human
What is a good Python function to return none if input to my is empty.
assistant
Here is a Python function to return none if input to my is empty

import re

def is_empty(input):
    """
    Returns None if input is empty.
    """
    if input:
        return input
    else:
        return None

# Enter the string
string = "hello"

# Calling the function
print((is_empty(string)))

#Example Output
# hello

#Remember to inspect code for bugs.