blueMaze -- just a hack to get to know the Pythonista graphics Scene class..

blueMaze.py

from scene import *
from random import random

class MyScene (Scene):
    def setup(self):
        # This will be called before the first frame is drawn.
        self.root_layer = Layer(self.bounds)
        self.mLines = []
        self.mCount = 0
        (self.mCurrLocX, self.mCurrLocY) = self.bounds.center()
        stroke_weight(2)
        stroke(0, 0, 0.5)

    def draw(self):
        # Update and draw our root layer. For a layer-based scene, this
        # is usually all you have to do in the draw method.
        currLoc = Point(self.mCurrLocX, self.mCurrLocY)
        if currLoc in self.bounds: # and len(self.mLines) < 8:
            lineLength = (self.mCount + 2) / 2 * 4 # 4, 4, 8, 8, 12, 12...
            theDirection = self.mCount % 4 # 0=E, 1=S, 2=W, 3=N
            self.mCount += 1               # turn right 90 degrees
            startLocX = self.mCurrLocX
            startLocY = self.mCurrLocY
            if theDirection == 0:   # head East
                self.mCurrLocX += lineLength
            elif theDirection == 1: # head South
                self.mCurrLocY -= lineLength
            elif theDirection == 2: # head West
                self.mCurrLocX -= lineLength
            else:                   # head North
                self.mCurrLocY += lineLength
            self.mLines.append((startLocX, startLocY,
                                self.mCurrLocX, self.mCurrLocY))
        for theLine in self.mLines:
            line(theLine[0], theLine[1], theLine[2], theLine[3])

    def touch_began(self, touch):
        pass
    
    def touch_moved(self, touch):
        pass
    
    def touch_ended(self, touch):
        pass

run(MyScene())