PythonFfiException (PythonFfiException: Failed to import module excel_test)

[bmsrangel]

Hello, guys!

I'm trying to use the "openpyxl" Python package in a POC app and when I try to run the application, I have this exception thrown: "PythonFfiException (PythonFfiException: Failed to import module excel_test)".

I understand that this library requires the package "et_xmlfile", so I downloaded it and included it as well in the modules declaration under pubspec.yaml.

Also, I have Python 3.11.5 installed.

I understand this package is supposed to be used to import "pure Python modules". To be honest, I'm not really sure about what this means, so my apologies if my error is related to that and I'd appreciate any explanations about it.

This is my exception traceback:

My Flutter doctor:

Repository link with source code.

Thank you in advance!

[IVLIVS-III]

Hi @bmsrangel a pure Python module is any Python module that is implemented 100% in Python.
It must not have any extension modules.
Also its dependencies, et_xmlfile in your case, must be pure Python modules as well.

E.g. numpy is not a pure Python module, since a large part of it is implemented in C.

Your stacktrace indicates that the root cause is the missing pyexpat module.
If I recall correctly, this module is part of the Python standard library, so it should automatically be be included in the provided Python runtime and standard library.
However, I did a lot of development recently and haven't published a new version on pub.dev just yet.
So maybe you could try to use the current version of the Github main branch of this repository:

dependencies:
  python_ffi:
    git:
      url: git@github.com:IVLIVS-III/dart_python_ffi.git
      path: packages/python_ffi
      ref: f6eb62d8e78fb883ae5f8fc1133c985306d28067

And the same with dartpip:

dev_dependencies:
  dartpip:
    git:
      url: git@github.com:IVLIVS-III/dart_python_ffi.git
      path: packages/dartpip
      ref: f6eb62d8e78fb883ae5f8fc1133c985306d28067

To run this version of dartpip execute dart run dartpip … from the directory in which you have your pubspc.yaml file.

---

Calling dart run dartpip install openpyxl should include all dependencies like et_xmlfile automatically by now 🥳

That said, I will need to check if pyexpat is included or not.

[bmsrangel]

Thank you for your reply!

I'll try your new version, but I'm having another issue now:

This is how my dev dependencies look like. I've changed the link from SSH to HTTPS due to privilege errors.

dev_dependencies:
  flutter_test:
    sdk: flutter
  flutter_lints: ^2.0.0
  dartpip:
    git:
      url: https://github.com/IVLIVS-III/dart_python_ffi.git
      path: packages/dartpip
      ref: f6eb62d8e78fb883ae5f8fc1133c985306d28067

When I run the pub get command, I have this error:

[python_ffi_poc] flutter pub get
Resolving dependencies...
Because every version of dartpip from git depends on dartpip_solver any which doesn't exist (could not find package dartpip_solver at https://pub.dev), dartpip from git is forbidden.
So, because python_ffi_poc depends on dartpip from git, version solving failed.
exit code 69

Any ideas on how to solve it?

[IVLIVS-III]

Another thought: you can try to use your local installation of Python instead of the runtime that is bundled with python_ffi. To do this, locate the path to a file called something like libpython3.11.dylib on your system and provide this path as a parameter to the PythonFfi.instance.initialize(libPath: "path/to/libpython3.11.dylib").

If your local Python installation has pyexpat included, it might work that way.

[IVLIVS-III]

Thank you for your reply!

I'll try your new version, but I'm having another issue now:

This is how my dev dependencies look like. I've changed the link from SSH to HTTPS due to privilege errors.

dev_dependencies:

  flutter_test:

    sdk: flutter

  flutter_lints: ^2.0.0

  dartpip:

    git:

      url: https://github.com/IVLIVS-III/dart_python_ffi.git

      path: packages/dartpip

      ref: f6eb62d8e78fb883ae5f8fc1133c985306d28067

When I run the pub get command, I have this error:

[python_ffi_poc] flutter pub get

Resolving dependencies...

Because every version of dartpip from git depends on dartpip_solver any which doesn't exist (could not find package dartpip_solver at https://pub.dev), dartpip from git is forbidden.

So, because python_ffi_poc depends on dartpip from git, version solving failed.

exit code 69

Any ideas on how to solve it?

Ahhh yes, right. You should also add dartpip_solver as a dev_dependency from git:

dev_dependencies:
  dartpip_solver:
    git:
      url: https://github.com/IVLIVS-III/dart_python_ffi.git
      path: packages/dartpip_solver
      ref: f6eb62d8e78fb883ae5f8fc1133c985306d28067

[bmsrangel]

Sure! I wondered that, so I tried:

dev_dependencies:
  flutter_test:
    sdk: flutter
  flutter_lints: ^2.0.0
  dartpip_solver:
    git:
      url: https://github.com/IVLIVS-III/dart_python_ffi.git
      path: packages/dartpip_solver
      ref: f6eb62d8e78fb883ae5f8fc1133c985306d28067
  dartpip:
    git:
      url: https://github.com/IVLIVS-III/dart_python_ffi.git
      path: packages/dartpip
      ref: f6eb62d8e78fb883ae5f8fc1133c985306d28067

And the result:

[python_ffi_poc] flutter pub get
Resolving dependencies...
Because every version of dartpip from git depends on dartpip_solver from hosted and python_ffi_poc depends on dartpip_solver from git, dartpip from git is forbidden.
So, because python_ffi_poc depends on dartpip from git, version solving failed.
exit code 1

Am I missing anything?

[IVLIVS-III]

No, my bad. Since I'm doing big repository changes at the moment, not all interdependencies work at the moment.

You can solve this by adding a dependency override as well.

dependency_overrides:
  dartpip:
    git:
      url: https://github.com/IVLIVS-III/dart_python_ffi.git
      path: packages/dartpip
      ref: f6eb62d8e78fb883ae5f8fc1133c985306d28067
  dartpip_solver:
    git:
      url: https://github.com/IVLIVS-III/dart_python_ffi.git
      path: packages/dartpip_solver
      ref: f6eb62d8e78fb883ae5f8fc1133c985306d28067

You can put this at the bottom of your pubspec.yaml.

