Reassigning keys in dictionary of lists and then writing out to CSV file?

[Sahlusar]

I am currently attempting to work on converting a fairly sizeable JSON object and convert it into a CSV format. However, when I attempt to do so, using a conventional approach (that seems to work with other files). I am presented with a "ValueError: too many values to unpack"

I have tried to flatten the JSON object using this function:

# def flatten(d, parent_key=''):
#     items = []
#     for k, v in d.items():
#         try:
#             items.extend(flatten(v, '%s%s_' % (parent_key, k)).items())
#         except AttributeError:
#             items.append(('%s%s' % (parent_key, k), v))
#     return dict(items)


However this concatenates the keys. I am now attempting to remove the nested key and reassigning to the outer key. 

Here are some samples. I would remove Int32, Double and DateTime. I am wondering if there is a function that would then allow me to assign the new keys as column headers in a CSV and concatenate all of the values within the list (as corresponding fields). I hope that I was clear in my description. Thank you all for your help. 

"FC": {"Int32": ["0","0","0","0","0","0"]} and
                 
"PBA": {"Double": ["0","0","0","0","0","0","0","0"]}

and such examples:

"PBDD": {
						"DateTime": ["1/1/0001 12:00:00 AM",
						"1/1/0001 12:00:00 AM",
						"1/1/0001 12:00:00 AM",
						"1/1/0001 12:00:00 AM",
						"1/1/0001 12:00:00 AM",
						"1/1/0001 12:00:00 AM",
						"1/1/0001 12:00:00 AM",
						"1/1/0001 12:00:00 AM"]
					},