Question

如何在字典的同一个键中添加不同的值？添加了这些不同的值在一个循环中。

以下是字典data_dict

中我想要的条目

data_dict = {} And during each iterations, output should looks like: Iteration1 -> {'HUBER': {'100': 5.42}} Iteration2 -> {'HUBER': {'100': 5.42, '10': 8.34}} Iteration3 -> {'HUBER': {'100': 5.42, '10': 8.34, '20': 7.75}} etc

但是，在迭代结束时，data_dict仅留下最后一个条目：

{'HUBER': {'80': 5.50}}

以下是代码：

import glob

path = "./meanFilesRun2/*.txt"
all_files = glob.glob(path)
data_dict = {}  

def func_(all_lines, method, points, data_dict):

   if method == "HUBER":
       mean_error = float(all_lines[-1]) # end of the file contains total_error
       data_dict["HUBER"] = {points: mean_error}
       return data_dict

   elif method == "L1":
       mean_error = float(all_lines[-1])
       data_dict["L1"] = {points: mean_error}
       return data_dict

for file_ in all_files:
   lineMthds = file_.split("_")[1] # reading line methods like "HUBER/L1/L2..."
   algoNum = file_.split("_")[-2] # reading diff. algos number used like "1/2.."
   points = file_.split("_")[2] # diff. points used like "10/20/30..."

   if algoNum == "1":
      FI = open(file_, "r")
      all_lines = FI.readlines()        

      data_dict = func_(all_lines, lineMthds, points, data_dict)           
      print data_dict
      FI.close()

Answer 1

您可以在此处使用dict.setdefault。目前，您的代码存在的问题是，在每次致电func_时，您都会将data_dict["HUBER"]重新分配给新的字典。

变化：

data_dict["HUBER"] = {points: mean_error}

为：

data_dict.setdefault("HUBER", {})[points] = mean_error

Answer 2

您可以使用集合模块中的defaultdict：

import collections

d = collections.defaultdict(dict)
d['HUBER']['100'] = 5.42
d['HUBER']['10'] = 3.45

将值附加到字典的相同键中

2 个答案: