@property example

"""getters, setters and property decorators examples
   Used to get and set protected variables(starts with _)
   using property makes all code call getter and setter functions when rear and write do this class protected variable"""


class AddTesterToString:
   def __init__(self, input_string):
       self.input_string = input_string

   # def getter function - gets _protected variable
   def get_input_string(self):
       print('getter')
       return self._input

   # setter function - sets value to _protected variable
   def set_input_string(self, input_string):
       print('setter')
       self._input = input_string + ' tester'

   # makes input string property - any code that gets value of input_string will use getter function, all that writes data will write to setter
   input_string = property(get_input_string, set_input_string)


a = AddTesterToString('alala')
c = a.input_string
a.input_string = 'gala'
print(a.input_string)


# with property decorators - removes get_ and Set_ functions
class AssTesterToStringProperty:
   def __init__(self, input_string):
       self.input_string = input_string

   @property  # make setter
   def input_string_a(self):
       print('getter')
       return self._input_string

   @input_string_a.setter  # decorattor for seter - name of protected variable, named as setter function
   def input_string_b(self, value):
       print('setter')
       self._input_string = value + ' tester'


d = AddTesterToString('fala')
e = d.input_string
d.input_string = 'mala'
print(d.input_string)