def __delattr__(self, strAttrName):
"""
Special magic method hooking the deletion of an attribute on the class
instance level. Does not allow deletion of the attributes with the names
starting with a single underscore, excepting those starting with more
than one undescore.
Signature:
str -> None
Args:
strAttrName: str, name of an attribute to delete
Raises:
libexceptions.PrivateAttributeAccess: denied access to a protected
attribute
libexceptions.CustomAttributeError: denied delition of an existing
attribute
libexceptions.NotExistingAttribute: the attribute does not exist
Version 1.0.0.0
"""
objClass = object.__getattribute__(self, '__class__')
bCond1 = strAttrName.startswith('_')
bCond2 = not strAttrName.startswith('__')
if bCond1 and bCond2:
raise PrivateAttributeAccess(strAttrName, objClass, iSkipFrames = 1)
if hasattr(self, strAttrName):
raise CustomAttributeError(strAttrName, objClass, iSkipFrames = 1)
else:
raise NotExistingAttribute(strAttrName, objClass, iSkipFrames = 1)
def __setattr__(self, strAttrName, gValue):
"""
Special magic method hooking the modification of an attribute access on
the class instance level. Does not allow modification of the attributes
with the names starting with a single underscore, excepting those
starting with more than one undescore.
Signature:
str, type A -> None
Args:
strAttrName: str, name of an attribute to modify
gValue: type A, the value to assign
Raises:
libexceptions.PrivateAttributeAccess: denied access to a protected
attribute
libexceptions.CustomAttributeError: denied modification of an
existing attribute due to its own desriptor limitation, or
deletion of an instance, class or static method
Version 1.0.0.0
"""
objClass = object.__getattribute__(self, '__class__')
bLocked = object.__getattribute__(self, '__dict__').get('_bLocked',
False)
bCond1 = strAttrName.startswith('_')
bCond2 = not strAttrName.startswith('__')
if bCond1 and bCond2 and bLocked:
raise PrivateAttributeAccess(strAttrName, objClass, iSkipFrames = 1)
if strAttrName in self.__dict__.keys():
if hasattr(self.__dict__[strAttrName], '__set__'):
self.__dict__[strAttrName].__set__(self, gValue)
else:
self.__dict__[strAttrName] = gValue
elif hasattr(self, strAttrName):
for objParent in self.__class__.__mro__:
if strAttrName in objParent.__dict__.keys():
gAttrValue = objParent.__dict__[strAttrName]
bCond1 = hasattr(gAttrValue, '__set__')
bCond2 = isinstance(gAttrValue, (classmethod, staticmethod,
property, types.MethodType,
types.FunctionType))
if bCond1:
try:
gAttrValue.__set__(self, gValue)
except Exception as err:
if isinstance(err, ConstantAttributeAssignment):
raise ConstantAttributeAssignment(strAttrName,
objClass, iSkipFrames = 1)
else:
raise CustomAttributeError(strAttrName, objClass,
iSkipFrames= 1)
elif bCond2:
raise CustomAttributeError(strAttrName, objClass,
iSkipFrames = 1)
else:
type.__setattr__(objParent, strAttrName, gValue)
else:
self.__dict__[strAttrName] = gValue
def __delattr__(objCaller, strAttrName):
"""
Special magic method hooking the deletion of an attribute on the class
level using a class object (without instantiation). Does not allow
deletion of any attribute.
Signature:
class A, str -> None
Args:
objCaller: class A, the class object, to which this method is
applied
strAttrName: str, name of an attribute to delete
Raises:
libexceptions.PrivateAttributeAccess: denied deletion of a protected
attribute
libexceptions.CustomAttributeError: denied deletion of a public or
magic attribute
libexceptions.NotExistingAttribute: denied deletion of a
non-existing attribute
Version 1.0.0.0
"""
bCond1 = strAttrName.startswith('_')
bCond2 = not strAttrName.startswith('__')
bCond3 = not strAttrName.startswith('_abc_')
if bCond1 and bCond2 and bCond3:
raise PrivateAttributeAccess(strAttrName, objCaller, iSkipFrames= 1)
if hasattr(objCaller, strAttrName):
raise CustomAttributeError(strAttrName, objCaller, iSkipFrames = 1)
else:
raise NotExistingAttribute(strAttrName, objCaller, iSkipFrames = 1)
def __setattr__(objCaller, strAttrName, gValue):
"""
Special magic method hooking the modification of an attribute access on
the class level using a class object (without instantiation). Does not
allow modification of the attributes with the names starting with a
single underscore, excepting those starting with the '_abc_' string or
more than one undescore.
