[f2py] problems with parameters and common blocks

Hello,

I'm developing a python interface for an xml data set and an old fortran
program (xml -> python -> fortran). Because the main computation subroutine
needs many variables, the values are written to variables in common-blocks.
In this common blocks are also arrays that have the size of previously given
parameters. These parameters are just maximum values (e.g. a maximum amount
of sth to compute). So an arrays is initiated with the size 20 even though
there were just the first four entries set. In the subroutine, e.g.
for-loops just iterate over those four entries using a previously given
counter. My problem is that f2py just know the max value (which makes sense)
and so if i handover a python list with just those four values, there is an
system error:
SystemError: error return without exception set
0-th dimension must be fixed to 22 but got 4

Is there any possibilty to either change the parameters before the modul is
implemented or change the size of the arrays? I thought of using dummy
entries for the python lists, but this isn't my desired solution.

best regards,
Clemens Teichmann

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