Remove .md and image files and move python files into main chapter folders

thinkcspy/Chapter-9-Exercises/Problem14.py

@@ -0,0 +1,61 @@
+# Runestone.Academy thinkcspy course
+# Chapter 9
+# Problem 14
+
+# Your code here
+import turtle
+
+def createLSystem(numIters,axiom):
+    startString = axiom
+    endString = ""
+    for i in range(numIters):
+        endString = processString(startString)
+        startString = endString
+
+    return endString
+
+def processString(oldStr):
+    newstr = ""
+    for ch in oldStr:
+        newstr = newstr + applyRules(ch)
+
+    return newstr
+
+def applyRules(ch):
+    newstr = ""
+    if ch == 'X':
+        newstr = 'X+YF+'   # Rule 1
+    elif ch == 'Y':
+        newstr = '-FX-Y'   # Rule 2
+    else:
+        newstr = ch    # no rules apply so keep the character
+
+    return newstr
+
+def drawLsystem(aTurtle, instructions, angle, distance):
+    for cmd in instructions:
+        if cmd == 'F':
+            aTurtle.forward(distance)
+        elif cmd == 'B':
+            aTurtle.backward(distance)
+        elif cmd == '+':
+            aTurtle.right(angle)
+        elif cmd == '-':
+            aTurtle.left(angle)
+
+def main():
+    inst = createLSystem(10, "FX")   # create the string
+    print(inst)
+    t = turtle.Turtle()            # create the turtle
+    wn = turtle.Screen()
+    wn.tracer(10)
+
+    t.up()
+    t.back(100)
+    t.down()
+    t.speed(0)
+    drawLsystem(t, inst, 90, 5)   # draw the picture
+                                  # angle 90, segment length 5
+    wn.exitonclick()
+
+main()