打印出 python 字典中的所有重复项

Question

这是我的代码

with open('book1.csv', 'r') as f:
for key, value in c.items():
    if value == max_value:
        print(key)
        if key in dict_from_csv.keys():
            print(dict_from_csv[key])

它只打印出 2 个键，但我需要所有重复的键。

这是我的 CSV，它包含项目名称和成本。

我的完整代码是

c = rank(results)

max_value = max(values)

newlist1_value = values
newlist1_value.remove(max(values))

second_max_value = max(newlist1_value)

newlist2_value = newlist1_value
newlist2_value.remove(max(newlist1_value))

third_max_value = max(newlist2_value)

keys = []
mydict = {}

 with open('book1.csv', mode='r') as inp:
    reader = csv.reader(inp)
    dict_from_csv = {rows[2]: rows[3] for rows in reader}
    for key, value in c.items():
    if value == max_value:
        print(key)
        if key in dict_from_csv.keys():
            print(dict_from_csv[key])

我的目标是打印出所有重复的项目名称以及所有费用。

Answer 1

当您从 csv 创建字典时，重复的键会被覆盖。改用列表，然后跟踪字典中已经看到的键。如果给定键的值超过 2 个，则打印它们。

with open('book1.csv', 'r') as f:
    reader = csv.reader(f)
    list_from_csv = [[row[2], row[3]] for row in reader]
    max_value = max([x[1] for x in list_from_csv])
    dic = {}
    res = []

    for li in list_from_csv:
    #iterate over project name and and cost
        key, value = li
        # key is name of project, value is cost
        if value == max_value:
            print('max value', *li)
        if key in dic:
       #check if the project name is already in dic where you store values 
       #for same project name append value to already seen values
            dic[key].append(value)
        if key not in dic:
       # if key is not in dic create new with list of value, so you can append to it later 
            dic[key] = [value]
    # print(dic)

    for key, value in dic.items():
    # finally iterate over stored projects with list of values
    # if there are more than one value , it means it has duplicates so 
    # print them
        if len(value) > 1:
            print(key, *value)

打印出 python 字典中的所有重复项

Printing out all duplicates key in python dict

python

csv

dictionary

duplicates