spiral drawing | Python Fiddle

import turtle

# Create a window object
window = turtle.Screen()
window.title("Drawing Pretty shapes")
window.bgcolor("lightgreen")

# create an animal object
tess = turtle.Turtle()
tess.color("blue")
tess.speed(0)
tess.pensize(3)

def draw_spiral (size, angle, turns):
    """
    Draw a spiral knowing its innermost side lenght 'size',
    the angle of turning 'angle' and the number of turns 'turns'
    """
    tess.right(90)  # Initially rotate tess to face downwards
    factor = size	# factor is the const by which the side length is increment
    
    # This code will solve the first drawing for the exercise
    # number 4.9-5 but not the second one for the python book 
    # thinkcspy3.pdf april-2018 edition page 77 located @ 
    # https://media.readthedocs.org/pdf/howtothink/latest/howtothink.pdf
    # I need a generalized code to solve both shapes.
    
    for _ in range(5*turns):
        tess.forward(size)
        tess.right(90)
        size = size + factor
        tess.right(angle)
        
draw_spiral(4, 90, 10)

window.mainloop()

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