<human>:  iterate an nest dict and return.
<bot>: Here is a Python function to iterate an nest dict and return a return value

import json

def iterate_nest_dict(d, key):
  """
  Iterate an nest dict and return
  """
  for k, v in list(d.items()):
    if isinstance(v, dict):
      yield from iterate_nest_dict(v, key + "." + k)
    else:
      yield (key + "." + k, v)

# Enter the dict
d = {"a": {"b": {"c": 1}}}

# Calling the function
for k, v in iterate_nest_dict(d, ""):
  print((k, v))

#Example Output
("", {"a": {"b": {"c": 1}}})

# ('.a.b.c', 1)

#Remember to inspect code for bugs.