#Presentation
print("This program find all the repeated values ​​in a list and they tell you in what position they are")
print("First you have to make a list for that tell me")
#Input
elements=int(input("How many items does this list have? "))#Only for int
print("Tell me the items on this list")
list=[]
repeated=[]
counter=0
while counter != elements:
    a=int(input("=>"))#It only accepts integers but you have to be able to add any element
    list.append(a)
    counter=counter+1
    
#From here we already insert a list with n elements and name each element
    
#Now we have to see if there are repeated values
n=0
k=0
while k != elements:
    for i in list:
        if i == list[k]:
            n=n+1
    repeated.append(k)
    print (list[k],"repeated",n,"times")
    script=list[k]
    print(list[k],"is on the position number",list.index(script))
    n=0       
    k=k+1

我进行了研究，我知道有更简单的方法可以通过创建字典来了解元素重复的次数，但我仍然无法使用它，因为我没有在我正在学习的课程中学习

我目前唯一的问题是 - 如何让它只出现一次它重复多少次？-如何知道所有重复而不只是第一个重复在哪个位置？

这是该程序当前打印的示例

This program find all the repeated values ​​in a list and they tell you in what position they are
First you have to make a list for that tell me

How many items does this list have? 7
Tell me the items on this list

=>3

=>5

=>4

=>5

=>5

=>2

=>3
3 repeated 2 times
3 is on the position number 0
5 repeated 3 times
5 is on the position number 1
4 repeated 1 times
4 is on the position number 2
5 repeated 3 times
5 is on the position number 1
5 repeated 3 times
5 is on the position number 1
2 repeated 1 times
2 is on the position number 5
3 repeated 2 times
3 is on the position number 0

虽然我现在学的是很基础的东西，如果你也能留下一个更优化更简单的方法来解决这个问题，即使是更高级的也很有帮助，我很好奇也因为我想学更多.

标签： pythonlistfunction

解决方案

这很可能不是最好的方法，但你说你只是想用字典完成它，所以你去吧。

#Presentation
print("This program find all the repeated values ​​in a list and they tell you in what position they are")
print("First you have to make a list for that tell me")
#Input
elements=int(input("How many items does this list have? "))
print("Tell me the items on this list")
dicts = {}
counter=0
while counter != elements:
    a=int(input("=>"))
    dicts[counter] = a
    counter=counter+1 
  
rev_dict = {} 
for key, value in dicts.items(): 
    rev_dict.setdefault(value, set()).add(key) 
  
  
result = filter(lambda x: len(x)>1, rev_dict.values())
for x in result:
    print("At Positions " + str(x) + " The Value is " + str(dicts[next(iter(x))]))

一个很好的资源https://www.geeksforgeeks.org/python-find-keys-with-duplicate-values-in-dictionary/

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