problems with pf.add_py_function

[idalh]

Hi!
I am trying to add python function calls to PEST but currently not succeeding getting the call written to the .pst file. The python functions are added with:
pf.add_py_function("helpers.py",
"extract_hds_arrays_and_list_df(ws='.')",
is_pre_cmd=False)
But when writing the pst file it looks like this (and does not include any python calls):

PST file:
pcf version=2

• control data keyword
  pestmode estimation
  noptmax -1
  svdmode 1
  maxsing 10000000
  eigthresh 1e-06
  eigwrite 1
  ies_par_en prior.csv
• parameter groups external
  model.pargp_data.csv
• parameter data external
  model.par_data.csv
• observation data external
  model.obs_data.csv
• model command line
  runmodel.bat
• model input external
  model.tplfile_data.csv
• model output external
  model.insfile_data.csv

Extra info

1. The helpers.py file is placed in the same directory as the current working directory (and does not return any error when added)
2. I can add it to pf, which when running:
   print(pf.pre_py_cmds)
   print(pf.post_py_cmds)
   Returns the function calls.
3. In pst-handler in python (from the pst = pf.build()) includes a call to the forward_run.py but this is not included in the .pst file and the forward_run.py file looks fine.

It seems like I am missing something here in the writing of the pst file, but not sure what?
Hope somebody can help!

[p-ortega]

Hi @idalh

Python functions are written to forward_run.py and then the pst file should have this file path under *model command line
*model command line
python forward_run.py

Not sure what is not by default in your case.

[jtwhite79]

As @p-ortega suggests, pstfrom by default sets the control file model command as "forward_run.py". Are you changing this somewhere?

[idalh]

Hi!
So I found out what I was doing wrong (thanks for the replies). Here is the explanation incase somebody else runs into this issue, hopefully they don't.
If you choose to write your own batch script and change the pst model command with pst.model_command , like this:

if platform.platform().lower().startswith("win"):
    with open(os.path.join(workdir, 'runmodel.bat'), 'w+') as f:
        f.write('mf6\n')
        f.write('mpath7 model_wells.mpsim\n')
    pst.model_command = 'runmodel.bat'

It overwrites any python functions you might have added.