add skeleton

.gitignore

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+### VisualStudioCode template
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
+*.code-workspace
+
+# Local History for Visual Studio Code
+.history/
+
+### JetBrains template
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio, WebStorm and Rider
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff
+.idea/**/workspace.xml
+.idea/**/tasks.xml
+.idea/**/usage.statistics.xml
+.idea/**/dictionaries
+.idea/**/shelf
+
+# Generated files
+.idea/**/contentModel.xml
+
+# Sensitive or high-churn files
+.idea/**/dataSources/
+.idea/**/dataSources.ids
+.idea/**/dataSources.local.xml
+.idea/**/sqlDataSources.xml
+.idea/**/dynamic.xml
+.idea/**/uiDesigner.xml
+.idea/**/dbnavigator.xml
+
+# Gradle
+.idea/**/gradle.xml
+.idea/**/libraries
+
+# Gradle and Maven with auto-import
+# When using Gradle or Maven with auto-import, you should exclude module files,
+# since they will be recreated, and may cause churn.  Uncomment if using
+# auto-import.
+# .idea/artifacts
+# .idea/compiler.xml
+# .idea/jarRepositories.xml
+# .idea/modules.xml
+# .idea/*.iml
+# .idea/modules
+# *.iml
+# *.ipr
+
+# CMake
+cmake-build-*/
+
+# Mongo Explorer plugin
+.idea/**/mongoSettings.xml
+
+# File-based project format
+*.iws
+
+# IntelliJ
+out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Cursive Clojure plugin
+.idea/replstate.xml
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties
+
+# Editor-based Rest Client
+.idea/httpRequests
+
+# Android studio 3.1+ serialized cache file
+.idea/caches/build_file_checksums.ser
+
+### Python template
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+cover/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+.pybuilder/
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+#   For a library or package, you might want to ignore these files since the code is
+#   intended to run in multiple environments; otherwise, check them in:
+# .python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# pytype static type analyzer
+.pytype/
+
+# Cython debug symbols
+cython_debug/
+

__main__.py

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+# pip install dependency-injector
+# https://python-dependency-injector.ets-labs.org/index.html
+from dependency_injector.wiring import Provide, inject
+
+from containers import Container
+from services import BusinessLogic
+
+
+@inject
+def main(business: BusinessLogic = Provide(Container.business_logic)) -> None:
+    business.send("me")
+
+
+if __name__ == '__main__':
+    container = Container()
+    container.init_resources()
+    container.wire(modules=[__name__])
+
+    main()

containers.py

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+from dependency_injector import containers, providers
+
+import services
+
+
+class Container(containers.DeclarativeContainer):
+    email_service = providers.Factory(
+        services.EmailService
+    )
+
+    invoice_service = providers.Factory(
+        services.InvoiceService
+    )
+
+    business_logic = providers.Factory(
+        services.BusinessLogic,
+        invoice=invoice_service,
+        email=email_service
+    )

requirements.txt

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+dependency-injector==4.40.0
+mock==4.0.3
+pytest==7.1.3

services.py

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+class InvoiceService:
+    def create_invoice(self) -> str:
+        return "invoice created by service"
+
+
+class EmailService:
+    def send(self, receiver, invoice) -> None:
+        print(f'e-mail service is sending "{invoice}" to "{receiver}"')
+
+
+class BusinessLogic:
+    def __init__(self, invoice: InvoiceService, email: EmailService) -> None:
+        self.email_service = email
+        self.invoice_service = invoice
+
+    def send(self, email_address) -> None:
+        print('create invoice')
+        invoice = self.invoice_service.create_invoice()
+        print(f'sending invoice "{invoice}" to "{email_address}"')
+        self.email_service.send(email_address, invoice)
+        print('wat fott is is fott')

tests.py

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+from unittest import mock
+
+import services
+from containers import Container
+from dependency_injector.wiring import Provide, inject
+
+
+@inject
+def run(service: services.BusinessLogic = Provide[Container.business_logic]):
+    service.send("test@receiver")
+
+
+def test_is_mail_send():
+    container = Container()
+    container.init_resources()
+    container.wire(modules=[__name__])
+
+    email_service = mock.Mock(services.EmailService)
+    invoice_service = mock.Mock(services.InvoiceService)
+
+    invoice_service.create_invoice.return_value = "test invoice"
+
+    with container.override_providers(
+            email_service=email_service,
+            invoice_service=invoice_service):
+        run()
+
+    email_service.send.assert_called_once_with("test@receiver", "test invoice")
+    invoice_service.create_invoice.assert_called()