hacer una linea en python

 Pos = 0.0

def setup():  # setup() runs once

    size(800, 500)

    frameRate(30)

def draw():  # draw() loops forever, until stopped

    background(200)

    yPos = yPos - 1.0

    if yPos < 0:

    yPos = height

    line(0, yPos, width, yPos)

def setup():

    size(800, 400)

# Although empty here, draw() is needed so

# the sketch can process user input events

# (mouse presses in this case).

def draw():

    pass

def mousePressed():

   

    line(mouseX, 100, mouseX, 800)