Understanding Event Functions and onStep in Python

Front

What is the purpose of the onStep function?

Back

To execute code once per second as defined by app.stepsPerSecond.

Front

How many times does onStep run if app.stepsPerSecond is set to 1? Options: Once per minute, Once per second, Twice per second, Ten times per second

Back

Once per second

Front

What data is accessible locally inside the function's implementation of def onMouseRelease(mouseX, mouseY):?

Back

mouseX, mouseY

Front

In python, which method is called to add data to the end of a list?

Back

append

Front

What is the meaning of the term mutability in computer programming?

Back

Mutability is the ability of an object to be changed after its creation.

Front

In your CMU CS Academy App, you have declared a python list named app.shapes. Each time the onStep function triggers, you want to traverse the entire list of shapes. What code would you write to make this happen? Options: while shape in app.shapes:, for shape in app.shapes: # perform actions with shape, foreach shape in app.shapes:, for shape in app.shapes()

Back

for shape in app.shapes:
# perform actions with shape

Front

what does it mean to traverse a data structure such as a python list?

Back

To traverse a Python list means to access each element in the list sequentially.

Front

You are creating a painting app in CMU CS Academy using Python. You want your app to have the ability for the user to set different modes like draw, change, move, and delete for objects on the canvas. You need to implement code in your onStep function to test which mode the user has selected. What code would you write given the 4 selections listed above?

Back

if mode == 'draw':
# code to draw
elif mode == 'change':
# code to change
elif mode == 'move':
# code to move
elif mode == 'delete':
# code to delete