add events

docs/19_util/img.eps

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docs/19_util/intro.py

@@ -0,0 +1,11 @@
+# draw turtle graphics and record it to an animated GIF
+import turtle
+from PIL import Image
+
+turtle.forward(100)
+turtle.left(90)
+turtle.forward(100)
+
+turtle.done()
+
+