What do these lines print?>>> class User:>>> id = 89>>> name = "no name">>> __password = None>>> >>> def __init__(self, new_name=None):>>> self.is_new = True>>> if new_name is not None:>>> self.name = new_name>>> >>> u = User()>>> u.nameNone‘John’‘no name’nameI don't know
Question
What do these lines print?>>> class User:>>> id = 89>>> name = "no name">>> __password = None>>> >>> def init(self, new_name=None):>>> self.is_new = True>>> if new_name is not None:>>> self.name = new_name>>> >>> u = User()>>> u.nameNone‘John’‘no name’nameI don't know
Solution
The code defines a class User with class attributes id, name, and __password. It also has an instance method __init__ which is a special method in Python classes, known as a constructor. This method is called when an object is created from a class and it allows the class to initialize the attributes of the class.
The __init__ method checks if new_name is not None, and if so, it sets the name attribute to new_name. Otherwise, it leaves the name attribute as it is.
Then, an instance u of the User class is created without passing any argument to new_name. Therefore, new_name is None and the name attribute remains "no name".
So, when you print u.name, it will print "no name".
Similar Questions
In this following code, what is User?class User: id = 89 name = "no name" __password = None def __init__(self, new_name=None): self.is_new = True if new_name is not None: self.name = new_name
In this following code, what is is_new?class User: id = 89 name = "no name" __password = None def __init__(self, new_name=None): self.is_new = True if new_name is not None: self.name = new_name
In this following code, what is __password?class User: id = 89 name = "no name" __password = None def __init__(self, new_name=None): self.is_new = True if new_name is not None: self.name = new_name
What do these lines print?class Base(): """ My base class """ __nb_instances = 0 def __init__(self): Base.__nb_instances += 1 self.id = Base.__nb_instancesclass User(Base): """ My User class """ passu = User()print(u.id)
What do these lines print?class User: id = 1u = User()u.id = 89User.id = 98print(User.id)None18998
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