[bmsrangel]

Here we go again! LOL

dependencies:
  file_picker: ^5.5.0
  flutter:
    sdk: flutter
  python_ffi:
    git:
      url: https://github.com/IVLIVS-III/dart_python_ffi.git
      path: packages/python_ffi
      ref: f6eb62d8e78fb883ae5f8fc1133c985306d28067

dev_dependencies:
  flutter_lints: ^2.0.0
  dartpip: ^0.1.0

dependency_overrides:
  dartpip:
    git:
      url: https://github.com/IVLIVS-III/dart_python_ffi.git
      path: packages/dartpip
      ref: f6eb62d8e78fb883ae5f8fc1133c985306d28067
  dartpip_solver:
    git:
      url: https://github.com/IVLIVS-III/dart_python_ffi.git
      path: packages/dartpip_solver
      ref: f6eb62d8e78fb883ae5f8fc1133c985306d28067

Error message:

Resolving dependencies... (1.3s)
Note: collection is pinned to version 1.17.2 by flutter from the flutter SDK.
See https://dart.dev/go/sdk-version-pinning for details.


Because every version of dartpip_solver from git depends on collection ^1.18.0 and every version of flutter from sdk depends on collection 1.17.2, dartpip_solver from git is incompatible with flutter from sdk.
So, because python_ffi_poc depends on both flutter from sdk and dartpip_solver from git, version solving failed.

I've never seen this message before

[bmsrangel]

Got it! I've added a dependency override on the collection package from pub.dev. It managed to solve all dependencies.

I'll go ahead with the tests and I'll revert with the results.

Once again, thank you very much for your assistance!

[bmsrangel]

Well, I've tried to run the dartpip install on my target package and it returned the error below. Would it be related to the pure Python modules restriction?

I've also tried your suggestion of using my local Python, but the "libPath" argument is not available. There's only "package".

