Get all keys or values of a nested dictionary or list in Python

nested_iterator.py

def iterate_all(iterable, returned="key"):
    
    """Returns an iterator that returns all keys or values
       of a (nested) iterable.
       
       Arguments:
           - iterable: <list> or <dictionary>
           - returned: <string> "key" or "value"
           
       Returns:
           - <iterator>
    """
  
    if isinstance(iterable, dict):
        for key, value in iterable.items():
            if returned == "key":
                yield key
            elif returned == "value":
                if not (isinstance(value, dict) or isinstance(value, list)):
                    yield value
            else:
                raise ValueError("'returned' keyword only accepts 'key' or 'value'.")
            for ret in iterate_all(value, returned=returned):
                yield ret
    elif isinstance(iterable, list):
        for el in iterable:
            for ret in iterate_all(el, returned=returned):
                yield ret

I used @mh-malekpour code and added support for objects that are nested inside of arrays.

def generic_items(dict_or_list):
	if type(dict_or_list) is dict:
		return dict_or_list.items()
	if type(dict_or_list) is list:
		return enumerate(dict_or_list)
def get_keys(dictionary):
	result = []
	for key, value in generic_items(dictionary):
		if type(value) is dict or type(value) is list:
			new_keys = get_keys(value)
			result.append(key)
			for innerkey in new_keys:
				result.append(f'{key}/{innerkey}')
		else:
			result.append(key)
	return result