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Python Aptitude Test

Questions and answers

  1. Which statement about class methods is true?

    • A class methos is a regular funciton that belongs to a class, but it must return None
    • A class method is a similar to an regular funcion, but a class method does not take any arguments.
    • [x] A class method can modify the state of the class, but it cannot directly modify the state of an instance of that class
    • A class method holds all of the data for a particular class.

  2. Which statement about static class methods is true?

    • Static methods can be bound to either a class or an instance of a class.
    • [x] Static class methods serve mostly as utility or helper methods, since they cannot access or modify a class’s state.
    • Static class methods can access and modify the state of a class or an instance of a class.
    • Static class methods are called static because they always return None.

  3. How does defaultdict work?

    • [x] if you try to read from defaultdict with a noneexistent key, a new default key-value pair will be created for you instead throwing a KeyError.
    • defaultdict stores a copy of a dictionary in memory that you can default to if the original gets unintentionally modified.
    • defaultdict will automatically create a dictionary for you that has keys wich are the integers 0-10.
    • defaultdict forces a dictionary to only accept keys that are of the data type specified when you created the defaultdict (such as strings or integers).

  4. What is the correct syntax for creating a variable that bound a set?

    • [x] my_set = {0, 'apple',3.5}
    • my_set = to_set(0, 'apple',3.5)
    • my_set = (0, 'apple',3.5).set()
    • my_set = (0, 'apple',3.5).to_set()

  5. What is an abstract class?

    • Abstract classes must be redefined any time an object is instantiated from them.
    • [x] An Abstract class exist only so that other “concrete” classes can inherit from the abstract class.
    • Abstract classes must inherit from concrete classes.
    • An Abstract class is the name for any class from which you can instantiate an object.

  6. What is the purpose of the pass statement in Python?

    • It is used to skip the yield statement of a generator and return a value of None.
    • [x] It is a null operation used mainly as a placeholder in functions, classes, etc.
    • It is used to pass control from one statement block to another.
    • It is used to skip the rest of a while or for loop and return to the start of the loop.

  7. What is the diference between class attributes and instance atributes

    • Class attributes belong just to the class , not to instances of that class. Instance attributes are shared among all instances of a class.
    • Class attributes