Human: What is a good Python function to iterate an nest dict and return a return value. Assistant: 
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.