One balloon

import turtle
bob = turtle.Turtle()

bob.left(90) # to point Turtle up

bob.pencolor("black") # Sets the colour of the string
bob.forward(150) # Sets the length of the string
bob.pencolor("Red") # Set the colour of the balloon, in this case, red
bob.pensize(60) # This sets the size of the balloon, experiment...
bob.forward(1) # Draw the balloon
bob.pensize(1) # Reset the the pensize
bob.penup()
bob.backward(151) # Return Turtle to starting position
bob.pendown()