CMU Unit 1 Practice Test

All of the following are types of errors EXCEPT:

• Syntax Error

• Logical Error

• Cascade Error

• Runtime Error

Logical Error

• Code follows the rules of Python and runs, but crashes after it starts.

• Code doesn't run because program doesn't follow the rules of Python.

• Code runs, but doesn't do what we want it to do.

• Code runs and works perfectly.

Runtime Error

• Code follows the rules of Python and runs, but crashes after it starts.

• Code doesn't run because program doesn't follow the rules of Python.

• Code runs, but doesn't do what we want it to do.

• Code runs and works perfectly.

Syntax Error

• Code follows the rules of Python and runs, but crashes after it starts.

• Code doesn't run because program doesn't follow the rules of Python.

• Code runs, but doesn't do what we want it to do.

• Code runs and works perfectly.

Which of the following has an error?

• Rect(50, 50, 200, 300, fill='dodgerBlue')

• Line(0, 200, 400, 200)

• Circle(300, 200, 75, fill='crimson')

• RegularPolygon(200 200 20 3)

Answer explanation

The Rect has no commas between the numbers. This command is not following the rules of Python - it is a syntax error!

Which of the following has an error?

• Circle(200, 200, fill='black')

• Line(0, 200, 400, 200, lineWidth=2)

• Polygon(100, 100, 150, 150, 200, 200, fill='blue')

• Rect(0,0,100,200,fill=None)

Answer explanation

The circle command takes a minimum of 3 inputs: Circle(centerX, centerY, radius). This was missing the radius number - a syntax error.

Which of the following has an error?

• Polygon(100, 200, 300, 300, fill=None)

• Circle(-100, -100, 200, fill=gradient('red', 'orange', 'yellow',

  start='left-top'))

• Rect(350, 50, 50, 50, fill='blue', borderWidth=5)

• Polygon(150, 160, 180)

Answer explanation

To draw a polygon with code, we write: Polygon(x1, y1, x2, y2, x3, y3, …). It must have an even number of coordinates! For this question, we wrote x1, y1,x2, but we forgot to put y2! This is not following the rules of Python - a syntax error.

Which of the following has a logical error? We are trying to draw a blue circle centered at (300, 350).

• Circle(300, 350, 40, fill='blue)

• Oval(300, 350, 40, 40, fill='blue)

• Oval(40, 40, 300, 350, fill='blue)

• Circle(300, 350, 80, fill='blue)

Answer explanation

Oval(40, 40, 300, 350, fill='blue) draws an oval centered at (40, 40) with a width and height of 300 and 350 respectively. The code runs, but it doesn't do what we want - a logical error!

What's the name of the place where we write all of our code.

• IDE (Integrated Development Environment)

• Google Docs

• CCW (Cloud-based Coding Window)

• AFE (Agile Framework Executable)

What do we call this part of the IDE?

• Console

• Canvas

• Shell Prompt

• Window

Answer explanation

The console is where Python sends messages to you. We normally use it to find out about an error in the code.