ch09

promila3 · Jun 15, 2019 · db3a51a · db3a51a
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diff --git a/ch09/1st_flask_app_1/app.py b/ch09/1st_flask_app_1/app.py
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+from flask import Flask, render_template
+
+app = Flask(__name__)
+
+@app.route('/')
+def index():
+    return render_template('first_app.html')
+
+if __name__ == '__main__':
+    app.run(debug=True)
diff --git a/ch09/1st_flask_app_1/templates/first_app.html b/ch09/1st_flask_app_1/templates/first_app.html
@@ -0,0 +1,13 @@
+<!doctype html>
+<html>
+  <head>
+    <title>First app</title>
+  </head>
+  <body>
+
+  <div>
+	Hi, this is my first Flask web app!
+  </div>
+
+  </body>
+</html>
diff --git a/ch09/1st_flask_app_2/app.py b/ch09/1st_flask_app_2/app.py
@@ -0,0 +1,23 @@
+from flask import Flask, render_template, request
+from wtforms import Form, TextAreaField, validators
+
+app = Flask(__name__)
+
+class HelloForm(Form):
+    sayhello = TextAreaField('',[validators.DataRequired()])
+
+@app.route('/')
+def index():
+    form = HelloForm(request.form)
+    return render_template('first_app.html', form=form)
+
+@app.route('/hello', methods=['POST'])
+def hello():
+    form = HelloForm(request.form)
+    if request.method == 'POST' and form.validate():
+        name = request.form['sayhello']
+        return render_template('hello.html', name=name)
+    return render_template('first_app.html', form=form)
+
+if __name__ == '__main__':
+    app.run(debug=True)
diff --git a/ch09/1st_flask_app_2/static/style.css b/ch09/1st_flask_app_2/static/style.css
@@ -0,0 +1,3 @@
+body {
+	font-size: 2em;
+}
diff --git a/ch09/1st_flask_app_2/templates/_formhelpers.html b/ch09/1st_flask_app_2/templates/_formhelpers.html
@@ -0,0 +1,13 @@
+{% macro render_field(field) %}
+  <dt>{{ field.label }}
+  <dd>{{ field(**kwargs)|safe }}
+  {% if field.errors %}
+    <ul class=errors>
+    {% for error in field.errors %}
+      <li>{{ error }}</li>
+    {% endfor %}
+    </ul>
+  {% endif %}
+  </dd>
+  </dt>
+{% endmacro %}
diff --git a/ch09/1st_flask_app_2/templates/first_app.html b/ch09/1st_flask_app_2/templates/first_app.html
@@ -0,0 +1,23 @@
+<!doctype html>
+<html>
+  <head>
+    <title>First app</title>
+	<link rel="stylesheet" href="{{ url_for('static', filename='style.css') }}">
+  </head>
+  <body>
+
+{% from "_formhelpers.html" import render_field %}
+
+<div>What's your name?</div>
+<form method=post action="/hello">
+
+  <dl>
+	  {{ render_field(form.sayhello) }}
+  </dl>
+
+  <input type=submit value='Say Hello' name='submit_btn'>
+
+</form>
+
+  </body>
+</html>
diff --git a/ch09/1st_flask_app_2/templates/hello.html b/ch09/1st_flask_app_2/templates/hello.html
@@ -0,0 +1,13 @@
+<!doctype html>
+<html>
+  <head>
+    <title>First app</title>
+	<link rel="stylesheet" href="{{ url_for('static', filename='style.css') }}">
+  </head>
+  <body>
+
+<div>Hello {{ name }}</div>
+
+
+  </body>
+</html>
diff --git a/ch09/README.md b/ch09/README.md
@@ -0,0 +1,41 @@
+Sebastian Raschka, 2017
+
+Python Machine Learning - Code Examples
+
+## Chapter 9 - Embedding a Machine Learning Model into a Web Application
+
+- Serializing fitted scikit-learn estimators
+- Setting up a SQLite database for data storage
+- Developing a web application with Flask
+- Our first Flask web application
+  - Form validation and rendering
+  - Turning the movie classifier into a web application
+- Deploying the web application to a public server
+  - Updating the movie review classifier
+- Summary
+
+---
+
+The code for the Flask web applications can be found in the following directories:
+
+- `1st_flask_app_1/`: A simple Flask web app
+- `1st_flask_app_2/`: `1st_flask_app_1` extended with flexible form validation and rendering
+- `movieclassifier/`: The movie classifier embedded in a web application
+- `movieclassifier_with_update/`: same as `movieclassifier` but with update from sqlite database upon start
+
+
+To run the web applications locally, `cd` into the respective directory (as listed above) and execute the main-application script, for example,
+
+    cd ./1st_flask_app_1
+    python3 app.py
+
+Now, you should see something like
+
+     * Running on http://127.0.0.1:5000/
+     * Restarting with reloader
+
+in your terminal.
+Next, open a web browser and enter the address displayed in your terminal (typically http://127.0.0.1:5000/) to view the web application.
+
+
+**Link to a live example application built with this tutorial: http://raschkas.pythonanywhere.com/**.