burger.validators.NoneProperty Class Reference

Class to enforce None in member variable. More...

Public Member Functions
	__init__ (self, name)
	Initialize to default.
	__get__ (self, instance, owner=None)
	Return None.
	__set__ (self, instance, value)
	Throw if not None.

Protected Attributes
	_name = name
	The real name of the class instance.

Detailed Description

Class to enforce None in member variable.

Examples

"Inherit from (object) for Python 2.7"
>>> class foo(object):
    "Init to None"
    x = NoneProperty()
 
"Create the class"
f = foo()
 
"Print None"
print(f.x)
 
"Exception on non None data"
f.x = "not None"
Traceback (most recent call last):
    ...
ValueError: Not None value

Constructor & Destructor Documentation

__init__()

burger.validators.NoneProperty.__init__	(		self,
			name )

Initialize to default.

Parameters

name	Name of the instance storage index

Member Function Documentation

__get__()

burger.validators.NoneProperty.__get__	(		self,
			instance,
			owner = None )

Return None.

Parameters

instance	Reference to object containing data
owner	Not used

Returns

None, or verified data

__set__()

burger.validators.NoneProperty.__set__	(		self,
			instance,
			value )

Throw if not None.

Parameters

instance	Reference to object containing data
value	None or value the can be converted to bool