[[Python]]
https://realpython.com/primer-on-python-decorators/
```python
from datetime import datetime
def not_during_the_night(func):
def wrapper():
if 7 <= datetime.now().hour < 22:
func()
else:
pass # Hush, the neighbors are asleep
return wrapper
def say_whee():
print("Whee!")
say_whee = not_during_the_night(say_whee)
```
is equivalent to
```python
def my_decorator(func):
def wrapper():
print("Something is happening before the function is called.")
func()
print("Something is happening after the function is called.")
return wrapper
@my_decorator
def say_whee():
print("Whee!")
```
Boilerplate template:
```python
import functools
def decorator(func):
@functools.wraps(func)
def wrapper_decorator(*args, **kwargs):
# Do something before
value = func(*args, **kwargs)
# Do something after
return value
return wrapper_decorator
```
Practical use cases - adding a timer or debug wrapper to a function
Built in decorators:
- `@classmethod` [[@classmethod]]
- `@staticmethod`