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FalkLiebezeitFalkLiebezeit
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‎11.Web/Flask/hallo_falk/app.py‎

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from flask import Flask, render_template
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app = Flask(__name__)
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@app.route("/")
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def home():
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return render_template("index.html")
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if __name__ == "__main__":
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app.run(debug=True)

‎11.Web/Flask/hallo_falk/templates/index.html‎

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<!DOCTYPE html>
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<html lang="de">
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<head>
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<meta charset="UTF-8">
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<title>Mein erstes Flask-Projekt</title>
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</head>
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<body>
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<h1>Hallo Falk 👋, willkommen bei Flask!</h1>
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</body>
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</html>

11.Web/helloWorld.py renamed to 11.Web/Flask/helloWorld.py

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‎11.Web/Flask/hello_world/app.py‎

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from flask import Flask
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app = Flask(__name__)
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@app.route("/")
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def hello_world():
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return "<p>Hello, World!</p>"
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if __name__ == "__main__":
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app.run(debug=True)

‎11.Web/Flask/simple_flask_apps/HelloWorld.py‎

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#!/usr/bin/env python3
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"""
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Simple Flask example app.
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Optimized and commented version of the original `HelloWorld.py`.
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Provides an application factory (`create_app`) for easier testing and
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reads host/port/debug configuration from environment variables.
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"""
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from __future__ import annotations
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import os
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from typing import Optional
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from flask import Flask
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def create_app(debug: bool = False) -> Flask:
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"""
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Application factory. Returns a configured Flask application.
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Args:
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debug: Whether to enable Flask debug mode.
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Returns:
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A configured `Flask` instance with routes registered.
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"""
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app = Flask(__name__)
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app.debug = debug
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@app.route("/")
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def hello() -> str:
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"""Return a friendly greeting for the root path.
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Kept intentionally simple for demonstration and tests.
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"""
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return "Hello, World!"
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return app
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# Module-level app useful for WSGI servers (e.g., gunicorn) or imports.
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app: Flask = create_app()
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def _env_bool(name: str, default: bool = False) -> bool:
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"""Read an environment variable and interpret common truthy values.
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Accepts: '1', 'true', 'yes', 'on' (case-insensitive) as True.
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"""
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val = os.getenv(name)
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if val is None:
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return default
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return val.lower() in ("1", "true", "yes", "on")
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if __name__ == "__main__":
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# Configuration from environment variables with safe defaults.
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host = os.environ.get("FLASK_RUN_HOST", "127.0.0.1")
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port = int(os.environ.get("PORT", "5000"))
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debug = _env_bool("FLASK_DEBUG", False)
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# Create the app with the chosen debug setting and run it.
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app = create_app(debug=debug)
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app.run(host=host, port=port, debug=debug)

‎11.Web/Flask/simple_flask_apps/app.py‎

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#!/usr/bin/env python3
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"""
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Minimal Flask application.
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This file provides a small, documented and test-friendly Flask app.
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It uses an application factory (`create_app`) and reads runtime
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configuration from environment variables to avoid hardcoding debug
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settings in the `__main__` block.
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"""
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from __future__ import annotations
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import os
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from flask import Flask
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def create_app(debug: bool = False) -> Flask:
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"""
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Create and configure a Flask application.
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Args:
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debug: Whether to enable Flask debug mode for development.
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Returns:
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Configured `Flask` application instance.
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"""
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app = Flask(__name__)
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app.debug = debug
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@app.route("/")
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def hello() -> str:
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"""Return a friendly German greeting for the root path."""
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return "Hallo von Flask!"
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return app
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# Module-level application (useful for WSGI servers or imports)
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app: Flask = create_app()
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def _env_bool(name: str, default: bool = False) -> bool:
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"""Interpret common truthy environment variable values as boolean.
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Recognised truthy values: '1', 'true', 'yes', 'on' (case-insensitive).
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"""
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val = os.getenv(name)
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if val is None:
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return default
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return val.lower() in ("1", "true", "yes", "on")
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if __name__ == "__main__":
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host = os.environ.get("FLASK_RUN_HOST", "127.0.0.1")
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port = int(os.environ.get("PORT", "5000"))
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debug = _env_bool("FLASK_DEBUG", False)
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app = create_app(debug=debug)
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app.run(host=host, port=port, debug=debug)

