Understanding Python Methods and Dictionaries

What is a dictionary in Python?

• A dictionary is a function in Python.

• A dictionary in Python is a collection of key-value pairs.

• A dictionary is a type of list in Python.

• A dictionary in Python is a single value.

How do you create a dictionary in Python?

• You can create a dictionary in Python using curly braces, like this: my_dict = {'key1': 'value1', 'key2': 'value2'}.

• You can create a dictionary using square brackets, like this: my_dict = ['key1': 'value1', 'key2': 'value2'].

• You create a dictionary by assigning values to a variable, like this: my_dict = 'key1', 'value1', 'key2', 'value2'

• Dictionaries can only be created using the dict() function: my_dict = dict(key1='value1', key2='value2').

What is the difference between a static method and an instance method?

• A static method can only be used in the main program, while an instance method can be used anywhere.

• An instance method can be called without creating an object, while a static method requires an object.

• A static method is called on the class itself, while an instance method is called on an object of the class.

• Static methods can access instance variables directly, while instance methods cannot.

What keyword is used to define a static method in a class?

• static

• final

• class

• method

Can instance methods access class variables?

• No, instance methods cannot access class variables.

• Only static methods can access class variables.

• Yes, instance methods can access class variables.

• Instance methods can only access instance variables.

What is the purpose of the 'self' parameter in instance methods?

• The 'self' parameter allows instance methods to access instance attributes and methods.

• The 'self' parameter is a keyword for defining global variables.

• The 'self' parameter is used for static methods.

• The 'self' parameter is required for class-level attributes.

How do you call a class method from an instance of the class?

• instance.methodName()

• instance.callMethod()

• methodName.instance()

• instance->methodName()

What will happen if you try to access a dictionary key that does not exist?

• A KeyError exception is raised.

• A ValueError exception is raised.

• The program will return None.

• The dictionary will automatically create the key with a default value.

How can you safely retrieve a value from a dictionary without raising an error?

• Use dictionary[key] to retrieve a value directly.

• Check if the key exists before accessing it.

• Use dictionary.get(key, default_value) to safely retrieve a value.

• Use dictionary.keys() to get the value.

What is the output of the following code: `d = {'a': 1}; print(d.get('b', 0))`?

• None

• 0

• KeyError

• 1