meta: add turtle/matplotlib examples by Critor

ports/sh/examples/ex_plot.py

@@ -0,0 +1,7 @@
+from matplotl import *
+
+x = [119.1, 119.3, 119.5, 119.6, 119.9, 120.0, 120.1, 120.3, 120.4]
+y = [1, 3, 4, 3, 1, 3, 1, 3, 1]
+
+bar(x, y, 0.08)
+show()

ports/sh/examples/ex_turtle.py

@@ -0,0 +1,23 @@
+import turtle
+from math import exp
+
+def try_colormode(m):
+  try: turtle.colormode(m)
+  except: pass
+def try_pencolor(c):
+  try: turtle.pencolor(c)
+  except: pass
+  try: turtle.color(c)
+  except: pass
+
+try_colormode(1)
+turtle.penup()
+turtle.goto(0, -20)
+turtle.pendown()
+for i in range(1,37):
+  red=(exp(-0.5 * ((i-6)/12)**2))
+  green=(exp(-0.5 * ((i-18)/12)**2))
+  blue=(exp(-0.5 * ((i-30)/12)**2))
+  try_pencolor([red,green,blue])
+  turtle.circle(50-i)
+  turtle.right(10)