Python update and get data from nested dict

nested_dict_opration.py

from functools import reduce
def deep_get(dictionary, keys_list, default=None):
        keys = ".".join(keys_list)   
        return reduce(lambda d, key: d.get(key, default) if isinstance(d, dict) else default, keys.split("."),
                  dictionary)
       
def setInDict(dataDict, mapList, value):
        if mapList[:-1]:
                if deep_get(dataDict, mapList[:-1]):
                        deep_get(dataDict, mapList[:-1])[mapList[-1]] = value
                else:   
                        setInDict(dataDict, mapList[:-1], {mapList[-1]: value})
         else:
                dataDict[mapList[0]] = value
        return dataDict
   
dict_name = {"name": {"fname": "sharma"}}
       
abc = setInDict(dict_name, ["name", "fname"], "manmohan")
print abc