An attempt

expandJson.py

def expandJson(df, colName):
    jsonString = df.iloc[0][colName]
    decoded = json.loads(jsonString)
    attrs = decoded.keys()
    fld = df[colName]
    for attr in attrs: df[attr] = json.loads(fld)[attr]

traceback

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-19-bbe1cebc251e> in <module>
      8     for attr in attrs: df[attr] = json.loads(fld)
      9 
---> 10 expandJson(df_raw,"totals")

<ipython-input-19-bbe1cebc251e> in expandJson(df, colName)
      6     attrs = decoded.keys()
      7     fld = df[colName]
----> 8     for attr in attrs: df[attr] = json.loads(fld)
      9 
     10 expandJson(df_raw,"totals")

~/anaconda2/envs/fastai/lib/python3.6/json/__init__.py in loads(s, encoding, cls, object_hook, parse_float, parse_int, parse_constant, object_pairs_hook, **kw)
    346         if not isinstance(s, (bytes, bytearray)):
    347             raise TypeError('the JSON object must be str, bytes or bytearray, '
--> 348                             'not {!r}'.format(s.__class__.__name__))
    349         s = s.decode(detect_encoding(s), 'surrogatepass')
    350 

TypeError: the JSON object must be str, bytes or bytearray, not 'Series'