The code is syntactically correct despite the fact that the names of the function parameters do not follow the naming convention

The *arg parameter holds a list of unnamed parameters.

The code is missing a placeholder for unnamed parameters.

The code is syntactically incorrect - the function should be defined as def f1 (*args, **kwargs):

There is only one initializer, so there is no need for a class method

The getNumberOfCrosswords() method Should be decorated with @classmethod

The code is erroneous

The getNumberOfCrosswords() and isSolved methods should be decorated with @classmethod

__ne__() is not a built-in special method.

The code is erroneous

The code is responsible for the support of the negation operator, e.g. a = - a

The code is responsible for the support of the inequality operator, i.e. !=

The == operator

The isinstance() function

The id() function

The is function

The @property decorator should be defined after the method that is responsible for setting an encapsulated attribute.

The @property decorator designates a method which is responsible for returning an attribute value.

The @property decorator marks the method whose name will be used as the name of the instance attribute.

The @property decorator should be defined before the methods that are responsible for setting and deleting an encapsulated attribute.