Python中Json文件的写入与读取

1. 字典写入Json文件，代码如下：

import json

sparkConfDict = {
        'defaultMaxSplitBytes': defaultMaxSplitBytes,
        'openCostInBytes': openCostInBytes,
        'defaultParallelism': defaultParallelism
}
jsonStr = json.dumps(sparkConfDict)
# 写入到json文件中
with open('results/sparkConf.json', 'w') as json_file:
    json_file.write(jsonStr)

2. 从Json文件读取，并转化为字典：

import json

f = open('results/sparkConf.json', 'r')
content = f.read()
f.close()
#转化为字典
sparkConfDict = json.loads(content)
defaultMaxSplitBytes = (sparkConfDict["defaultMaxSplitBytes"])
openCostInBytes = (sparkConfDict["openCostInBytes"])
defaultParallelism = (sparkConfDict["defaultParallelism"])

注意Import json即可。