➜  python_ffi_poc git:(main) ✗ dart run dartpip install openpyxml
Building package executable... 
Failed to build dartpip:dartpip:
../../../../.pub-cache/git/dart_python_ffi-f6eb62d8e78fb883ae5f8fc1133c985306d28067/packages/dartpip/lib/module_bundle/module_bundle.dart:119:30: Error: Member not found: 'PythonFfiCPythonDart.decodePythonSourceEntity'.
        PythonFfiCPythonDart.decodePythonSourceEntity(data);
                             ^^^^^^^^^^^^^^^^^^^^^^^^
../../../../.pub-cache/git/dart_python_ffi-f6eb62d8e78fb883ae5f8fc1133c985306d28067/packages/dartpip/lib/util.dart:93:59: Error: The getter 'stdlibDir' isn't defined for the class 'PythonFfiDart'.
 - 'PythonFfiDart' is from 'package:python_ffi_dart/python_ffi_dart.dart' ('../../../../.pub-cache/hosted/pub.dev/python_ffi_dart-0.3.1/lib/python_ffi_dart.dart').
Try correcting the name to the name of an existing getter, or defining a getter or field named 'stdlibDir'.
  final String stdlibPath = (await PythonFfiDart.instance.stdlibDir).path;
                                                          ^^^^^^^^^
../../../../.pub-cache/git/dart_python_ffi-f6eb62d8e78fb883ae5f8fc1133c985306d28067/packages/dartpip_solver/lib/python_modules/packaging/requirements.g.dart:1137:24: Error: A constructor invocation can't have type arguments after the constructor name.
Try removing the type arguments or placing them after the class name.
        PythonIterator.from<Object?, PythonFfiDelegate<Object?>, Object?>(
                       ^^^^
../../../../.pub-cache/git/dart_python_ffi-f6eb62d8e78fb883ae5f8fc1133c985306d28067/packages/dartpip_solver/lib/python_modules/packaging/requirements.g.dart:1137:24: Error: Member not found: 'PythonIterator.from'.
        PythonIterator.from<Object?, PythonFfiDelegate<Object?>, Object?>(
                       ^^^^
../../../../.pub-cache/git/dart_python_ffi-f6eb62d8e78fb883ae5f8fc1133c985306d28067/packages/dartpip_solver/lib/python_modules/packaging/requirements.g.dart:1146:9: Error: The method 'transform' isn't defined for the class 'TypedIterator<dynamic>'.
 - 'TypedIterator' is from 'package:python_ffi_interface/python_ffi_interface.dart' ('../../../../.pub-cache/hosted/pub.dev/python_ffi_interface-0.1.1/lib/python_ffi_interface.dart').
Try correcting the name to the name of an existing method, or defining a method named 'transform'.
      ).transform((e) => e).cast<Object?>();
        ^^^^^^^^^
../../../../.pub-cache/git/dart_python_ffi-f6eb62d8e78fb883ae5f8fc1133c985306d28067/packages/dartpip/lib/interface_gen/src/inspect/type_string.dart:15:23: Error: The method 'getAttributeOrNull' isn't defined for the class 'PythonObjectInterface<PythonFfiDelegate<Object?>, Object?>'.
 - 'PythonObjectInterface' is from 'package:python_ffi_interface/python_ffi_interface.dart' ('../../../../.pub-cache/hosted/pub.dev/python_ffi_interface-0.1.1/lib/python_ffi_interface.dart').
 - 'PythonFfiDelegate' is from 'package:python_ffi_interface/python_ffi_interface.dart' ('../../../../.pub-cache/hosted/pub.dev/python_ffi_interface-0.1.1/lib/python_ffi_interface.dart').
 - 'Object' is from 'dart:core'.
Try correcting the name to the name of an existing method, or defining a method named 'getAttributeOrNull'.
        name: source?.getAttributeOrNull("__name__"),
                      ^^^^^^^^^^^^^^^^^^
../../../../.pub-cache/git/dart_python_ffi-f6eb62d8e78fb883ae5f8fc1133c985306d28067/packages/dartpip/lib/interface_gen/src/inspect/type_string.dart:16:27: Error: The method 'getAttributeOrNull' isn't defined for the class 'PythonObjectInterface<PythonFfiDelegate<Object?>, Object?>'.
 - 'PythonObjectInterface' is from 'package:python_ffi_interface/python_ffi_interface.dart' ('../../../../.pub-cache/hosted/pub.dev/python_ffi_interface-0.1.1/lib/python_ffi_interface.dart').
 - 'PythonFfiDelegate' is from 'package:python_ffi_interface/python_ffi_interface.dart' ('../../../../.pub-cache/hosted/pub.dev/python_ffi_interface-0.1.1/lib/python_ffi_interface.dart').
 - 'Object' is from 'dart:core'.
Try correcting the name to the name of an existing method, or defining a method named 'getAttributeOrNull'.
        qualname: source?.getAttributeOrNull("__qualname__"),
                          ^^^^^^^^^^^^^^^^^^
../../../../.pub-cache/git/dart_python_ffi-f6eb62d8e78fb883ae5f8fc1133c985306d28067/packages/dartpip/lib/interface_gen/src/inspect/type_string.dart:17:25: Error: The method 'getAttributeOrNull' isn't defined for the class 'PythonObjectInterface<PythonFfiDelegate<Object?>, Object?>'.
 - 'PythonObjectInterface' is from 'package:python_ffi_interface/python_ffi_interface.dart' ('../../../../.pub-cache/hosted/pub.dev/python_ffi_interface-0.1.1/lib/python_ffi_interface.dart').
 - 'PythonFfiDelegate' is from 'package:python_ffi_interface/python_ffi_interface.dart' ('../../../../.pub-cache/hosted/pub.dev/python_ffi_interface-0.1.1/lib/python_ffi_interface.dart').
 - 'Object' is from 'dart:core'.
Try correcting the name to the name of an existing method, or defining a method named 'getAttributeOrNull'.
        module: source?.getAttributeOrNull("__module__"),
                        ^^^^^^^^^^^^^^^^^^
../../../../.pub-cache/git/dart_python_ffi-f6eb62d8e78fb883ae5f8fc1133c985306d28067/packages/dartpip/lib/interface_gen/src/inspect/type_string.dart:62:32: Error: Undefined name 'BuiltinsModule'.
    final Object? typeObject = BuiltinsModule.import().type(second);
                               ^^^^^^^^^^^^^^
../../../../.pub-cache/git/dart_python_ffi-f6eb62d8e78fb883ae5f8fc1133c985306d28067/packages/dartpip/lib/interface_gen/src/inspect/type_string.dart:84:30: Error: Undefined name 'BuiltinsModule'.
  final Object? typeObject = BuiltinsModule.import().type(object);
                             ^^^^^^^^^^^^^^
../../../../.pub-cache/git/dart_python_ffi-f6eb62d8e78fb883ae5f8fc1133c985306d28067/packages/dartpip/lib/interface_gen/modules/ast/src/ast.dart:213:9: Error: The method 'transform' isn't defined for the class 'TypedIterator<PythonClassInterface<PythonFfiDelegate<Object?>, Object?>>'.
 - 'TypedIterator' is from 'package:python_ffi_interface/python_ffi_interface.dart' ('../../../../.pub-cache/hosted/pub.dev/python_ffi_interface-0.1.1/lib/python_ffi_interface.dart').
 - 'PythonClassInterface' is from 'package:python_ffi_interface/python_ffi_interface.dart' ('../../../../.pub-cache/hosted/pub.dev/python_ffi_interface-0.1.1/lib/python_ffi_interface.dart').
 - 'PythonFfiDelegate' is from 'package:python_ffi_interface/python_ffi_interface.dart' ('../../../../.pub-cache/hosted/pub.dev/python_ffi_interface-0.1.1/lib/python_ffi_interface.dart').
 - 'Object' is from 'dart:core'.
Try correcting the name to the name of an existing method, or defining a method named 'transform'.
