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Add open lesson Flask intro 23.05.2022
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‎README.md‎

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- [Быстрая разработка JSON API приложений на Flask (день 2) от 20.08.2021](open-lessons/flask-jsonapi.20.08.2021/)
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- [Декораторы в Python от 15.02.2022](open-lessons/decorators.15.02.2022/)
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- [Функции-помощники: map, filter, reduce от 21.02.2022](open-lessons/helper-funcs.21.02.2022/)
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- [Знакомство с веб-разработкой на Flask от 23.05.2022](open-lessons/flask.23.05.2022/)
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### Курсы Python Basic:

‎open-lessons/flask.23.05.2022/main.py‎

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from flask import Flask, request
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from views.products import products_app
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app = Flask(__name__)
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app.config.update(ENV="development")
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app.register_blueprint(
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products_app,
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url_prefix="/products",
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)
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@app.route("/")
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def hello_world():
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# another_func()
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return "<p>Hello, World!!</p>"
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def another_func():
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print(request)
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print(request.path)
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@app.route("/hello/")
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def hello_view():
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# another_func()
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name = request.args.get("name", "World")
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name = name.strip()
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if not name:
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name = "World"
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return {"message": f"Hello {name}!"}
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@app.route("/items/<int:item_id>/")
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def get_item(item_id: int):
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return {"item_id": item_id}
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@app.route("/items/<string:item_id>/")
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def get_item_str(item_id: str):
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return {"item": {"id": item_id.lower()}}
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if __name__ == '__main__':
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app.run(debug=True)

‎open-lessons/flask.23.05.2022/requirements.txt‎

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click==8.1.3
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Flask==2.1.2
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itsdangerous==2.1.2
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Jinja2==3.1.2
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MarkupSafe==2.1.1
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Werkzeug==2.1.2

‎open-lessons/flask.23.05.2022/templates/base.html‎

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<title>
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{% block title %}
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Base Title
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{% endblock %}
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</title>
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</head>
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<body>
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{% block body %}
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Base Body
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{# <small>#}
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{# {% block small %}#}
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{# small text#}
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{# {% endblock %}#}
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{# </small>#}
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{% endblock %}
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</body>
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<footer>
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<small>
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OTUS &copy; 2022
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</small>
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</footer>
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</html>

‎open-lessons/flask.23.05.2022/templates/products/add.html‎

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{% extends 'base.html' %}
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{% block body %}
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<div>
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<form method="post">
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<label for="id-name">Product name:</label>
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<input type="text" id="id-name" name="product-name" required>
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<button type="submit">Create</button>
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</form>
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</div>
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{% endblock %}
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{% block title %}
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Add product
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{% endblock %}

‎open-lessons/flask.23.05.2022/templates/products/details.html‎

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{% extends 'base.html' %}
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{% block title %}
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Product #{{ product_id }}
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{% endblock %}
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{% block body %}
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<h1>Product {{ product_name }}</h1>
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<div>
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<a href="{{ url_for('products_app.list') }}">
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Back to products list
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</a>
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</div>
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{% endblock %}

‎open-lessons/flask.23.05.2022/templates/products/list.html‎

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{% extends 'base.html' %}
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{% block title %}
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Products List
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{% endblock %}
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{% block body %}
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<h1>Products list:</h1>
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<div>
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<ul>
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{% for product_id, product_name in products %}
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<li>
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<a href="{{ url_for('products_app.details', product_id=product_id) }}">
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{{ product_name }}
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</a>
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</li>
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{% endfor %}
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</ul>
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</div>
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<div>
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<a href="{{ url_for('products_app.add') }}">
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Create product</a>
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</div>
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{% endblock %}
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{#{% block small %}#}
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{#some products#}
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{#{% endblock %}#}

‎open-lessons/flask.23.05.2022/views/__init__.py‎

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‎open-lessons/flask.23.05.2022/views/products.py‎

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from flask import (
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Blueprint,
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render_template,
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request,
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redirect,
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url_for,
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)
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from werkzeug.exceptions import BadRequest, NotFound
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products_app = Blueprint("products_app", __name__)
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PRODUCTS = {
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1: "Laptop",
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2: "Desktop",
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3: "Smartphone",
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}
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@products_app.route("/", endpoint="list")
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def products_list():
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return render_template(
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"products/list.html",
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products=list(PRODUCTS.items()),
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)
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@products_app.route("/<int:product_id>/", endpoint="details")
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def get_product(product_id: int):
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product_name = PRODUCTS.get(product_id)
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if product_name is None:
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raise NotFound(f"product #{product_id} doesn't exist!")
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return render_template(
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"products/details.html",
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product_id=product_id,
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product_name=product_name,
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)
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@products_app.route("/add/", methods=["GET", "POST"], endpoint="add")
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def add_product():
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if request.method == "GET":
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return render_template("products/add.html")
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# if request.method == "POST":
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# pass
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product_name = request.form.get("product-name")
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if not product_name:
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raise BadRequest("Field `product-name` required!")
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product_id = len(PRODUCTS) + 1
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PRODUCTS[product_id] = product_name
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url = url_for("products_app.details", product_id=product_id)
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return redirect(url)

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