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Ever since I read Dave Beazley's post on binary I/O handling (http://dabeaz.blogspot.com/2009/08/python-binary-io-handling.html) I've wanted to create a Python library for a certain wire protocol. However, I can't find the best solution for variable length structures. Here's what I want to do: import ctypes as c class Point(c.Structure): _fields_ = [ ('x',c.c_double), ('y',c.c_double), ('z',c.c_double) ] class Points(c.Structure): _fields_ = [ ('num_points', c.c_uint32), ('points', Point*num_points) # num_points not yet defined! ] The class Points won't work since num_points isn't defined yet. I could redefine the _fields_ variable later once num_points is known, but since it's a class variable it would effect all of the other Points instances. What is a pythonic solution to this problem?
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