User Interaction with RectangleTool

[Steven Silvester]

Hi Salvatore,

on_enter is expecting a function object, but you’ve passed the *result* of 
a function call. Here’s what it should look like:

def cable(extents):
   print(extents)

rect_tool = RectangleTool(ax,on_enter=cable)

Once you get it working, we’d love for you to submit a Pull Request with an 
example in the docstring for RectangleTool.

Regards,

Steve 
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