@decorator examples

def decorator(func):
   """This is a decorator function. It takes some function as a parameter, 'wraps it' in code
   and RETURNs wrapped function
   This is a way to add functionality without changing base code"""

   def wrap(text='this is base function'):
       print('this is pre-function')
       func(text)
       print('this is post func')

   return wrap  # NB! must return wrapper function. Must return function!!!


def base_function(text='this is base function'):
   print(text)


@decorator
def decorated_func(text='this is base function'):
   print(text)


# writing same line from before without decorator
new_decorated_function = decorator(base_function)

base_function()
print('----')
decorated_func()
print('----')
decorated_func(text='aaaa')
print('----')
# decorated function call without decorator
new_decorated_function()
print('----')
new_decorated_function(text='bbb')