Writing LP without solving problem

[Cristián Serpell]

Hi pyomo team,

Is there a known way to write the generated LP file of a problem, without starting the solving steps? I would like to use pyomo to formulate the model, write the instance as LP and then finish. Is it necessary to even create a solver instance? I already write the pprint version.

Thanks,

Cristián

[David Woodruff]

The pyomo convert command is what you need. Try

pyomo convert -h

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[William Hart]

Use the 'pyomo convert' subcommand:

  pyomo convert --format=lp model.py

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[Cristián Serpell]

Can I instantiate that command from a python program using a concrete model?

Thanks for your fast response,

Cristián

[Gabriel Hackebeil]

I believe the PyomoModel object has a “write” method on it. It will try to infer the format you want by looking at the suffix you give the file name. E.g., instance.write(‘junk.lp’). If you want to see variable names rather than shortened symbols in the LP file you would add the keyword ‘io_options={‘symbolic_solver_labels’:True}”.

Gabe

[Cristián Serpell]

Ahh! It is true, I had that code somewhere and had lost it. Thanks a lot, it works perfectly.