How to draw a scheme?

[Armando Serrano Lombillo]

Hello list, I have to develop an application and I have chosen python as my
programming language. I think that wxPython will be the best choice for the
GUI but I have some questions. One of the main things the user will have to
do is to build a scheme (diagram) of a system. The program must present the
user several types of nodes and connectors as building blocks for the
scheme. The user should be able to drag things around, click on the nodes to
see/modify it's properties... I have been reading the wxPython docs and
looking at the demo and haven't found any example of something quite like
what I'm describing, but I'm sure I'm not the first one to do something
similar, so... which control could I use for this task? Do I need to use any
additional package? Any help will be appreciated.

Armando Serrano.
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