decorator-blogpost-uppercase.py

def uppercase_decorator(func):
  def wrapper():
    # Get the output of the original function
    output = func()
    # Modify the original output and return it
    return output.upper()
  # return the wrapper used to modify the decorated function
  return wrapper
  
@uppercase_decorator
def say_hello():
  return 'hello'

>>> say_hello()
HELLO