      ).transform(AST.from);
        ^^^^^^^^^
Failed to build dartpip:dartpip:
../../../../.pub-cache/git/dart_python_ffi-f6eb62d8e78fb883ae5f8fc1133c985306d28067/packages/dartpip/lib/module_bundle/module_bundle.dart:119:30: Error: Member not found: 'PythonFfiCPythonDart.decodePythonSourceEntity'.
        PythonFfiCPythonDart.decodePythonSourceEntity(data);
                             ^^^^^^^^^^^^^^^^^^^^^^^^
../../../../.pub-cache/git/dart_python_ffi-f6eb62d8e78fb883ae5f8fc1133c985306d28067/packages/dartpip/lib/util.dart:93:59: Error: The getter 'stdlibDir' isn't defined for the class 'PythonFfiDart'.
 - 'PythonFfiDart' is from 'package:python_ffi_dart/python_ffi_dart.dart' ('../../../../.pub-cache/hosted/pub.dev/python_ffi_dart-0.3.1/lib/python_ffi_dart.dart').
Try correcting the name to the name of an existing getter, or defining a getter or field named 'stdlibDir'.
  final String stdlibPath = (await PythonFfiDart.instance.stdlibDir).path;
                                                          ^^^^^^^^^
../../../../.pub-cache/git/dart_python_ffi-f6eb62d8e78fb883ae5f8fc1133c985306d28067/packages/dartpip_solver/lib/python_modules/packaging/requirements.g.dart:1137:24: Error: A constructor invocation can't have type arguments after the constructor name.
Try removing the type arguments or placing them after the class name.
        PythonIterator.from<Object?, PythonFfiDelegate<Object?>, Object?>(
                       ^^^^
../../../../.pub-cache/git/dart_python_ffi-f6eb62d8e78fb883ae5f8fc1133c985306d28067/packages/dartpip_solver/lib/python_modules/packaging/requirements.g.dart:1137:24: Error: Member not found: 'PythonIterator.from'.
        PythonIterator.from<Object?, PythonFfiDelegate<Object?>, Object?>(
                       ^^^^
../../../../.pub-cache/git/dart_python_ffi-f6eb62d8e78fb883ae5f8fc1133c985306d28067/packages/dartpip_solver/lib/python_modules/packaging/requirements.g.dart:1146:9: Error: The method 'transform' isn't defined for the class 'TypedIterator<dynamic>'.
 - 'TypedIterator' is from 'package:python_ffi_interface/python_ffi_interface.dart' ('../../../../.pub-cache/hosted/pub.dev/python_ffi_interface-0.1.1/lib/python_ffi_interface.dart').
Try correcting the name to the name of an existing method, or defining a method named 'transform'.
      ).transform((e) => e).cast<Object?>();
        ^^^^^^^^^
../../../../.pub-cache/git/dart_python_ffi-f6eb62d8e78fb883ae5f8fc1133c985306d28067/packages/dartpip/lib/interface_gen/src/inspect/type_string.dart:15:23: Error: The method 'getAttributeOrNull' isn't defined for the class 'PythonObjectInterface<PythonFfiDelegate<Object?>, Object?>'.
 - 'PythonObjectInterface' is from 'package:python_ffi_interface/python_ffi_interface.dart' ('../../../../.pub-cache/hosted/pub.dev/python_ffi_interface-0.1.1/lib/python_ffi_interface.dart').
 - 'PythonFfiDelegate' is from 'package:python_ffi_interface/python_ffi_interface.dart' ('../../../../.pub-cache/hosted/pub.dev/python_ffi_interface-0.1.1/lib/python_ffi_interface.dart').
 - 'Object' is from 'dart:core'.
Try correcting the name to the name of an existing method, or defining a method named 'getAttributeOrNull'.
        name: source?.getAttributeOrNull("__name__"),
                      ^^^^^^^^^^^^^^^^^^
../../../../.pub-cache/git/dart_python_ffi-f6eb62d8e78fb883ae5f8fc1133c985306d28067/packages/dartpip/lib/interface_gen/src/inspect/type_string.dart:16:27: Error: The method 'getAttributeOrNull' isn't defined for the class 'PythonObjectInterface<PythonFfiDelegate<Object?>, Object?>'.
 - 'PythonObjectInterface' is from 'package:python_ffi_interface/python_ffi_interface.dart' ('../../../../.pub-cache/hosted/pub.dev/python_ffi_interface-0.1.1/lib/python_ffi_interface.dart').
 - 'PythonFfiDelegate' is from 'package:python_ffi_interface/python_ffi_interface.dart' ('../../../../.pub-cache/hosted/pub.dev/python_ffi_interface-0.1.1/lib/python_ffi_interface.dart').
 - 'Object' is from 'dart:core'.
Try correcting the name to the name of an existing method, or defining a method named 'getAttributeOrNull'.
        qualname: source?.getAttributeOrNull("__qualname__"),
                          ^^^^^^^^^^^^^^^^^^
../../../../.pub-cache/git/dart_python_ffi-f6eb62d8e78fb883ae5f8fc1133c985306d28067/packages/dartpip/lib/interface_gen/src/inspect/type_string.dart:17:25: Error: The method 'getAttributeOrNull' isn't defined for the class 'PythonObjectInterface<PythonFfiDelegate<Object?>, Object?>'.
 - 'PythonObjectInterface' is from 'package:python_ffi_interface/python_ffi_interface.dart' ('../../../../.pub-cache/hosted/pub.dev/python_ffi_interface-0.1.1/lib/python_ffi_interface.dart').
 - 'PythonFfiDelegate' is from 'package:python_ffi_interface/python_ffi_interface.dart' ('../../../../.pub-cache/hosted/pub.dev/python_ffi_interface-0.1.1/lib/python_ffi_interface.dart').
 - 'Object' is from 'dart:core'.
Try correcting the name to the name of an existing method, or defining a method named 'getAttributeOrNull'.
        module: source?.getAttributeOrNull("__module__"),
                        ^^^^^^^^^^^^^^^^^^
../../../../.pub-cache/git/dart_python_ffi-f6eb62d8e78fb883ae5f8fc1133c985306d28067/packages/dartpip/lib/interface_gen/src/inspect/type_string.dart:62:32: Error: Undefined name 'BuiltinsModule'.
    final Object? typeObject = BuiltinsModule.import().type(second);
                               ^^^^^^^^^^^^^^
../../../../.pub-cache/git/dart_python_ffi-f6eb62d8e78fb883ae5f8fc1133c985306d28067/packages/dartpip/lib/interface_gen/src/inspect/type_string.dart:84:30: Error: Undefined name 'BuiltinsModule'.
  final Object? typeObject = BuiltinsModule.import().type(object);
                             ^^^^^^^^^^^^^^
../../../../.pub-cache/git/dart_python_ffi-f6eb62d8e78fb883ae5f8fc1133c985306d28067/packages/dartpip/lib/interface_gen/modules/ast/src/ast.dart:213:9: Error: The method 'transform' isn't defined for the class 'TypedIterator<PythonClassInterface<PythonFfiDelegate<Object?>, Object?>>'.
 - 'TypedIterator' is from 'package:python_ffi_interface/python_ffi_interface.dart' ('../../../../.pub-cache/hosted/pub.dev/python_ffi_interface-0.1.1/lib/python_ffi_interface.dart').
 - 'PythonClassInterface' is from 'package:python_ffi_interface/python_ffi_interface.dart' ('../../../../.pub-cache/hosted/pub.dev/python_ffi_interface-0.1.1/lib/python_ffi_interface.dart').
 - 'PythonFfiDelegate' is from 'package:python_ffi_interface/python_ffi_interface.dart' ('../../../../.pub-cache/hosted/pub.dev/python_ffi_interface-0.1.1/lib/python_ffi_interface.dart').
 - 'Object' is from 'dart:core'.
Try correcting the name to the name of an existing method, or defining a method named 'transform'.
      ).transform(AST.from);