Signature:
class A, str, type A -> None
Args:
objCaller: class A, the class object, to which this method is
applied
strAttrName: str, name of an attribute to modify
gValue: type A, the value to assign
Raises:
libexceptions.PrivateAttributeAccess: denied access to a protected
attribute
libexceptions.CustomAttributeError: an existing attribute cannot be
modified, or such argument does not exist
libexceptions.NotExistingAttribute: the attribute does not exist
Version 1.0.0.0
"""
bCond1 = strAttrName.startswith('_')
bCond2 = not strAttrName.startswith('__')
bCond3 = not strAttrName.startswith('_abc_')
if bCond1 and bCond2 and bCond3:
raise PrivateAttributeAccess(strAttrName, objCaller, iSkipFrames= 1)
bModified = False
for objParent in objCaller.__mro__:
if strAttrName in objParent.__dict__.keys():
gAttrValue = objParent.__dict__[strAttrName]
bCond1 = hasattr(gAttrValue, '__set__')
bCond2 = isinstance(gAttrValue, (classmethod, staticmethod,
types.FunctionType))
bCond4 = isinstance(gAttrValue, property)
if bCond1:
try:
gAttrValue.__set__(objParent, gValue)
except Exception as err:
if isinstance(err, ConstantAttributeAssignment):
raise ConstantAttributeAssignment(strAttrName,
objCaller, iSkipFrames = 1)
else:
raise CustomAttributeError(strAttrName, objCaller,
iSkipFrames= 1)
elif (bCond4 and not bCond1) or (bCond2 and not bCond4):
raise CustomAttributeError(strAttrName, objCaller,
iSkipFrames = 1)
else:
type.__setattr__(objParent, strAttrName, gValue)
bModified = True
break
if not bModified:
raise NotExistingAttribute(strAttrName, objCaller, iSkipFrames = 1)
def __delattr__(objCaller, strAttrName):
"""
Special magic method hooking the deletion of an attribute on the class
level using a class object (without instantiation). Does not allow
deletion of the attributes with the names starting with a single
underscore, excepting those starting with the '_abc_' string or more
than one undescore.
Signature:
class A, str -> None
Args:
objCaller: class A, the class object, to which this method is
applied
strAttrName: str, name of an attribute to delete
Raises:
libexceptions.PrivateAttributeAccess: denied deletion of a protected
attribute
libexceptions.CustomAttributeError: denied deletion of a public or
magic attribute, e.g. method, property or an instance of a class
with __delete__ descriptor preventing deletion
libexceptions.NotExistingAttribute: denied deletion of a
non-existing attribute
Version 1.0.0.0
"""
bCond1 = strAttrName.startswith('_')
bCond2 = not strAttrName.startswith('__')
bCond3 = not strAttrName.startswith('_abc_')
if bCond1 and bCond2 and bCond3:
raise PrivateAttributeAccess(strAttrName, objCaller, iSkipFrames= 1)
if strAttrName in objCaller.__dict__.keys():
gAttrValue = objCaller.__dict__[strAttrName]
bCond1 = hasattr(gAttrValue, '__delete__')
bCond2 = isinstance(gAttrValue, (classmethod, staticmethod,
types.FunctionType, types.MethodType))
bCond4 = isinstance(gAttrValue, property)
if bCond1:
try:
gAttrValue.__delete__(objCaller)
except Exception as err:
if isinstance(err, ConstantAttributeAssignment):
raise ConstantAttributeAssignment(strAttrName,
objCaller, iSkipFrames = 1)
else:
raise CustomAttributeError(strAttrName, objCaller,
iSkipFrames= 1)
type.__setattr__(objCaller, strAttrName, None)
elif (bCond4 and not bCond1) or (bCond2 and not bCond4):
raise CustomAttributeError(strAttrName, objCaller,
iSkipFrames = 1)
type.__delattr__(objCaller, strAttrName)
del gAttrValue
elif hasattr(objCaller, strAttrName):
raise CustomAttributeError(strAttrName, objCaller, iSkipFrames = 1)
else:
raise NotExistingAttribute(strAttrName, objCaller, iSkipFrames = 1)
def __delattr__(self, strAttrName):
"""
Special magic method hooking the deletion of an attribute on the class
instance level. Does not allow deletion of the attributes with the names
starting with a single underscore, excepting those starting with more
than one undescore.
