Python and Turtle Graphics

####Pattern 4
step = 100
length = 100
angle = 120    
def drawSquare(length,turn):
    for i in range (0,step):
        for b in range (0,2):
            turtle.forward(length+i*2)
            turtle.right(angle+b)   

####Pattern 3
step = 100
length = 100
angle = 90    
def drawSquare(length,turn):
    for i in range (0,step):
        for b in range (0,2):
            turtle.forward(length+i*2)
            turtle.right(angle+b)

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####Pattern 2
step = 100
length = 100
for x in range (0,2):
    angle = x*100
def drawSquare(length,turn):
    for i in range (0,step):
        for b in range (0,2):
            turtle.forward(length+i*2)
            turtle.right(angle+b)

####Pattern 1
step = 100
length = 100
angle = 90
def drawSquare(length,turn):
    for i in range (0,step):
        for b in range (0,4):
            turtle.forward(length+i)
            turtle.right(angle+b)

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