对一个字典中的每个键的多个值求和? [英] Summing multiple values of each key in a dict?

问题描述

我有一个像这样的python字典.

I have a python dictionary, which looks like this.

{ 'item1' : [1,2,3,4,5,6],
  'item2' : [2,3,1],
   .
   .
   .
  'item n' : [4,2,4,3,2]
}

现在，我的要求是，我想添加此字典&的数值.显示为:-

Now my requirement is that i want to add the numeric values of this dict & to show it as :-

{    'item1' : [21],
     'item2' : [6],
      .
      .
      .
     'item n' : [15]
}

我只希望对每个键的多个值求和&显示.仅供参考，我正在使用附加函数.下面是我的代码.

I just want the multiple values of each key to be summed up & displayed. FYI, I am using an append function. Below is my code.

for row in range(2,sheet2.max_row):
    for column in "D": 
        cell_name = "{}{}".format(column, row)
    for column2 in "P":
        cell_name2 = "{}{}".format(column2,row)
        arrdata2dict.setdefault(sheet2[cell_name].value,[])
        arrdata2dict[sheet2[cell_name].value].append(sheet2[cell_name2].value)

推荐答案

您可以动态地创建带有总和的字典:

You could create the dictionary with the sums on-the-fly:

Result = dict([(key, sum(values)) for key, values in yourDict.items()])
# or...
Result = {key: sum(values) for key, values in yourDict.items()}

在这里，新字典的值将是数字，但是如果您真的需要它们成为列表，则可以将调用sum括在方括号中:[sum(values)].

Here, the values of the new dictionary will be numbers, but if you really need them to be lists, you could enclose the call to sum in square brackets: [sum(values)].

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