Load a Python module and call its functions within Delphi code without ExecString

[araujoarthur 0]

I've been looking around for some way to call python functions (using Python4Delphi) within my delphi code without direct need for TPythonEngine.ExecStrings execution.

 

My base idea is to load a module, for instance, example.py looking like:

def DoExample(pStr: str) -> str:
    pStr = "Example: " + pStr
    return pStr

 

And call it like (disclaimer: example of behavior I'd like to have, not actual P4D behavior):

MyPythonEngine := TPythonEngine.Create(nil);
{necessary version, flags and LoadDll}
MyPythonModule := TPythonModule.Create(nil);
{necessary configs again}
MyImportedFunction := {Load the DoExample somehow and store it in this variable}
ResultOfMyImportedFunction := MyImportedFunction("This is an example"); {This should be Example: This is an example}

 

I could also achieve my goal by adapting the example.py:

 

import sys

def DoExample(pStr: str) -> str:
    pStr = "Example: " + pStr
    return pStr

DoExample(sys.argv[1])

And call it like I would in cli, still need to get its result.

I've intensively read the Demos and didn't find a reasonable answer to my problem. Also no documentation for further reading (or atleast I couldn't find it).

 

I don't know if this approach is possible due to lack of documentation so I'm looking for comments from people more familiar with the library.

 

Question was originally posted in StackOverflow.

 

tl;dr
I'd like load a python script, take one of its defined functions, call it within delphi and retrieve its result into a varaible.|

[pyscripter 796]

How about?

var SL := TStringList.Crete;
try
  SL.LoadFromFile('example.py');
  PyEngine.ExecStrings(SL);
  var Res := MainModule.DoExample('input');
finally
  SL.Free;
end;

 

[araujoarthur 0]

19 hours ago, pyscripter said:

How about?

var SL := TStringList.Crete;
try
  SL.LoadFromFile('example.py');
  PyEngine.ExecStrings(SL);
  var Res := MainModule.DoExample('input');
finally
  SL.Free;
end;

 

Lmao I wasn't expecting an answer from you. So based on your answer I can't (and don't need) to load individual functions? I assume MainModule is in the tree of PyEngine, how would this work in case of a package with multiple modules?

Thanks for your answer.

[pyscripter 796]

The sample code above uses VarPyth for high level access to python objects.

 

MainModule is custom variant wrapping the __main__ python module.   Unless you provide optional parameters to ExecStrings, the code is executed in the context of the __main__ module.