将Python字典的值写回文件 [英] Write values of Python dictionary back to file

问题描述

我将信息从两个XML文件中提取到2个字典中，因为我想比较这些文件并在其中一个更改信息。

这些是我的字典： p>

源字典：

  d_source = {'123'：'description_1' ，'456'：'description_2'} 
  

目标字典：

  d_target = {'123'：'\\\
'，'456'：'description_2'} 
  

这是我的替换代码：

  for d in d_source： 
 d_target中的j 
如果d_target [j] =='\\\
'：
 d_target [j] = d_source [i] 
 print（d_target）
  

d_target更新为

  d_target = {'123'：'description_1'，'456'：'description_2'} 
  

然而，我提取字典的原始文件保持不变。我在这里缺少什么？

解决方案

您的解决方案之一是：

假设您要将其打印为json，如果您已经在使用dict，这是有道理的。

  import json 
 output = json.dumps（d_target）
 
f = open（myfile，'w'）
 f.write（输出）
 f.close （）
  

这将打印您的dict将文件作为json文件。

如果你想要它作为一个xml，你可以使用elementtree模块。

然后你可以使用这样的东西：

  from elementtree import ElementTree as ETree 
 ET = ETree 
 ET.xml_declaration =true
 products = ET .Element（products）
 properties = ET.Element（properties）
 products.append（properties）
 products.attrib [xmlns] =http：// schema .example.com / product_data_1.0
 update = ET.Element（update）
 delete = ET.Element（delete）
 products.append删除）
 products.append（update）
  

这只是一个例子来看看它这样做会产生一些类似的东西：

 < products xmlns =http://schema.example.com/product_data_1 0.0\" > 
< properties /> 
< delete /> 
< update /> 
< / products> 
  

并再次将此xml打印到文件中：

$ $
f = open（xml，'w'）
f.write（output ）
f.close（）

I extracted information from two XML files into 2 dictionaries because I wanted to compare these files and change information in one of them.

These are my dictionaries:

source dictionary:

d_source={'123': 'description_1', '456': 'description_2'}

target dictionary:

d_target={'123': '\n', '456': 'description_2'}

This is my replacement code:

for i in d_source:
    for j in d_target:
        if d_target[j]=='\n':
            d_target[j]=d_source[i]
print (d_target)

d_target is updated to

d_target = {'123': 'description_1', '456': 'description_2'}

However, my original files from which I extracted the dictionaries remain unchanged. What am I missing here?

解决方案

One of the solutions for you would be:

Let's say you want to print it as a json, it makes sense if you are already using dicts.

import json 
output = json.dumps(d_target)

f = open("myfile", 'w')
f.write(output)
f.close()

This will print your dict to file myfile as a json.

And if you want it as a xml you can use elementtree module.

Then you could use something like this:

from elementtree import ElementTree as ETree
ET = ETree
ET.xml_declaration = "true"
products = ET.Element("products")
properties = ET.Element("properties")
products.append(properties)
products.attrib["xmlns"] = "http://schema.example.com/product_data_1.0"
update = ET.Element("update")
delete = ET.Element("delete")
products.append(delete)
products.append(update)

This is just an example to see how it is done and this would create something like:

 <products xmlns="http://schema.example.com/product_data_1.0">
      <properties />
      <delete />
      <update />
 </products>

And to print this xml to file again:

output = ET.tostring(products, "utf-8")
f = open("xml", 'w')
f.write(output)
f.close()

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