Creating a multi-header table from JSON

问题

I'm new to pandas. I'm trying to create the following table:

        |          C         |          Perl      |
        |   line   |   func  |    line   |   func |
version |  covered |  total  |  covered  |  total |

There is the following structure of JSON that I have created:

{
   "version1":{
      "perl":{
         "line_covered":207,
         "line_total":312,
         "func_covered":15,
         "func_total":18
      },
      "C":{
         "line_covered":321,
         "line_total":512,
         "func_covered":10,
         "func_total":10
      }
   }
}

I want to iterate over this JSON and create the table. My first problem is that I can't seem to understand how should I create the header of the table. From previous topics, I found that I should use MultiIndex but for some reason, any combination I tried, does not create the wanted header. Is it possible to show me how to create this table?

回答1:

My approach

import numpy as np
from collections import defaultdict
d = defaultdict(list)

---

for k,v in my_dict.items():
    d['index'].append(k)
    for k1,v1 in v.items():
        for k2,v2 in v1.items():
            d['columns'].append((k1,k2))
            d['data'].append(v2)
d = dict(d)
d['data'] = np.array(d['data']).reshape(1, len(d['data']))
d['columns'] = pd.MultiIndex.from_tuples(columns)

---

Build DataFrame

pd.DataFrame(**d)

Output

                 perl                                               C                       
         line_covered line_total func_covered func_total func_covered           func_total   
version1          207        312           15         18           10  version1         10   

use defaultdict but could just start three lists before starting the loop

EDIT

for expected output use

import numpy as np
from collections import defaultdict
d = defaultdict(list)
for k,v in my_dict.items():
    d['index'].append(k)
    for k1,v1 in v.items():
        for k2,v2 in v1.items():
            split = k2.split('_')
            d['columns'].append((k1, split[0]))
            d['data'].append(split[1])
d = dict(d)
d['data'] = np.array(d['data']).reshape(1,len(d['data']))
d['columns'] = pd.MultiIndex.from_tuples(d['columns']).copy()
pd.DataFrame(**d)

---

Output

             perl                               C       
             line   line     func   func     func   func
version1  covered  total  covered  total  covered  total

Details

print(d)
#{'index': ['version1'], 'columns': MultiIndex([('perl', 'line_covered'),
#            ('perl',   'line_total'),
#            ('perl', 'func_covered'),
#            ('perl',   'func_total'),
#            (   'C', 'func_covered'),
#            (   'C',   'func_total')],
#           ), 'data': array([[207, 312,  15,  18,  10,  10]])}

you can see what** do

来源：https://stackoverflow.com/questions/60729245/creating-a-multi-header-table-from-json