Check Null Value Using Python

fieldNullable = None
fieldNotNullable = 'Some Value'
fieldBoolean = False

if fieldNullable is None:
    print("fieldNullable is null/None")
else:
    print("fieldNullable is not null/None")

if fieldNotNullable is None:
    print("fieldNotNullable is null/None")
else:
    print("fieldNotNullable is not null/None")

if fieldBoolean is None:
    print("fieldBoolean is null/None")
else:
    print("fieldBoolean is not null/None")


class TheClass1:
    def __main__(self, theObject):
        self.theObject = theObject


theClass1 = TheClass1()
if theClass1 is None:
    print("theClass1 is null/None")
else:
    print("theClass1 is not null/None")
    
if theClass1 == None:
    print("theClass1 is null/None")
else:
    print("theClass1 is not null/None")






class TheClass2:
    def __eq__(self, theObject):
        self.theObject = theObject
        #Always return true when check using ==
        return True


theClass2 = TheClass2()
if theClass2 is None:
    print("theClass2 is null/None")
else:
    print("theClass2 is not null/None")
    
if theClass2 == None:
    print("theClass2 is null/None")
else:
    print("theClass2 is not null/None")   

fieldNullable is null/None
fieldNotNullable is not null/None
fieldBoolean is not null/None
theClass1 is not null/None
theClass1 is not null/None
theClass2 is not null/None
theClass2 is null/None