get_by_nested_keys

## get a nested value from a dictionary with only the final key ######################
## a version for key/s AND indices [but no dType] at https://pastebin.com/G92TZnnK ###
### example of usage in Example 1 at https://pastebin.com/5AjaUne0 ###################

## [ specifying data type of value with dType is optional ]
# a generator for the values
def yield_by_nested_keys(obj:dict, *keys, dType=None):
    if not keys or not isinstance(obj,(dict,list,set,tuple)): return
    if not isinstance(obj, dict):
        for v in obj:
            for y in yield_by_nested_keys(v,*keys,dType=dType): yield y
        return
    if len(keys)==1 and keys[0] in obj:
        if dType is None or isinstance(obj[keys[0]], dType):
            yield_list = obj[keys[0]] if dType==list else [obj[keys[0]]]
            for y in yield_list: yield y
    for k, v in obj.items():
        next_keys = keys[1:] if k==keys[0] else keys
        for y in yield_by_nested_keys(v,*next_keys,dType=dType): yield y

# returns either a list [if returnAll is True] or a single value [or vDef]
'''NOTE: if dType is list and find_all is not set [i.e., not True], then
   only the 1st item will be returned [or vDef if list is empty]'''
def get_by_nested_keys(obj:dict,*keys,dType=None,find_all=False,vDef=None):
    v_generator = yield_by_nested_keys(obj, *keys, dType=dType)
    if find_all: return list(v_generator)
    for v in v_generator: return v
    return vDef