[IVLIVS-III]

Ohh right, sorry, I got confused with the python_ffi_dart package.
That would be the equivalent when building a Dart-only console application without flutter. There you would be able to set the libPath.
I'm afraid there is no builtin option to use the local Python installation with the Flutter package python_ffi.

[IVLIVS-III]

And the error output indicates that you would need to pin even more packages via dependency overrides to the git version:

• python_ffi_interface
• python_ffi_cpython
• python_ffi_cpython_dart
• python_ffi_dart

[bmsrangel]

And the error output indicates that you would need to pin even more packages via dependency overrides to the git version:

• python_ffi_interface
• python_ffi_cpython
• python_ffi_cpython_dart
• python_ffi_dart

It does make sense, as it was necessary to reference dartpip_solver separately. Sorry, I should've noticed.

I'll try again then

Oh, and before I forget again: congratulations on your project! It's awesome!

[bmsrangel]

Here we are again!

This is how my pubspec.yaml looks now:

environment:
  sdk: ">=3.1.0 <4.0.0"

dependencies:
  file_picker: ^5.5.0
  flutter:
    sdk: flutter
  python_ffi: ^0.3.1

dev_dependencies:
  flutter_lints: ^2.0.0
  dartpip: ^0.1.0

dependency_overrides:
  collection: ^1.18.0
  dartpip:
    git:
      url: https://github.com/IVLIVS-III/dart_python_ffi.git
      path: packages/dartpip
      ref: f6eb62d8e78fb883ae5f8fc1133c985306d28067
  dartpip_solver:
    git:
      url: https://github.com/IVLIVS-III/dart_python_ffi.git
      path: packages/dartpip_solver
      ref: f6eb62d8e78fb883ae5f8fc1133c985306d28067
  python_ffi:
    git:
      url: https://github.com/IVLIVS-III/dart_python_ffi.git
      path: packages/python_ffi
      ref: f6eb62d8e78fb883ae5f8fc1133c985306d28067
  python_ffi_cpython:
    git:
      url: https://github.com/IVLIVS-III/dart_python_ffi.git
      path: packages/python_ffi_cpython
      ref: f6eb62d8e78fb883ae5f8fc1133c985306d28067
  python_ffi_interface:
    git:
      url: https://github.com/IVLIVS-III/dart_python_ffi.git
      path: packages/python_ffi_interface
      ref: f6eb62d8e78fb883ae5f8fc1133c985306d28067
  python_ffi_lint:
    git:
      url: https://github.com/IVLIVS-III/dart_python_ffi.git
      path: packages/python_ffi_lint
      ref: f6eb62d8e78fb883ae5f8fc1133c985306d28067

flutter:
  assets:
    - python-modules/excel_test.py
    - python-modules/basic_operations.py
    - python-modules/python_ffi.py
    - python-modules/modules.json
  uses-material-design: true

python_ffi:
  modules:
    basic_operations: any
    excel_test: any

After trying to run dart run dartpip install openpyxl and even the dart run dartpip bundle -r . -m python-modules, I have a big error message:

➜  python_ffi_poc git:(main) ✗ dart run dartpip install openpyxl             
Building package executable... 
Failed to build dartpip:dartpip:
../../../../.pub-cache/git/dart_python_ffi-f6eb62d8e78fb883ae5f8fc1133c985306d28067/packages/dartpip/lib/module_bundle/module_bundle.dart:119:30: Error: Member not found: 'PythonFfiCPythonDart.decodePythonSourceEntity'.
        PythonFfiCPythonDart.decodePythonSourceEntity(data);
                             ^^^^^^^^^^^^^^^^^^^^^^^^
../../../../.pub-cache/git/dart_python_ffi-f6eb62d8e78fb883ae5f8fc1133c985306d28067/packages/dartpip/lib/util.dart:93:59: Error: The getter 'stdlibDir' isn't defined for the class 'PythonFfiDart'.
 - 'PythonFfiDart' is from 'package:python_ffi_dart/python_ffi_dart.dart' ('../../../../.pub-cache/hosted/pub.dev/python_ffi_dart-0.3.1/lib/python_ffi_dart.dart').
Try correcting the name to the name of an existing getter, or defining a getter or field named 'stdlibDir'.
  final String stdlibPath = (await PythonFfiDart.instance.stdlibDir).path;
                                                          ^^^^^^^^^
../../../../.pub-cache/hosted/pub.dev/python_ffi_dart-0.3.1/lib/src/python_ffi_dart_base.dart:44:33: Error: Required named parameter 'package' must be provided.
      return delegate.initialize();
                                ^
../../../../.pub-cache/hosted/pub.dev/python_ffi_cpython_dart-0.3.1/lib/src/object.dart:6:5: Error: Type 'Pair' not found.
    Pair<PythonFfiCPythonBase, Pointer<PyObject>> value,
    ^^^^
../../../../.pub-cache/hosted/pub.dev/python_ffi_cpython_dart-0.3.1/lib/src/object.dart:17:5: Error: Type 'Pair' not found.
    Pair<PythonFfiDelegate<Object?>, Object?> value,
    ^^^^
../../../../.pub-cache/hosted/pub.dev/python_ffi_cpython_dart-0.3.1/lib/src/object.dart:26:26: Error: Type 'Pair' not found.
  static final Finalizer<Pair<PythonFfiDelegate<Object?>, Object?>> finalizer =
                         ^^^^
../../../../.pub-cache/hosted/pub.dev/python_ffi_cpython_dart-0.3.1/lib/src/python_ffi_cpython_dart_base.dart:139:10: Error: Type 'Pair' not found.
  static Pair<PythonSourceEntity, PythonSourceFileEntity?>
         ^^^^
../../../../.pub-cache/hosted/pub.dev/python_ffi_cpython_dart-0.3.1/lib/src/python_ffi_cpython_dart_base.dart:39:13: Error: The non-abstract class 'PythonFfiCPythonDart' is missing implementations for these members:
 - PythonFfiDelegate.stdlibDir
Try to either
 - provide an implementation,
 - inherit an implementation from a superclass or mixin,
 - mark the class as abstract, or
 - provide a 'noSuchMethod' implementation.

