Python Basics 2

What does variable scope refer to?

• The type of a variable

• The value of a variable

• Where a variable is accessible

• The name of a variable

Answer explanation

Variable scope refers to where a variable is accessible within the code. It determines the visibility and lifetime of a variable, making 'Where a variable is accessible' the correct choice.

Where are local scope variables defined?

• Outside functions

• Inside a function or block

• In the global environment

• In a class

Answer explanation

Local scope variables are defined inside a function or block, making them accessible only within that specific context. This ensures they do not interfere with variables in other scopes.

Which example represents Pascal Case?

• example_variable

• ExampleVariable

• exampleVariable

• strName

Answer explanation

Pascal Case capitalizes the first letter of each word without spaces. 'ExampleVariable' follows this rule, while the other options do not. 'example_variable' uses underscores, 'exampleVariable' is camel case, and 'strName' is also camel case.

What is the role of indentation in an if statement?

• It is optional.

• It defines the block of code to execute.

• It causes a syntax error.

• It is used for comments.

Answer explanation

Indentation is crucial in an if statement as it defines the block of code that will execute if the condition is true. Without proper indentation, the code may not run as intended, leading to logical errors.

What happens if there is no update statement inside a while loop?

• The loop will execute once

• The loop will run indefinitely

• The loop will not execute

• The loop will execute twice

Answer explanation

If there is no update statement inside a while loop, the loop's condition remains true, causing it to run indefinitely. This is known as an infinite loop, as it lacks a mechanism to exit.

What is the final step in the exercise instructions?

• Store Items

• Calculate Average

• Collect Input

• Create an Empty List

Answer explanation

The final step in the exercise instructions is to 'Calculate Average', which typically follows the collection of input data and is essential for summarizing the results.

What is the correct syntax to create a dictionary in Python?

• my_dict = [key1: value1, key2: value2]

• my_dict = {key1: value1, key2: value2}

• my_dict = (key1: value1, key2: value2)

• my_dict =

Answer explanation

The correct syntax to create a dictionary in Python is using curly braces. Therefore, 'my_dict = {key1: value1, key2: value2}' is the right choice, while the other options use incorrect syntax such as brackets or parentheses.

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

• It will return None

• It will raise a KeyError

• It will return an empty string

• It will create the key with a default value

Answer explanation

Accessing a non-existent key in a dictionary raises a KeyError. This error indicates that the key is not found, making 'It will raise a KeyError' the correct answer.

If you want to update the value of an existing key in a dictionary, what should you do?

• Use the update method

• Assign a new value to the key

• Use the append method

• Use the insert method

Answer explanation

To update the value of an existing key in a dictionary, simply assign a new value to that key. The update method is used for merging dictionaries, while append and insert are not applicable to dictionaries.

Which of the following is a correct way to check if a key 'grade' exists in a dictionary named student?

• 'grade' exists in student

• student.has('grade')

• 'grade' in student

• student.contains('grade')

Answer explanation

'grade' in student is the correct syntax to check for the existence of a key in a dictionary. The other options are incorrect as they do not follow Python's dictionary methods or syntax.