Signature:
str -> None
Args:
strAttrName: str, name of an attribute to delete
Raises:
libexceptions.PrivateAttributeAccess: denied access to a protected
attribute
libexceptions.CustomAttributeError: denied delition of an existing
class attribute, or of an existing instance attribute due to its
own desriptor limitation
libexceptions.NotExistingAttribute: the attribute does not exist
Version 1.0.0.0
"""
objClass = object.__getattribute__(self, '__class__')
bCond1 = strAttrName.startswith('_')
bCond2 = not strAttrName.startswith('__')
if bCond1 and bCond2:
raise PrivateAttributeAccess(strAttrName, objClass, iSkipFrames = 1)
if strAttrName in self.__dict__.keys():
gAttrValue = self.__dict__[strAttrName]
if hasattr(gAttrValue, '__delete__'):
try:
gAttrValue.__delete__(self)
except Exception as err:
if isinstance(err, ConstantAttributeAssignment):
raise ConstantAttributeAssignment(strAttrName,
objClass, iSkipFrames = 1)
else:
raise CustomAttributeError(strAttrName, objClass,
iSkipFrames= 1)
self.__dict__[strAttrName] = None
object.__delattr__(self, strAttrName)
del gAttrValue
elif hasattr(self, strAttrName):
raise CustomAttributeError(strAttrName, objClass, iSkipFrames = 1)
else:
raise NotExistingAttribute(strAttrName, objClass, iSkipFrames = 1)
def __getattribute__(self, strAttrName):
"""
Special magic method hooking the read access to an attribute on the
class instance level. Does not allow access to the attributes with the
names starting with a single underscore, excepting those starting with
more than one undescore.
Signature:
str -> type A
Args:
strAttrName: str, name of an attribute to access
Returns:
type A: the value of the attribute
Raises:
libexceptions.PrivateAttributeAccess: denied access to a protected
attribute
libexceptions.CustomAttributeError: denied read access to an
existing attribute, i.e. by its own desriptor
libexceptions.NotExistingAttribute: the attribute does not exist
Version 1.0.0.0
"""
objClass = object.__getattribute__(self, '__class__')
bLocked = object.__getattribute__(self, '__dict__').get('_bLocked',
False)
bCond1 = strAttrName.startswith('_')
bCond2 = not strAttrName.startswith('__')
if bCond1 and bCond2 and bLocked:
raise PrivateAttributeAccess(strAttrName, objClass, iSkipFrames = 1)
try:
gResult = object.__getattribute__(self, strAttrName)
except AttributeError:
raise NotExistingAttribute(strAttrName, objClass, iSkipFrames = 1)
#check if a descriptor but not a method
if (hasattr(gResult, '__get__') and
(not isinstance(gResult, types.FunctionType))):
try:
gResult = gResult.__get__(self, objClass)
except:
raise CustomAttributeError(strAttrName, objClass,
iSkipFrames = 1)
return gResult
def __getattribute__(objCaller, strAttrName):
"""
Special magic method hooking the read access to an attribute on the
class level using a class object (without instantiation). Does not allow
access to the attributes with the names starting with a single
underscore, excepting those starting with the '_abc_' string or more
than one undescore.
Signature:
class A, str -> type A
Args:
objCaller: class A, the class object, to which this method is
applied
strAttrName: str, name of an attribute to access
Returns:
type A: the value of the attribute
Raises:
libexceptions.PrivateAttributeAccess: denied access to a protected
attribute
libexceptions.NotExistingAttribute: non-existing attribute is
accessed
Version 1.0.0.0
"""
bCond1 = strAttrName.startswith('_')
bCond2 = not strAttrName.startswith('__')
bCond3 = not strAttrName.startswith('_abc_')
if bCond1 and bCond2 and bCond3:
raise PrivateAttributeAccess(strAttrName, objCaller, iSkipFrames= 1)
try:
gResult = type.__getattribute__(objCaller, strAttrName)
except AttributeError:
raise NotExistingAttribute(strAttrName, objCaller, iSkipFrames= 1)
return gResult