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![FORMS.PY
from flask_wtf import Form
from wtforms import StringField, SubmitField, validators
class GreetingsForm(Form):
name = StringField(label="Enter your name: ",
validators=[validators.DataRequired()])
submit = SubmitField("Greet!")](https://image.slidesharecdn.com/nettepivoflaskpdf-160213005516/85/Python-Flask-miniapp-ignite-15-320.jpg)
![APP.PY
from flask import (Flask, render_template,
request, flash, redirect, url_for)
from forms import GreetingsForm
app = Flask(__name__)
@app.route('/hello-form', methods=["GET", "POST"])
def hello_form():
form = GreetingsForm(request.form)
if form.validate_on_submit():
flash("Hello" + form.name.data)
return redirect(url_for("hello_form"))
return render_template("hello-form.html", form=form)](https://image.slidesharecdn.com/nettepivoflaskpdf-160213005516/85/Python-Flask-miniapp-ignite-16-320.jpg)
Uploaded byMichal Haták
Python - Flask - miniapp - ignite
The document serves as an introduction to Flask, a Python web framework, contrasting it with PHP by highlighting differences such as significant whitespace and a rich library ecosystem. It outlines how to set up a basic web application with Flask, including creating a virtual environment, installing packages using pip, and building interactive web forms. Example code snippets illustrate how to create routes and templates for dynamic web content.
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Python - Flask - miniapp - ignite
- 1. FLASK - ÚVODDO PYTHONU MICHAL HATÁK
- 2. INTRO DIFFERENCES BETWEEN PHPAND PYTHON ▸ whitespace significant ▸ library for everything ▸ full language (not only websites) ▸ module system
- 3. INTRO PACKAGE SYSTEM ▸ PIP- very similar to composer ▸ pip install <package name> ▸ pip install -f <requirements.txt>
- 4. INTRO VIRTUAL ENVIRONMENTS ▸ isolatedpython environment ▸ contains python executables > multiple python version on one system
- 5. INTRO THE GOAL ▸ basicweb app using Flask framework (very similar to Nette) ▸ little showcase
- 6. PREPARE PROJECT FIRST STEPS ▸create virualenv $ virtualenv venv $ . venv/bin/activate ▸ install Flask framework $ pip install Flask
- 7.
- 8. APP.PY from flask importFlask app = Flask(__name__) @app.route('/') def hello_world(): return 'Hello World!' if __name__ == '__main__': app.debug = True app.run() # default 127.0.0.1:5000
- 9.
- 10. APP.PY from flask importFlask, render_template app = Flask(__name__) @app.route('/hello/<name>') def hello(name): return render_template("hello.html", name=name) if __name__ == '__main__': app.debug = True app.run() # default 127.0.0.1:5000
- 11. TEMPLATES/HELLO.HTML <!DOCTYPE html> <html lang="en"> <head> <title>MyFirst Website</title> </head> <body> Hello <strong>{{ name }}</strong> Hello <strong>{{ name | reverse }}</strong> {{ "%s - %s" | format("Hello", name) }} </body> </html>
- 12.
- 13. INSTALL ▸ $ pipinstall wtforms flask-wtf
- 14. TEMPLATES/LAYOUT.HTML <!DOCTYPE html> <html lang="en"> <head> <title>MyFirst Website</title> </head> <body> {% with messages = get_flashed_messages() %} {% if messages %} <ul class=flashes> {% for message in messages %} <li>{{ message }}</li> {% endfor %} </ul> {% endif %} {% endwith %} {% block body %}{% endblock %} </body> </html>
- 15. FORMS.PY from flask_wtf importForm from wtforms import StringField, SubmitField, validators class GreetingsForm(Form): name = StringField(label="Enter your name: ", validators=[validators.DataRequired()]) submit = SubmitField("Greet!")
- 16. APP.PY from flask import(Flask, render_template, request, flash, redirect, url_for) from forms import GreetingsForm app = Flask(__name__) @app.route('/hello-form', methods=["GET", "POST"]) def hello_form(): form = GreetingsForm(request.form) if form.validate_on_submit(): flash("Hello" + form.name.data) return redirect(url_for("hello_form")) return render_template("hello-form.html", form=form)
- 17. TEMPLATES/HELLO-FORM.HTML {% extends "layout.html"%} {% block body %} <form method="post" action="{{ url_for("hello_form") }}"> {{ form.hidden_tag() }} <label>{{ form.name.label.text }}</label> {{ form.name() }} {{ form.submit() }} </form> {% endblock %}