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| class ConstantixError(AttributeError):
def __str__(self):
return 'Constant can not be set again'
class IntervalixError(ValueError):
def __str__(self):
return 'Value is not between {} and {}, got {}'.format(*self.args)
class PositivixError(ValueError):
def __str__(self):
return 'Value can\'t be lower than 0'
class Basix:
__id = 0
def __init__(self):
self._id = Basix.__id
Basix.__id += 1
def __set__(self, obj, value):
self.__dict__[self.get_id(obj)] = value
def __get__(self, obj, type_obj):
# return self.__dict__.get(self.get_id(obj), None)
try:
return self.__dict__[self.get_id(obj)]
except KeyError:
raise AttributeError('Value is not set')
def get_id(self, obj):
return '{}_{}'.format(id(obj), self._id)
class Positivix(Basix):
def __set__(self, obj, value):
try:
value = int(value)
assert value >= 0
except ValueError:
raise ValueError('Value is not integer')
except AssertionError:
raise PositivixError
super().__set__(obj, value)
class Constantix(Basix):
def __set__(self, obj, value):
try:
self.__get__(obj, value)
except AttributeError:
super().__set__(obj, value)
else:
raise ConstantixError
class Intervalix(Basix):
def __init__(self, min_value, max_value):
self.__min = min_value
self.__max = max_value
super().__init__()
def __set__(self, instance, value):
try:
assert self.__min <= value <= self.__max
except TypeError:
raise
except AssertionError:
raise IntervalixError(self.__min, self.__max, value)
super().__set__(instance, value)
if __name__ == '__main__':
class BaseTest:
CONST = Constantix()
bas = Intervalix(1, 10)
haut = Intervalix(40, 50)
nombre = Positivix()
class A(BaseTest):
def __init__(self):
self.CONST = 'coucou A'
self.bas = 1
self.haut = 40
self.nombre = 0
class B(BaseTest):
def __init__(self):
self.CONST = 'coucou B'
self.bas = 5
self.haut = 44
self.nombre = 8
a = A()
b = B()
for obj in (b, a):
print(obj.__class__, obj.CONST, obj.bas, obj.haut, obj.nombre)
try:
a.CONST = 'boum'
except Exception as e:
print(e)
for v in ('a', 1.2, -1, 8):
try:
a.bas = v
except Exception as e:
print(v, e)
else:
print('a.bas =', a.bas)
print('bas')
for obj in (a, b):
print(obj.__class__, obj.bas)
a.nombre = 41
print('nombre', a.nombre, b.nombre) |
