python►b-OOP

Python-b05-Property Decorators

This article shows the examples of in python

email does not change when first changes

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class Employee:
    raise_amount = 2.04

    def __init__(self, first, last):
        self.first = first
        self.last = last
        self.email = first + '.' + last + '@company.com'

    def fullname(self):
        return '{} {}'.format(self.first, self.last)


emp_1 = Employee('Bob', 'Gobdo')

emp_1.first = 'Jim'

print(emp_1.first)          # Jim
print(emp_1.email)          # Bob.Gobdo@company.com
print(emp_1.fullname())     # Jim Gobdo

email move into method

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class Employee:
    raise_amount = 2.04

    def __init__(self, first, last):
        self.first = first
        self.last = last

    def email(self):
        return '{}.{}@company.com'.format(self.first, self.last)

    def fullname(self):
        return '{} {}'.format(self.first, self.last)


emp_1 = Employee('Bob', 'Gobdo')

emp_1.first = 'Jim'

print(emp_1.first)          # Jim
print(emp_1.email())        # Jim.Gobdo@company.com
print(emp_1.fullname())     # Jim Gobdo

add @property on method

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class Employee:
    raise_amount = 2.04

    def __init__(self, first, last):
        self.first = first
        self.last = last

    @property
    def email(self):
        return '{}.{}@company.com'.format(self.first, self.last)

    @property
    def fullname(self):
        return '{} {}'.format(self.first, self.last)


emp_1 = Employee('Bob', 'Gobdo')

emp_1.first = 'Jim'

print(emp_1.first)        # Jim
print(emp_1.email)        # Jim.Gobdo@company.com
print(emp_1.fullname)     # Jim Gobdo

setter

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class Employee:
    raise_amount = 2.04

    def __init__(self, first, last):
        self.first = first
        self.last = last

    @property
    def email(self):
        return '{}.{}@company.com'.format(self.first, self.last)

    @property
    def fullname(self):
        return '{} {}'.format(self.first, self.last)

    @fullname.setter
    def fullname(self, name):
        first, last = name.split(' ')
        self.first = first
        self.last = last

emp_1 = Employee('Bob', 'Gobdo')

emp_1.fullname = 'John Smith'

print(emp_1.first)        # John
print(emp_1.email)        # John.Smith@company.com
print(emp_1.fullname)     # John Smith

deleter

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class Employee:
    raise_amount = 2.04

    def __init__(self, first, last):
        self.first = first
        self.last = last

    @property
    def email(self):
        return '{}.{}@company.com'.format(self.first, self.last)

    @property
    def fullname(self):
        return '{} {}'.format(self.first, self.last)

    @fullname.setter
    def fullname(self, name):
        first, last = name.split(' ')
        self.first = first
        self.last = last

    @fullname.deleter
    def fullname(self):
        print('Delete name')
        self.first = None
        self.last = None

emp_1 = Employee('Bob', 'Gobdo')

del emp_1.fullname

print(emp_1.first)        # None
print(emp_1.email)        # None.None@company.com
print(emp_1.fullname)     # None None