final class PythonFfiCPythonDart extends PythonFfiCPythonBase
            ^^^^^^^^^^^^^^^^^^^^
../../../../.pub-cache/git/dart_python_ffi-f6eb62d8e78fb883ae5f8fc1133c985306d28067/packages/python_ffi_interface/lib/src/delegate.dart:39:27: Context: 'PythonFfiDelegate.stdlibDir' is defined here.
  FutureOr<Directory> get stdlibDir;
                          ^^^^^^^^^
../../../../.pub-cache/hosted/pub.dev/python_ffi_cpython_dart-0.3.1/lib/src/python_ffi_cpython_dart_base.dart:311:16: Error: The method 'PythonFfiCPythonMixin.initialize' has fewer named arguments than those of overridden method 'PythonFfiDelegate.initialize'.
  Future<void> initialize() async {
               ^
../../../../.pub-cache/git/dart_python_ffi-f6eb62d8e78fb883ae5f8fc1133c985306d28067/packages/python_ffi_interface/lib/src/delegate.dart:32:18: Context: This is the overridden method ('initialize').
  FutureOr<void> initialize({required String? package}) async {
                 ^
../../../../.pub-cache/hosted/pub.dev/python_ffi_cpython_dart-0.3.1/lib/src/python_ffi_cpython_dart_base.dart:39:13: Error: Applying the mixin 'PythonFfiCPythonMixin' to 'PythonFfiCPythonBase' introduces an erroneous override of 'initialize'.
final class PythonFfiCPythonDart extends PythonFfiCPythonBase
            ^^^^^^^^^^^^^^^^^^^^
../../../../.pub-cache/hosted/pub.dev/python_ffi_cpython_dart-0.3.1/lib/src/python_ffi_cpython_dart_base.dart:311:16: Context: The method 'PythonFfiCPythonMixin.initialize' has fewer named arguments than those of overridden method 'PythonFfiDelegate.initialize'.
  Future<void> initialize() async {
               ^
../../../../.pub-cache/git/dart_python_ffi-f6eb62d8e78fb883ae5f8fc1133c985306d28067/packages/python_ffi_interface/lib/src/delegate.dart:32:18: Context: This is the overridden method ('initialize').
  FutureOr<void> initialize({required String? package}) async {
                 ^
../../../../.pub-cache/hosted/pub.dev/python_ffi_cpython_dart-0.3.1/lib/src/python_ffi_cpython_dart_base.dart:208:31: Error: The method 'PythonFfiCPythonDart.discoverPythonModules' has fewer named arguments than those of overridden method 'PythonFfiDelegate.discoverPythonModules'.
  Set<PythonModuleDefinition> discoverPythonModules() => _pythonModules;
                              ^
../../../../.pub-cache/git/dart_python_ffi-f6eb62d8e78fb883ae5f8fc1133c985306d28067/packages/python_ffi_interface/lib/src/delegate.dart:42:41: Context: This is the overridden method ('discoverPythonModules').
  FutureOr<Set<PythonModuleDefinition>> discoverPythonModules({
                                        ^
../../../../.pub-cache/hosted/pub.dev/python_ffi_cpython_dart-0.3.1/lib/src/object.dart:13:5: Error: The argument type 'void Function(invalid-type)' can't be assigned to the parameter type 'void Function(PythonFfiCPythonBase, Pointer<_object>)'.
 - 'PythonFfiCPythonBase' is from 'package:python_ffi_cpython_dart/python_ffi_cpython_dart.dart' ('../../../../.pub-cache/hosted/pub.dev/python_ffi_cpython_dart-0.3.1/lib/python_ffi_cpython_dart.dart').
 - 'Pointer' is from 'dart:ffi'.
 - '_object' is from 'package:python_ffi_cpython_dart/src/ffi/generated_bindings.g.dart' ('../../../../.pub-cache/hosted/pub.dev/python_ffi_cpython_dart-0.3.1/lib/src/ffi/generated_bindings.g.dart').
    _initializerCallback,
    ^
../../../../.pub-cache/hosted/pub.dev/python_ffi_cpython_dart-0.3.1/lib/src/object.dart:6:5: Error: 'Pair' isn't a type.
    Pair<PythonFfiCPythonBase, Pointer<PyObject>> value,
    ^^^^
../../../../.pub-cache/hosted/pub.dev/python_ffi_cpython_dart-0.3.1/lib/src/object.dart:17:5: Error: 'Pair' isn't a type.
    Pair<PythonFfiDelegate<Object?>, Object?> value,
    ^^^^
../../../../.pub-cache/hosted/pub.dev/python_ffi_cpython_dart-0.3.1/lib/src/object.dart:26:26: Error: 'Pair' isn't a type.
  static final Finalizer<Pair<PythonFfiDelegate<Object?>, Object?>> finalizer =
                         ^^^^
../../../../.pub-cache/hosted/pub.dev/python_ffi_cpython_dart-0.3.1/lib/src/object.dart:27:17: Error: 'Pair' isn't a type.
      Finalizer<Pair<PythonFfiDelegate<Object?>, Object?>>(
                ^^^^
../../../../.pub-cache/hosted/pub.dev/python_ffi_cpython_dart-0.3.1/lib/src/python_ffi_cpython_dart_base.dart:156:15: Error: 'Pair' isn't a type.
