Init

.gitignore

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+
+# Created by https://www.toptal.com/developers/gitignore/api/python
+# Edit at https://www.toptal.com/developers/gitignore?templates=python
+
+### Python ###
+# 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/
+pip-wheel-metadata/
+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/
+pytestdebug.log
+
+# 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/
+doc/_build/
+
+# PyBuilder
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+.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/
+
+# End of https://www.toptal.com/developers/gitignore/api/python
+
+# keep the bot token out of git lol
+token.env

Dockerfile

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+FROM python:3
+
+WORKDIR /usr/src/app
+
+COPY requirements.txt ./
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY main.py .
+
+CMD [ "python", "-u", "./main.py" ]

docker-compose.yml

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+version: "3"
+
+services:
+  bot:
+    build: .
+    env_file:
+      - ./token.env

main.py

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+import os
+import random
+import difflib
+
+import telegram
+from telegram import Update
+from telegram.ext import Updater, MessageHandler, Filters, CallbackContext
+
+POSSIBLE_TEXTS = [
+    "\U0001F92C",  # "serious face with symbols covering mouth"
+]
+
+
+def on_message(update: Update, context: CallbackContext):
+    for word in update.message.text.split():
+        if difflib.get_close_matches(word.lower(), ["blockflöte"]):
+            context.bot.send_message(
+                chat_id=update.effective_chat.id, text=random.choice(POSSIBLE_TEXTS)
+            )
+            break
+
+
+message_handler = MessageHandler(Filters.text & ~Filters.command, on_message)
+
+if __name__ == "__main__":
+    TOKEN = os.environ.get("TOKEN")
+
+    if not TOKEN:
+        print("Please provide a bot token using the TOKEN environment variable")
+        exit(1)
+
+    try:
+        updater = Updater(token=TOKEN, use_context=True)
+    except telegram.error.InvalidToken:
+        print("The provided token appears to be invalid")
+        exit(1)
+
+    dispatcher = updater.dispatcher
+
+    dispatcher.add_handler(message_handler)
+
+    updater.start_polling()

requirements.txt

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+python-telegram-bot==12.8