<human>:  Python functions to use dictionary functions to replace in the Python function.
<bot>: = value

# Enter the dictionary
d = {"a": 1, "b": 2, "c": 3}

# Enter the key and value
key = "a"
value = 4

# Calling the function
d2 = copy.deepcopy(d)
d2 = replace_dict(d2, key, value)

# Printing the dictionary
print(d2)

#Example Output
# None

#Remember to inspect code for bugs.