        final Pair<PythonSourceEntity, PythonSourceFileEntity?> result =
              ^^^^
../../../../.pub-cache/hosted/pub.dev/python_ffi_cpython_dart-0.3.1/lib/src/python_ffi_cpython_dart_base.dart:161:14: Error: Method not found: 'Pair'.
      return Pair<PythonSourceEntity, PythonSourceFileEntity?>(
             ^^^^
../../../../.pub-cache/hosted/pub.dev/python_ffi_cpython_dart-0.3.1/lib/src/python_ffi_cpython_dart_base.dart:166:14: Error: Method not found: 'Pair'.
      return Pair<PythonSourceEntity, PythonSourceFileEntity?>(
             ^^^^
../../../../.pub-cache/hosted/pub.dev/python_ffi_cpython_dart-0.3.1/lib/src/python_ffi_cpython_dart_base.dart:186:13: Error: 'Pair' isn't a type.
      final Pair<PythonSourceEntity, PythonSourceFileEntity?> result =
            ^^^^
../../../../.pub-cache/hosted/pub.dev/python_ffi_cpython_dart-0.3.1/lib/src/python_ffi_cpython_dart_base.dart:392:76: Error: Required named parameter 'package' must be provided.
    final Set<PythonModuleDefinition> modules = await discoverPythonModules();
                                                                           ^
../../../../.pub-cache/git/dart_python_ffi-f6eb62d8e78fb883ae5f8fc1133c985306d28067/packages/dartpip/lib/interface_gen/src/inspect/type_string.dart:62:32: Error: Undefined name 'BuiltinsModule'.
    final Object? typeObject = BuiltinsModule.import().type(second);
                               ^^^^^^^^^^^^^^
../../../../.pub-cache/git/dart_python_ffi-f6eb62d8e78fb883ae5f8fc1133c985306d28067/packages/dartpip/lib/interface_gen/src/inspect/type_string.dart:84:30: Error: Undefined name 'BuiltinsModule'.
  final Object? typeObject = BuiltinsModule.import().type(object);
                             ^^^^^^^^^^^^^^
Failed to build dartpip:dartpip:
../../../../.pub-cache/git/dart_python_ffi-f6eb62d8e78fb883ae5f8fc1133c985306d28067/packages/dartpip/lib/module_bundle/module_bundle.dart:119:30: Error: Member not found: 'PythonFfiCPythonDart.decodePythonSourceEntity'.
        PythonFfiCPythonDart.decodePythonSourceEntity(data);
                             ^^^^^^^^^^^^^^^^^^^^^^^^
../../../../.pub-cache/git/dart_python_ffi-f6eb62d8e78fb883ae5f8fc1133c985306d28067/packages/dartpip/lib/util.dart:93:59: Error: The getter 'stdlibDir' isn't defined for the class 'PythonFfiDart'.
 - 'PythonFfiDart' is from 'package:python_ffi_dart/python_ffi_dart.dart' ('../../../../.pub-cache/hosted/pub.dev/python_ffi_dart-0.3.1/lib/python_ffi_dart.dart').
Try correcting the name to the name of an existing getter, or defining a getter or field named 'stdlibDir'.
  final String stdlibPath = (await PythonFfiDart.instance.stdlibDir).path;
                                                          ^^^^^^^^^
../../../../.pub-cache/hosted/pub.dev/python_ffi_dart-0.3.1/lib/src/python_ffi_dart_base.dart:44:33: Error: Required named parameter 'package' must be provided.
      return delegate.initialize();
                                ^
../../../../.pub-cache/hosted/pub.dev/python_ffi_cpython_dart-0.3.1/lib/src/object.dart:6:5: Error: Type 'Pair' not found.
    Pair<PythonFfiCPythonBase, Pointer<PyObject>> value,
    ^^^^
../../../../.pub-cache/hosted/pub.dev/python_ffi_cpython_dart-0.3.1/lib/src/object.dart:17:5: Error: Type 'Pair' not found.
    Pair<PythonFfiDelegate<Object?>, Object?> value,
    ^^^^
../../../../.pub-cache/hosted/pub.dev/python_ffi_cpython_dart-0.3.1/lib/src/object.dart:26:26: Error: Type 'Pair' not found.
  static final Finalizer<Pair<PythonFfiDelegate<Object?>, Object?>> finalizer =
                         ^^^^
../../../../.pub-cache/hosted/pub.dev/python_ffi_cpython_dart-0.3.1/lib/src/python_ffi_cpython_dart_base.dart:139:10: Error: Type 'Pair' not found.
  static Pair<PythonSourceEntity, PythonSourceFileEntity?>
         ^^^^
../../../../.pub-cache/hosted/pub.dev/python_ffi_cpython_dart-0.3.1/lib/src/python_ffi_cpython_dart_base.dart:39:13: Error: The non-abstract class 'PythonFfiCPythonDart' is missing implementations for these members:
 - PythonFfiDelegate.stdlibDir
Try to either
 - provide an implementation,
 - inherit an implementation from a superclass or mixin,
 - mark the class as abstract, or
 - provide a 'noSuchMethod' implementation.

