Adding source code files for Chapter 10
This commit is contained in:
muassif
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#app1.py: routing in a Flask application
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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():
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return 'Hello World!'
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@app.route('/greeting')
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def greeting():
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return 'Greetings from Flask web app!'
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@app.route('/hello/<name>')
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def hello_user(name):
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return f'Hello {name}!'
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if __name__ == '__main__':
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app.run()
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#app2.py: map request with method type
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from flask import Flask, request
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app = Flask(__name__)
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@app.route('/submit', methods=['GET'])
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def req_with_get():
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return "Received a get request"
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@app.post('/submit')
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def req_with_post():
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return "Received a post request"
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@app.route('/submit2', methods = ['GET', 'POST'])
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def both_get_post():
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if request.method == 'POST':
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return "Received a post request 2"
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else:
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return "Received a get request 2"
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if __name__ == '__main__':
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app.run()
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#app3.py: rendering static and dynamic contents
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from flask import Flask, render_template, url_for, redirect
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app = Flask(__name__)
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@app.route('/hello')
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def hello():
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hello_url = url_for ('static', filename='app3.html')
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return redirect(hello_url)
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@app.route('/greeting')
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def greeting():
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msg = "Hello from Python"
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return render_template('app3.html', greeting=msg)
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if __name__ == '__main__':
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app.run()
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#app4.py: extracting parameters from different requests
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from flask import Flask, request, render_template
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app = Flask(__name__)
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@app.route('/hello')
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@app.route('/hello/<fname> <lname>')
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def hello_user(fname=None, lname=None):
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return render_template('app4.html', name=f"{fname} {lname}")
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@app.get('/submit')
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def process_get_request_data():
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fname = request.args['fname']
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lname = request.args.get('lname', '')
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return render_template('app4.html', name=f"{fname} {lname}")
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@app.post('/submit')
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def process_post_request_data():
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fname = request.form['fname']
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lname = request.form.get('lname','')
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#lname = request.form['lname']
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return render_template('app4.html', name=f"{fname} {lname}")
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if __name__ == '__main__':
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app.run()
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#app5.py: interacting with db for create, delete and list objects
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from flask import Flask, request, render_template, redirect
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from flask_sqlalchemy import SQLAlchemy
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from werkzeug.exceptions import HTTPException
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import json
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app = Flask(__name__)
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app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///student.db'
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app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
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db = SQLAlchemy(app)
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class Student(db.Model):
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id = db.Column(db.Integer, primary_key=True)
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name = db.Column(db.String(80), nullable=False)
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grade = db.Column(db.String(20), nullable=True)
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def __repr__(self):
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return '<Student %r>' % self.name
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@app.get('/list')
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def list_students():
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student_list = Student.query.all()
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return render_template('app5.html', students=student_list)
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@app.get('/add')
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def add_student():
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fname = request.args['fname']
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lname = request.args.get('lname', '')
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grade = request.args.get('grade','')
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student = Student(name=f"{fname} {lname}", grade=grade)
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db.session.add(student)
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db.session.commit()
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return redirect("/list")
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@app.get('/delete/<int:id>')
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def del_student(id):
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todelete = Student.query.filter_by(id=id).first()
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db.session.delete(todelete)
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db.session.commit()
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return redirect("/list")
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@app.errorhandler(HTTPException)
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def page_not_found(error):
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print(error)
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response = error.get_response()
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# replace the body with JSON
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response.data = json.dumps({
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"code": error.code,
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"name": error.name,
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"description": error.description,
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})
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return response
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if __name__ == '__main__':
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app.run()
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#app6.py: error and exception handling
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import json
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from flask import Flask, render_template, abort
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from werkzeug.exceptions import HTTPException
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app = Flask(__name__)
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@app.get('/')
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def hello():
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return 'Hello World!'
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@app.route('/greeting')
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def greeting():
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x = 10/0
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return 'Greetings from Flask web app!'
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@app.errorhandler(404)
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def page_not_found(error):
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return render_template('error404.html'), 404
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@app.errorhandler(500)
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def internal_error(error):
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return render_template('error500.html'), 500
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@app.errorhandler(HTTPException)
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def generic_handler(error):
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error_detail = json.dumps({
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"code": error.code,
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"name": error.name,
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"description": error.description,
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})
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return render_template('error.html', err_msg=error_detail), error.code
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if __name__ == '__main__':
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app.run()
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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>Hello</title>
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</head>
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<body>
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<h1> Hello World from a static file </h1>
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</body>
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</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>Dynamic contents demo</title>
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</head>
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<body>
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{% if greeting %}
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<h1> {{ greeting }}!</h1>
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{% endif %}
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</body>
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</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>Dynamic contents demo</title>
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</head>
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<body>
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{% if name %}
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<h1>Hello {{ name }}!</h1>
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{% else %}
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<h1>Hello, whoever you are!</h1>
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{% endif %}
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</body>
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</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>Students from database</title>
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</head>
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<body>
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<h2>Students</h2>
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{% if students|length > 0 %}
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<table>
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<thead>
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<tr>
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<th scope="col">SNo</th>
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<th scope="col">name</th>
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<th scope="col">grade</th>
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</tr>
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</thead>
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<tbody>
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{% for student in students %}
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<tr>
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<td scope="row">{{student.id}}</td>
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<td>{{student.name}}</td>
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<td>{{student.grade}}</td>
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</tr>
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{% endfor %}
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</tbody>
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</table>
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{% endif %}
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</body>
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</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>Error page</title>
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</head>
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<body>
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<h3>{{ err_msg }}</h3>
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</body>
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</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>Error page</title>
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</head>
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<body>
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<h3>The page you request does not exist. Please check your URL.</h3>
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</body>
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</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>Error page</title>
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</head>
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<body>
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<h3>There is an internal server problem. Please try again later.</h3>
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</body>
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</html>
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