如何使用python创建字典列表 [英] how to create a list of dictionaries using python

问题描述

我有一个函数，该函数返回一个列表，在该列表中我序列化为json对象并将其写入JSON文件.

I have a function that returns a list where I serialized into a json object and write it to a JSON file.

结果是正确的，但是问题在于它返回了分隔列表中的每条记录.

the result is correct but the problem is that it returns each record in the separated list.

我想要的是返回一个包含多个词典项目的列表.

what I want is to return one list with multiple dictionary items.

[{"file Name": "test1.txt", "searched Word": "th", "number of occurence": 1}][{"file Name": "test2.txt", "searched Word": "th", "number of occurence": 1}]

预期结果

[
 {
   "file Name": "test1.txt",
   "searched Word": "th", 
   "number of occurence": 1
  }
  {
   "file Name": "test2.txt",
   "searched Word": "th",
   "number of occurence": 1
  }
 ]

我该如何实现?

    for counter, myLine in enumerate(textList):
                thematch=re.sub(searchedSTR,RepX,myLine)
                matches = re.findall(searchedSTR, myLine, re.MULTILINE | re.IGNORECASE)


                if len(matches) > 0:  

                    # add one record for the match (add one because line numbers start with 1)
                    d[matches[0]].append(counter + 1)
                self.textEdit_PDFpreview.insertHtml(str(thematch))
                '''
                loop over the selected file and extract 3 values:
                ==> name of file 
                ==> searched expression
                ==> number of occurence 
                '''
listMetaData=[]
                for match, positions in d.items():
                    listMetaData.append({"file Name":fileName,"searched Word":match,"number of occurence":len(positions)})
                jsondata = json.dumps(listMetaData)
                print(jsondata)

推荐答案

下面是一个示例代码，用于将多个词典列表转换为单个词典列表.

Here is a sample code to convert multiple lists of dictionaries into single list of dictionaries.

我假设您的json逗号分隔，即每个列表之间都有逗号.

I assume your json has comma separated i.e there is comma between each list.

[{"file Name": "test1.txt", "searched Word": "th", "number of occurence": 1}],[{"file Name": "test2.txt", "searched Word": "th", "number of occurence": 1}]

示例代码:

myDict = []
myJsonvar = [{"file Name": "test1.txt", "searched Word": "th", "number of occurence": 1}],[{"file Name": "test2.txt", "searched Word": "th", "number of occurence": 1}]

for idx,jstrings in enumerate(myJsonvar) :
    for inx, elem in enumerate(jstrings) :
        myDict.append(myJsonvar[idx][inx])

print(myDict)

输出:

[{'file Name': 'test1.txt', 'searched Word': 'th', 'number of occurence': 1}, {'file Name': 'test2.txt', 'searched Word': 'th', 'number of occurence': 1}]

此输出还将是逗号分隔的单列表字典.

This output will also be comma separated single list dictionaries.

其他方法: 如果您不想制作字典列表或不想在列表之间添加逗号.

Other approach : if you don't want to make list of dictionaries or append comma between lists .

您可以尝试以下代码:

import re

import yaml


myListOfDict = []
myJsonvar = '[{"file Name": "test1.txt", "searched Word": "th", "number of occurence": 1}][{"file Name": "test2.txt", "searched Word": "th", "number of occurence": 1}]'

mylist = myJsonvar.split("][")

for lst in mylist :
    updateVar = re.sub(r'[\[\]]', '',lst)
    myListOfDict.append(yaml.load(updateVar))

print(myListOfDict)

输出

[{'file Name': 'test1.txt', 'searched Word': 'th', 'number of occurence': 1}, {'file Name': 'test2.txt', 'searched Word': 'th', 'number of occurence': 1}] 

希望这对您有帮助

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