PythonJson文件的写入和读取

1. 字典写入Json文件，代码如下：

1.  
   import json
2.  
    
3.  
   sparkConfDict = {
4.  
   'defaultMaxSplitBytes': defaultMaxSplitBytes,
5.  
   'openCostInBytes': openCostInBytes,
6.  
   'defaultParallelism': defaultParallelism
7.  
   }
8.  
   jsonStr = json.dumps(sparkConfDict)
9.  
   # 写入到json文件中
10.  
    with open('results/sparkConf.json', 'w') as json_file:
11.  
    json_file.write(jsonStr)

2. 从Json文件读取，并转化为字典：

1.  
   import json
2.  
    
3.  
   f = open('results/sparkConf.json', 'r')
4.  
   content = f.read()
5.  
   f.close()
6.  
   #转化为字典
7.  
   sparkConfDict = json.loads(content)
8.  
   defaultMaxSplitBytes = (sparkConfDict["defaultMaxSplitBytes"])
9.  
   openCostInBytes = (sparkConfDict["openCostInBytes"])
10.  
    defaultParallelism = (sparkConfDict["defaultParallelism"])

注意Import json即可。