Answer 1

Decorators are tools mainly used to modify the behavior of a function in python. Decorators do so by wrapping a function in another function.

The outer function is called the decorator, which takes a function as an argument and returns a modified version.

For Example:

def make_pretty(func):
# define the inner function
def inner():
# add some additional behavior to decorated function
print("I got decorated")
# call original function
func()
# return the inner function
return inner

# define ordinary function
def ordinary():
print("I am ordinary")

# decorate the ordinary function
decorated_func = make_pretty(ordinary)

# call the decorated function
decorated_func()

==> And the same above function can be written as:
def make_pretty(func):
def inner():
print("I got decorated")
func()
return inner

@make_pretty
def ordinary():
print("I am ordinary")

ordinary()

Answer 2

It is a complicated topic unless you are very clear of functions and classes. I too felt that it has not much explanation and good examples.