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6 - Create a Universe (tutorial + test)

 1. I have worked through the following presentation, attempting all challenges.

  FALSE

  TRUE

 2. Why will the following code produce an error and fail to create any molecules on the screen? 
import turtle
def draw_circle(turtle, color, size, x, y):
    turtle.penup()
    turtle.color(color)
    turtle.fillcolor(color)
    turtle.goto(x,y)
    turtle.begin_fill()
    turtle.pendown()
    turtle.circle(size)
    turtle.penup()
    turtle.end_fill()
    turtle.pendown()
tommy = turtle.Turtle()
tommy.shape("turtle")
tommy.speed(500)

#create variables

xaxis=-150
yaxis=150
offset=30

for i in range(5): 
  draw_circle(tommy, "green", size, xaxis, yaxis-offset*i)
  draw_circle(tommy, "green", size, xaxis+offset*i, yaxis-120)

 3. The following code produces a green molecule on the screen, but we want a red one. What one thing needs to change? 
import turtle
def draw_circle(turtle, color, size, x, y):
    turtle.penup()
    turtle.color(color)
    turtle.fillcolor(color)
    turtle.goto(x,y)
    turtle.begin_fill()
    turtle.pendown()
    turtle.circle(size)
    turtle.penup()
    turtle.end_fill()
    turtle.pendown()

tommy = turtle.Turtle()
tommy.shape("turtle")
tommy.speed(500)

#create variables
colour="red"
size=30
xaxis=-150
yaxis=130
offset=30

draw_circle(tommy, "green", size, xaxis, yaxis)

  draw_circle(tommy, "colour", size, xaxis, yaxis)

  draw_circle(tommy, red variable, size, xaxis, yaxis)

  draw_circle(tommy, colour="red", size, xaxis, yaxis)

  draw_circle(tommy, colour, size, xaxis, yaxis)

 4. The last two lines of this program should print two green molecules on the screen (separate from each other) but this is not happening. Why? 
import turtle
def draw_circle(turtle, color, size, x, y):
    turtle.penup()
    turtle.color(color)
    turtle.fillcolor(color)
    turtle.goto(x,y)
    turtle.begin_fill()
    turtle.pendown()
    turtle.circle(size)
    turtle.penup()
    turtle.end_fill()
    turtle.pendown()

tommy = turtle.Turtle()
tommy.shape("turtle")
tommy.speed(500)

#create variables
colour="red"
size=30
xaxis=-150
yaxis=130
offset=30

draw_circle(tommy, "green", size, xaxis, yaxis)
draw_circle(tommy, "green", size, xaxis, yaxis)

  Because both molecules have been created in the same location (on top of each other)

  Because the size of the molecules are too great

  Because both molecules have the same offset value, which means they will not move

  Because the colour variable has been assigned incorrectly

 5. Look carefully at the following code. What will be printed to the screen? 
import turtle
def draw_circle(turtle, color, size, x, y):
    turtle.penup()
    turtle.color(color)
    turtle.fillcolor(color)
    turtle.goto(x,y)
    turtle.begin_fill()
    turtle.pendown()
    turtle.circle(size)
    turtle.penup()
    turtle.end_fill()
    turtle.pendown()
tommy = turtle.Turtle()
tommy.shape("turtle")
tommy.speed(500)

#create variables
size=4
xaxis=-150
yaxis=150
offset=30

for i in range(5): 
  draw_circle(tommy, "green", size, xaxis, yaxis-offset*i)
  draw_circle(tommy, "green", size, xaxis+offset*i, yaxis-120)
  draw_circle(tommy, "green", size, xaxis+120, yaxis-offset*i)

  An X shape

  A square

  A U shape

  A triangle

 6. On what line is the user being asked for input (e.g. to enter the value to be stored in a variable) 
import turtle
def draw_circle(turtle, color, size, x, y):
    turtle.penup()
    turtle.color(color)
    turtle.fillcolor(color)
    turtle.goto(x,y)
    turtle.begin_fill()
    turtle.pendown()
    turtle.circle(size)
    turtle.penup()
    turtle.end_fill()
    turtle.pendown()
tommy = turtle.Turtle()
tommy.shape("turtle")
tommy.speed(500)
#create variables
colour="green"
size=int(input("Enter size:"))
xaxis=-150
yaxis=150
offset=30

if size>5: #if the size is greater than 5
  colour="red" #change the colour of the molecule to red
for i in range(5): 
  
  draw_circle(tommy, colour, size, xaxis, yaxis-offset*i)

  18

  5

  1

  21

 7. What is wrong with this for loop? 
for i in range(7,15):
print(i)

  The first line should be indented

  Both lines should be on the same indent level

  The second line should be indented

  Nothing is wrong

 8. What will the output of this for loop be? 
for i in range(2,8):
  print(i)

  1,2,3,4,5,6,7

  2,8

  2,3,4,5,6,7

  2,7

 9. What will the output of this for loop be? 
for i in range(5):
  print(i)

  1,2,3,4

  4

  1,4,1,4

  0,1,2,3,4

 10. This code should produce a vertical line of green molecules, but doesn't. What one thing on the last line needs to be changed? 
import turtle
def draw_circle(turtle, color, size, x, y):
    turtle.penup()
    turtle.color(color)
    turtle.fillcolor(color)
    turtle.goto(x,y)
    turtle.begin_fill()
    turtle.pendown()
    turtle.circle(size)
    turtle.penup()
    turtle.end_fill()
    turtle.pendown()
tommy = turtle.Turtle()
tommy.shape("turtle")
tommy.speed(500)

#create variables
size=4
xaxis=-150
yaxis=150
offset=30

for i in range(6): 
  draw_circle(tommy, "green", size, xaxis, yaxis-offset*1)

  draw_circle(tommy, "green", size, xaxis, yaxis-offset*i)

  Nothing needs to change, it would work fine

  draw_circle(tommy, "green", size+i, xaxis, yaxis-offset*1)

  draw_circle(tommy, "green", size, xaxis, yaxis +offset*1)


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