如何从字典的相同值中生成逗号分隔的字符串

Question

我有一份字典清单。它们对于少数几个键具有相同的值。我想用逗号分隔这些键的字符串，这些键是字典中常见的值。

输入：

l = [{'name':'abc', 'role_no':30,'class':'class-2'},{'name':'abc','role_no':30, 'class':'class-3'},{'name':'mnp','role_no':31,'class':'class-4'}]

输出：

l=[{'name':'abc','role_no':30, 'class':'class-2, class3'}, {'name':'mnp','role_no':31,'class':'class-4'}]

Answer 1

这是一段代码，它能给你想要的：

l = [{'name':'abc', 'role_no':30, 'class':'class-2'},{'name':'abc', 'role_no':30, 'class':'class-3'}]

o = [{}] #output since you want a list of a dictionary

for i in l: #For each dictionary
    for j in i: #for each key in the dictionary
        if j not in o[0]: #if the value of the key is not in o
            o[0][j] = i[j] #add a new value to the output dictionary
        elif o[0][j]==i[j]: #if the value is in o and matches the value already there
            pass
        else: #if the value is in o and doesn't match the value already there
            o[0][j]+= ", " + (i[j]) #otherwise add it to the string of the value that is there

print(o) #[{'name': 'abc', 'role_no': 30, 'class': 'class-2, class-3'}]