[TRNSYS-users] TRNSYS 18 : type 169 python

[Armandine Les Landes Antoine]

Hi Brandon,

Thank you very much for your reply !
I just tried to add the complete path to my script file as you mentionned but nothing changes…

Now I was looking on the dependency of Type 169.dll and it seems that one dependency is missing (TRNDLL64.DLL)…. ?
I guess that’s the reason why the type 169 does not work.

Best regards
Antoine

De : Brandon Hathaway <brandon.hathaway at sunvapor.net>
Envoyé : mercredi 1 juillet 2020 19:14
À : TRNSYS users mailing list at OneBuilding.org <trnsys-users at lists.onebuilding.org>
Cc : Armandine Les Landes Antoine <A.ArmandineLesLandes at brgm.fr>
Objet : Re: [TRNSYS-users] TRNSYS 18 : type 169 python

Hi Antoine,

I experienced the same behavior, and was able to trace down the cause with some digging into the Type169 source code.  In my case, it seemed that specifying the name of the Python script alone, rather than the complete path, was causing an issue when the code attempts to strip the script name and script path into separate variables.  The variable "scriptPath" contained just the name of the script, causing an undesired result when the Type169 code attempts to execute a "sys.path.append()" command through Python, resulting in the inability to Import the script.

I suspect that if you just specify the complete path to your script file in the entry box within the TRNSYS Type169 Special Cards configuration tab, rather than only the filename, the Type169 should work.  (However, the fix I ended up using since I was already into the source code is described below just in case anyone finds it helpful.)

In my case, I fixed the issue in the source code by commenting out the existing line that executes the above mentioned command around line 267:
// PyRun_SimpleString(scriptPath.c_str());

Then I added the following two lines which (1) import the OS module in the Python session then (2) use that module to get the current working directory and append it to the path:
PyRun_SimpleString("import os");
PyRun_SimpleString("sys.path.append(os.getcwd())");

After making those changes and recompiling the Type169.dll, my issue was resolved when specifying just the name of a script within the current working directory.  (Note, this makes it so that the script must ALWAYS be within the current working directory, as the path/filename stripping part of the code is now ignored.)

As for the TRNSYSpy module, it isn't a file, but is created within the Type169 program and appended to the Inittab just before python is initialized, which you'll see if you open the C++ source code around lines 262-264, so don't worry about that portion.

Best regards,
-Brandon

On Wed, Jul 1, 2020 at 4:12 AM Armandine Les Landes Antoine via TRNSYS-users <trnsys-users at lists.onebuilding.org<mailto:trnsys-users at lists.onebuilding.org>> wrote:
Hello all,

I am trying to use the python with the Type 169.

Note that :

-        Python 3 (3.7) is correclty installed and it is accessible from the cmd line.

-        TRNSYS is installed to the root of C :

-        Python is in the Windows path

-        …

I do not understand why nothing happen when I perform a simulation…

I can not find anywhere the TRNSyspy module ??

Could you provide an example of TRNSys using the Type 169 ? there is no example in TRNSYS18/Examples/.  such as Calling_Python ? that could help…

Thank you for you help !
Best regards,
Antoine

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