我如何在python中将json转换为csv

Question

How can I convert the following json format logs to csv file in python :
Json Input ( log.json ):

{"time":"14472","abc":"0","Def":[{"name":"C","value":77},{"name":"N","value":88}]}  
{"time":"1447","abc":"1","Def":[{"name":"C","value":99,{"name":"N","value":0.12}]}  

Csv Output:

time   abc    name   value  
14472   0      C      77  
14472   0      N      88  
1447    1      C     99    
1447    1      N      0.12  

Answer 1

Have a look at https://docs.python.org/2/library/json.html

I haven't used it personally but I skimmed the docs once and it seems that it creates a dictionary for each json object and a list for each array.

Once you have that then you can get the keys for the column labels and then you can it shouldn't be a big deal to actually write the file.

Answer 2

This should work assuming the 'log.json' input file contains valid json objects:

import csv
import json

with open('log.json', 'rb') as infile, open('output.csv', 'wb') as outfile:
    fieldnames = ['time', 'abc', 'name', 'value']
    writer = csv.DictWriter(outfile, fieldnames, delimiter='\t')
    writer.writeheader()
    for line in infile:
        row = json.loads(line)
        for a_def in row['Def']:
            writer.writerow({'time': row['time'],
                             'abc': row['abc'],
                             'name': a_def['name'],
                             'value': a_def['value']})