Example_2_using_classes

Using_classes_to_validate_attributes_part_2.py

class StrAttrValidation(object):
    def __init__(self):
        self._dict = dict()

    def __set__(self, instance, value):
        if not isinstance(value, str):
            raise AttributeError('Only Str type valid')
        self._dict[instance] = value.title()

    def __get__(self, instance, value):
        return self._dict[instance]


class Employees(object):

    name = StrAttrValidation()
    location = StrAttrValidation()

    def __init__(self, name, location):
        self.name = name
        self.location = location


emp1 = Employees('stephen', 689698)


print(emp1.name)
print(emp1.location)

# Terminal Output

# File "...." line 63, in __set__
#     raise AttributeError('Only Str type valid')
# AttributeError: Only Str type valid