‎11.Web/Flask/simple_flask_apps/current_datetime.py‎

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#!/usr/bin/env python3
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"""
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Print the current local date and time.
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This script prints a compact ISO-like timestamp and a human-friendly
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timestamp including time zone information.
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"""
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from datetime import datetime
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def main() -> None:
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"""Get current local time and print two readable formats."""
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now = datetime.now().astimezone()
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# ISO-like format (date and time) with seconds precision
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iso_like = now.isoformat(sep=" ", timespec="seconds")
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# Human-friendly format, includes timezone name and offset when available
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human = now.strftime("%Y-%m-%d %H:%M:%S %Z%z")
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print(iso_like)
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print(human)
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if __name__ == "__main__":
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main()

‎11.Web/Flask/simple_flask_apps/datetime_app.py‎

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#!/usr/bin/env python3
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"""
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A small Flask app that displays the current local date and time.
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Provides an application factory `create_app()` for easy testing and WSGI
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integration. The root route `/` renders a simple template showing the
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current timestamp.
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"""
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from __future__ import annotations
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import os
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from datetime import datetime
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from flask import Flask, render_template, jsonify
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def create_app(debug: bool = False) -> Flask:
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"""Create and configure the Flask application.
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Args:
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debug: Enable Flask debug mode when True.
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Returns:
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Configured Flask app instance.
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"""
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app = Flask(__name__, template_folder="templates")
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app.debug = debug
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@app.route("/")
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def index() -> str:
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"""Render the index template with the current datetime."""
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now = datetime.now().astimezone()
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# ISO-like compact timestamp and human-friendly format
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iso_ts = now.isoformat(sep=" ", timespec="seconds")
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human_ts = now.strftime("%Y-%m-%d %H:%M:%S %Z%z")
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return render_template("index.html", iso=iso_ts, human=human_ts)
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@app.route('/api/time')
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def api_time():
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"""Return the current datetime as JSON (iso and human-readable).
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This endpoint is polled by the client every second to update the
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displayed time without reloading the page.
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"""
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now = datetime.now().astimezone()
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iso_ts = now.isoformat(sep=" ", timespec="seconds")
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human_ts = now.strftime("%Y-%m-%d %H:%M:%S %Z%z")
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return jsonify({"iso": iso_ts, "human": human_ts})
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return app
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# Module-level app for WSGI servers / convenience imports
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app: Flask = create_app()
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def _env_bool(name: str, default: bool = False) -> bool:
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val = os.getenv(name)
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if val is None:
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return default
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return val.lower() in ("1", "true", "yes", "on")
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if __name__ == "__main__":
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host = os.environ.get("FLASK_RUN_HOST", "127.0.0.1")
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port = int(os.environ.get("PORT", "5000"))
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debug = _env_bool("FLASK_DEBUG", False)
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app = create_app(debug=debug)
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app.run(host=host, port=port, debug=debug)

‎11.Web/Flask/simple_flask_apps/meine_flask_app.code-workspace‎

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{
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"folders": [
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{
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"path": "."
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}
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],
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"settings": {
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"python-envs.pythonProjects": [
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{
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"path": "app.py",
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"envManager": "ms-python.python:venv",
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"packageManager": "ms-python.python:pip"
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},
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{
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"path": "current_datetime.py",
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"envManager": "ms-python.python:venv",
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"packageManager": "ms-python.python:pip"
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},
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{
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"path": "HelloWorld.py",
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"envManager": "ms-python.python:venv",
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"packageManager": "ms-python.python:pip"
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}
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]
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}
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}

‎11.Web/Flask/simple_flask_apps/requirements.txt‎

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Flask>=2.0

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