[TBD]Useful decorators in python

Property

Property decorator example

root@ubuntu-232:~/deepak/test# cat test.py

class Celsius:

def __init__(self, temperature = 0):

self.temperature = temperature

def to_fahrenheit(self):

return (self.temperature * 1.8) + 32

def get_temperature(self):

print("Getting value")

return self._temperature

def set_temperature(self, value):

if value < -273:

raise ValueError("Temperature below -273 is not possible")

print("Setting value")

self._temperature = value

temperature = property(get_temperature,set_temperature)

temp=Celsius(20)

print(temp.temperature)

root@ubuntu-232:~/deepak/test# python3 test.py

Setting value

Getting value

20

Setter and getter API

Setter and getter

root@ubuntu-232:~/deepak/test# cat test2.py

class P:

def __init__(self,x):

self.x = x

@property

def x(self):

print("Inside property")

return self.__x

@x.setter

def x(self, x):

print("Inside setter")

if x < 0:

self.__x = 0

elif x > 1000:

self.__x = 1000

else:

self.__x = x

p=P(10)

p.x=20

print(p.x)

root@ubuntu-232:~/deepak/test# python3 test2.py

Inside setter

Inside setter

Inside property

20

Reference

https://www.programiz.com/python-programming/property

https://www.python-course.eu/python3_properties.php