Programmiererforum

class Examples_Classes_Singletons :

_Instance = None

def __new__(CLS):

print(
"[  DEBUG  ] Creating Class : {} | Line : {} | Module : {}".format(
CLS, CLS.__firstlineno__, CLS.__module__
)
)

if CLS._Instance is None:

print(
f"[ WARNING ] No Instance Found ! Creating Instance For Class '{CLS.__name__}' ..."
)
CLS._Instance = super().__new__(CLS)

__Instance = f""
print(f"[  DEBUG  ] Instance : {__Instance}")

return CLS._Instance

def __init__(Self):

# print( Self.__class__.__mro__ == Self.__mro__ )
# print( type( Self ) == Examples_Classes_Singletons )

if "_initialized" in Self.__dict__ and Self._initialized:

print(
f"[  DEBUG  ] The Instance Of The Class '{Self.__class__.__name__}' Is Already Initialized !"
)
return

print(f"[  DEBUG  ] Configuring Standard Variables ...")

Self.Attribute_X = "TST1"  # Instance Variable
Self.Attribute_Y = "TST2"  # Instance Variable

Self._Protected_Attribute = {}
Self._Cache = []

# print( object.__getattribute__( Self , 'Attribute_X' ) )
# print( super( ).__getattribute__( 'Attribute_X' ) )

print(
f"[  DEBUG  ] Initializing The Instance For Class '{Self.__class__.__name__}' ..."
)

Self._initialized = True

def __getstate__(Self):

State = Self.__dict__.copy()

print(State)
State["_Protected_Attribute"] = None
if "_Cache" in State:
del State["_Cache"]

return State

def __setstate__(Self, State):

Self.__dict__.update(State)
# Self._Cache = { }

if __name__ == "__main__":
pass

T = Examples_Classes_Singletons()

T_Serialized = pickle.dumps(T)
T_Deserialized = pickle.loads(T_Serialized)

print(f"Serialized   : {T_Serialized}")
print(f"Deserialized : {T_Deserialized.__dict__}")

print(f"Deserialized : {T_Deserialized.__dict__}")

Deserialized : {'Attribute_X': 'TST1', 'Attribute_Y': 'TST2', '_Protected_Attribute': None, '_Cache': [], '_initialized': True}

Ich versuche herauszufinden, was mit meinem Code nicht stimmt, da das Ergebnis nicht meinen Erwartungen entspricht. Ich habe einfach versucht, die Methode __getstate__ einzuschließen, um Daten zu serialisieren. Das ist mein Code:
[code]class Examples_Classes_Singletons :

_Instance = None

def __new__(CLS):

print(
"[ DEBUG ] Creating Class : {} | Line : {} | Module : {}".format(
CLS, CLS.__firstlineno__, CLS.__module__
)
)

if CLS._Instance is None:

print(
f"[ WARNING ] No Instance Found ! Creating Instance For Class '{CLS.__name__}' ..."
)
CLS._Instance = super().__new__(CLS)

__Instance = f""
print(f"[ DEBUG ] Instance : {__Instance}")

return CLS._Instance

def __init__(Self):

# print( Self.__class__.__mro__ == Self.__mro__ )
# print( type( Self ) == Examples_Classes_Singletons )

if "_initialized" in Self.__dict__ and Self._initialized:

print(
f"[ DEBUG ] The Instance Of The Class '{Self.__class__.__name__}' Is Already Initialized !"
)
return

print(f"[ DEBUG ] Configuring Standard Variables ...")

Self.Attribute_X = "TST1" # Instance Variable
Self.Attribute_Y = "TST2" # Instance Variable

Self._Protected_Attribute = {}
Self._Cache = []

# print( object.__getattribute__( Self , 'Attribute_X' ) )
# print( super( ).__getattribute__( 'Attribute_X' ) )

print(
f"[ DEBUG ] Initializing The Instance For Class '{Self.__class__.__name__}' ..."
)

Self._initialized = True

def __getstate__(Self):

State = Self.__dict__.copy()

print(State)
State["_Protected_Attribute"] = None
if "_Cache" in State:
del State["_Cache"]

return State

def __setstate__(Self, State):

Self.__dict__.update(State)
# Self._Cache = { }

if __name__ == "__main__":
pass

T = Examples_Classes_Singletons()

T_Serialized = pickle.dumps(T)
T_Deserialized = pickle.loads(T_Serialized)

print(f"Serialized : {T_Serialized}")
print(f"Deserialized : {T_Deserialized.__dict__}")
[/code]
Wie Sie sehen, versuche ich, „_Protected_Attribute“ auf „None“ zu setzen und „_Cache“ zu entfernen, bevor ich die Daten serialisiere.
Obwohl ich mich tatsächlich an die Richtlinien gehalten habe, wird „_Cache“ nicht gelöscht. Wenn ich die Daten drucke nach:
[code]print(f"Deserialized : {T_Deserialized.__dict__}")
[/code]
das Ergebnis ist:
[code]Deserialized : {'Attribute_X': 'TST1', 'Attribute_Y': 'TST2', '_Protected_Attribute': None, '_Cache': [], '_initialized': True}
[/code]
'_Cache' ist noch verfügbar.
Ist der Code falsch oder habe ich die Syntax von __getstate__ falsch verstanden?