human
delete from a dictionary if exists.
assistant
Here is a Python program to delete from a dictionary if there is one

import re

def del_if_exist(dictionary, key):
    """
    Delete from a dictionary if exists

    :param dictionary:
    :param key:
    """
    if key in dictionary:
        del dictionary[key]

# Enter the dictionary
dictionary = {"carnation": "carnation", "cat": "cat", "bicycle": "bicycle"}

# Enter the key
key = "carnation"

# Calling the function
print((del_if_exist(dictionary, key)))

#Example Output
# None

#Remember to inspect code for bugs.