Planet sim and Etch added, working properly AFAIK

Turtle/Etch/etch_a_sketch_turtle.py

@@ -0,0 +1,101 @@
+from turtle import Turtle, mainloop
+
+
+class Etch:
+    def __init__(self):
+        self.__t = Turtle()
+        self.__screen = self.__t.screen
+        self.__color_list = ['#35b070', 'black', 'white', 'red', 'orange', 'yellow', 'green', 'blue', 'purple', 'pink']
+        self.__color_index = 0
+        self.__t.color(self.__color_list[self.__color_index])
+        self.__t.pensize(1)
+        self.__t.speed(0)
+        self.__distance = 10
+        self.__turn = 10
+
+        # Add callbacks
+        self.__screen.onkey(self.__fwd, 'w')
+        self.__screen.onkey(self.__back, 's')
+        self.__screen.onkey(self.__left, 'a')
+        self.__screen.onkey(self.__right, 'd')
+        self.__screen.onkey(self.__increase_distance, 'e')
+        self.__screen.onkey(self.__decrease_distance, 'q')
+        self.__screen.onkey(self.__increase_turn, 'r')
+        self.__screen.onkey(self.__decrease_turn, 'f')
+        self.__screen.onkey(self.__toggle_pen, 'z')
+        self.__screen.onkey(self.__color, 'c')
+        self.__screen.onkey(self.__clear, 'x')
+        self.__screen.onkey(self.__quit, 'Escape')
+        self.__screen.listen()
+
+
+    def main(self):
+        mainloop()
+
+    # Callback methods
+    def __increase_distance(self):
+        if self.__distance == 100:
+            pass
+        elif self.__distance < 5:
+            self.__distance += 1
+        else:
+            self.__distance += 5
+
+    def __decrease_distance(self):
+        if self.__distance == 1:
+            pass
+        elif self.__distance <= 5:
+            self.__distance -= 1
+        else:
+            self.__distance -= 5
+
+    def __increase_turn(self):
+        if self.__turn == 180:
+            pass
+        elif self.__turn < 5:
+            self.__turn += 1
+        else:
+            self.__turn += 5
+
+    def __decrease_turn(self):
+        if self.__turn == 1:
+            pass
+        elif self.__turn <= 5:
+            self.__turn -= 1
+        else:
+            self.__turn -= 5
+
+    def __fwd(self):
+        self.__t.forward(self.__distance)
+
+    def __back(self):
+        self.__t.backward(self.__distance)
+
+    def __left(self):
+        self.__t.left(self.__turn)
+
+    def __right(self):
+        self.__t.right(self.__turn)
+
+    def __toggle_pen(self):
+        if self.__t.isdown():
+            self.__t.penup()
+        else:
+            self.__t.pendown()
+
+    def __clear(self):
+        self.__t.clear()
+
+    def __color(self):
+        if self.__color_index == 9:
+            self.__color_index = -1
+        self.__color_index += 1
+        self.__t.color(self.__color_list[self.__color_index])
+
+    def __quit(self):
+        exit(0)
+
+
+if __name__ == '__main__':
+    draw = Etch()
+    draw.main()