Assignment 4_1

'''
A program which asks the user to enter a command like f for fire and q for quit and if the user enter f it shoots a ball and shows how it drops down gradually.
'''
print('question 1:')
import turtle
s=turtle.Screen()
s.setup(width=.75, height=0.5, startx=50, starty=50)
def f():
    t=turtle.Turtle()
    t.shape("circle")
    t.color("white", "red")
    #t.begin_fill()
    s.delay(100)
    for z in range(10):
        x=50.0*z
        y=-5.0*(z**2)
        t.goto(x,y)
    #t.end_fill()
def q():
    s.clearscreen()
s.onkey(f, 'f')
s.onkey(q, 'q')
s.listen()
turtle.done()