vtk wrapping xml reading and class creation

gistfile1.txt

         2892199 function calls (2868430 primitive calls) in 3.761 seconds

   Ordered by: cumulative time
   List reduced from 70 to 20 due to restriction <20>

   ncalls  tottime  percall  cumtime  percall filename:lineno(function)
        1    0.026    0.026    3.774    3.774 init.py:94(_init)
        1    0.004    0.004    2.758    2.758 specs.py:57(read_from_xml)
     1806    0.009    0.000    2.191    0.001 specs.py:250(from_xml)
     1806    0.064    0.000    2.135    0.001 specs.py:151(from_xml)
    14534    0.695    0.000    1.967    0.000 specs.py:323(internal_from_xml)
     8382    0.009    0.000    1.178    0.000 specs.py:373(from_xml)
     1806    0.205    0.000    0.989    0.001 init.py:51(gen_module)
    29068    0.504    0.000    0.825    0.000 specs.py:283(set_defaults)
     6152    0.007    0.000    0.805    0.000 specs.py:493(from_xml)
    31651    0.098    0.000    0.777    0.000 ast.py:40(literal_eval)
        1    0.000    0.000    0.563    0.563 <string>:60(parse)
        1    0.000    0.000    0.563    0.563 <string>:23(parse)
        1    0.563    0.563    0.563    0.563 {built-in method _parse}
    31651    0.028    0.000    0.510    0.000 ast.py:32(parse)
    14534    0.025    0.000    0.510    0.000 specs.py:278(__init__)
    31651    0.482    0.000    0.482    0.000 {compile}
    14534    0.062    0.000    0.481    0.000 specs.py:387(get_port_type)
    12304    0.030    0.000    0.413    0.000 specs.py:488(set_defaults)
     8382    0.014    0.000    0.253    0.000 specs.py:449(__init__)
   898905    0.217    0.000    0.217    0.000 {isinstance}