final class PythonFfiCPythonDart extends PythonFfiCPythonBase
            ^^^^^^^^^^^^^^^^^^^^
../../../../.pub-cache/git/dart_python_ffi-f6eb62d8e78fb883ae5f8fc1133c985306d28067/packages/python_ffi_interface/lib/src/delegate.dart:39:27: Context: 'PythonFfiDelegate.stdlibDir' is defined here.
  FutureOr<Directory> get stdlibDir;
                          ^^^^^^^^^
../../../../.pub-cache/hosted/pub.dev/python_ffi_cpython_dart-0.3.1/lib/src/python_ffi_cpython_dart_base.dart:311:16: Error: The method 'PythonFfiCPythonMixin.initialize' has fewer named arguments than those of overridden method 'PythonFfiDelegate.initialize'.
  Future<void> initialize() async {
               ^
../../../../.pub-cache/git/dart_python_ffi-f6eb62d8e78fb883ae5f8fc1133c985306d28067/packages/python_ffi_interface/lib/src/delegate.dart:32:18: Context: This is the overridden method ('initialize').
  FutureOr<void> initialize({required String? package}) async {
                 ^
../../../../.pub-cache/hosted/pub.dev/python_ffi_cpython_dart-0.3.1/lib/src/python_ffi_cpython_dart_base.dart:39:13: Error: Applying the mixin 'PythonFfiCPythonMixin' to 'PythonFfiCPythonBase' introduces an erroneous override of 'initialize'.
final class PythonFfiCPythonDart extends PythonFfiCPythonBase
            ^^^^^^^^^^^^^^^^^^^^
../../../../.pub-cache/hosted/pub.dev/python_ffi_cpython_dart-0.3.1/lib/src/python_ffi_cpython_dart_base.dart:311:16: Context: The method 'PythonFfiCPythonMixin.initialize' has fewer named arguments than those of overridden method 'PythonFfiDelegate.initialize'.
  Future<void> initialize() async {
               ^
../../../../.pub-cache/git/dart_python_ffi-f6eb62d8e78fb883ae5f8fc1133c985306d28067/packages/python_ffi_interface/lib/src/delegate.dart:32:18: Context: This is the overridden method ('initialize').
  FutureOr<void> initialize({required String? package}) async {
                 ^
../../../../.pub-cache/hosted/pub.dev/python_ffi_cpython_dart-0.3.1/lib/src/python_ffi_cpython_dart_base.dart:208:31: Error: The method 'PythonFfiCPythonDart.discoverPythonModules' has fewer named arguments than those of overridden method 'PythonFfiDelegate.discoverPythonModules'.
  Set<PythonModuleDefinition> discoverPythonModules() => _pythonModules;
                              ^
../../../../.pub-cache/git/dart_python_ffi-f6eb62d8e78fb883ae5f8fc1133c985306d28067/packages/python_ffi_interface/lib/src/delegate.dart:42:41: Context: This is the overridden method ('discoverPythonModules').
  FutureOr<Set<PythonModuleDefinition>> discoverPythonModules({
                                        ^
../../../../.pub-cache/hosted/pub.dev/python_ffi_cpython_dart-0.3.1/lib/src/object.dart:13:5: Error: The argument type 'void Function(invalid-type)' can't be assigned to the parameter type 'void Function(PythonFfiCPythonBase, Pointer<_object>)'.
 - 'PythonFfiCPythonBase' is from 'package:python_ffi_cpython_dart/python_ffi_cpython_dart.dart' ('../../../../.pub-cache/hosted/pub.dev/python_ffi_cpython_dart-0.3.1/lib/python_ffi_cpython_dart.dart').
 - 'Pointer' is from 'dart:ffi'.
 - '_object' is from 'package:python_ffi_cpython_dart/src/ffi/generated_bindings.g.dart' ('../../../../.pub-cache/hosted/pub.dev/python_ffi_cpython_dart-0.3.1/lib/src/ffi/generated_bindings.g.dart').
    _initializerCallback,
    ^
../../../../.pub-cache/hosted/pub.dev/python_ffi_cpython_dart-0.3.1/lib/src/object.dart:6:5: Error: 'Pair' isn't a type.
    Pair<PythonFfiCPythonBase, Pointer<PyObject>> value,
    ^^^^
../../../../.pub-cache/hosted/pub.dev/python_ffi_cpython_dart-0.3.1/lib/src/object.dart:17:5: Error: 'Pair' isn't a type.
    Pair<PythonFfiDelegate<Object?>, Object?> value,
    ^^^^
../../../../.pub-cache/hosted/pub.dev/python_ffi_cpython_dart-0.3.1/lib/src/object.dart:26:26: Error: 'Pair' isn't a type.
  static final Finalizer<Pair<PythonFfiDelegate<Object?>, Object?>> finalizer =
                         ^^^^
../../../../.pub-cache/hosted/pub.dev/python_ffi_cpython_dart-0.3.1/lib/src/object.dart:27:17: Error: 'Pair' isn't a type.
      Finalizer<Pair<PythonFfiDelegate<Object?>, Object?>>(
                ^^^^
../../../../.pub-cache/hosted/pub.dev/python_ffi_cpython_dart-0.3.1/lib/src/python_ffi_cpython_dart_base.dart:156:15: Error: 'Pair' isn't a type.
        final Pair<PythonSourceEntity, PythonSourceFileEntity?> result =
              ^^^^
../../../../.pub-cache/hosted/pub.dev/python_ffi_cpython_dart-0.3.1/lib/src/python_ffi_cpython_dart_base.dart:161:14: Error: Method not found: 'Pair'.
      return Pair<PythonSourceEntity, PythonSourceFileEntity?>(
             ^^^^
../../../../.pub-cache/hosted/pub.dev/python_ffi_cpython_dart-0.3.1/lib/src/python_ffi_cpython_dart_base.dart:166:14: Error: Method not found: 'Pair'.
      return Pair<PythonSourceEntity, PythonSourceFileEntity?>(
             ^^^^
../../../../.pub-cache/hosted/pub.dev/python_ffi_cpython_dart-0.3.1/lib/src/python_ffi_cpython_dart_base.dart:186:13: Error: 'Pair' isn't a type.
      final Pair<PythonSourceEntity, PythonSourceFileEntity?> result =
            ^^^^
../../../../.pub-cache/hosted/pub.dev/python_ffi_cpython_dart-0.3.1/lib/src/python_ffi_cpython_dart_base.dart:392:76: Error: Required named parameter 'package' must be provided.
    final Set<PythonModuleDefinition> modules = await discoverPythonModules();
                                                                           ^
../../../../.pub-cache/git/dart_python_ffi-f6eb62d8e78fb883ae5f8fc1133c985306d28067/packages/dartpip/lib/interface_gen/src/inspect/type_string.dart:62:32: Error: Undefined name 'BuiltinsModule'.
    final Object? typeObject = BuiltinsModule.import().type(second);
                               ^^^^^^^^^^^^^^
../../../../.pub-cache/git/dart_python_ffi-f6eb62d8e78fb883ae5f8fc1133c985306d28067/packages/dartpip/lib/interface_gen/src/inspect/type_string.dart:84:30: Error: Undefined name 'BuiltinsModule'.
  final Object? typeObject = BuiltinsModule.import().type(object);

I've created a branch in my repository, in case you want to take a closer look.

[IVLIVS-III]

Seems like you are missing python_ffi_dart and python_ffi_cpython_dart in the dependency overrides.

Most of the implementation is shared between the <package> and <package>_dart variants.
In fact, unlike the naming might suggest, the <package> variant builds on top of the <package>_dart variant containing most of the implementation.

So could you also add the <package>_dart variants mentioned on top to your dependency overrides and try again?