Building a Simple Language Learning App with Flask and MongoDB
Creating a language learning app that allows users to practice their language skills through interactive exercises and quizzes can be a great way to help users improve their proficiency in a new language. In this blog post, we will go over the process of building a simple language learning app using the Flask web framework, and a MongoDB database to store the exercises and quizzes.
The first step in building our language learning app is to set up our project directory and install the necessary dependencies. We'll be using Flask to handle routing and rendering templates, PyMongo to connect to the MongoDB database, and Flask-MongoEngine, a Flask extension that simplifies working with MongoDB. To start, create a new directory for your project and run the following commands to create a virtual environment and install the dependencies.
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$ python3 -m venv venv
$ source venv/bin/activate
(venv) $ pip install flask pymongo flask_mongoengine
Next, we'll create a new file called app.py in our project directory. This will be the main file for our Flask app. We'll start by importing the necessary libraries and creating a new Flask app.
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from flask import Flask, render_template, request
from flask_mongoengine import MongoEngine
app = Flask(__name__)
app.config['MONGODB_SETTINGS'] = {
'db': 'language_learning',
'host': 'mongodb://localhost:27017/language_learning'
}
db = MongoEngine(app)
Next, we'll create a MongoDB model for storing the exercises and quizzes. The model will have fields for the exercise or quiz text, the correct answer, and possible answer choices.
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import datetime
class Exercise(db.Document):
text = db.StringField(required=True)
answer = db.StringField(required=True)
choices = db.ListField(db.StringField(), required=True)
created_at = db.DateTimeField(default=datetime.datetime.now)
With the model in place, we can now create routes to handle displaying exercises and quizzes to the user, and handling their answers. For example, we can create a route that displays a random exercise to the user and a route to handle their answer and check if it is correct.
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import random
@app.route('/exercise')
def exercise():
exercise = Exercise.objects.aggregate(*[{ "$sample": { "size": 1 } }]).next()
return render_template('exercise.html', exercise=exercise)
@app.route('/check_answer', methods=['POST'])
def check_answer():
exercise_id = request.form['exercise_id']
answer = request.form['answer']
exercise = Exercise.objects.get(id=exercise_id)
if exercise.answer == answer:
return "Correct!"
else:
return "Incorrect. The correct answer is {}".format(exercise.answer)
Finally, we'll need to create template files for each of the routes we've defined above. We'll create exercise.html to display the exercise to the user and a form to allow them to submit their answer.
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<!-- exercise.html -->
<form action="{{
url_for('check_answer') }}" method="post">
<input type="hidden" name="exercise_id" value="{{ exercise.id }}">
<p>{{ exercise.text }}</p>
{% for choice in exercise.choices %}
<label for="{{ choice }}">
<input type="radio" name="answer" value="{{ choice }}" id="{{ choice }}">
{{ choice }}
</label>
{% endfor %}
<input type="submit" value="Submit">
</form>
```
You could also provide a selection of different languages for the user to practice and a simple way to switch between them.
To make this more engaging, you could create different types of exercises such as multiple choice, fill-in-the-blank, matching exercises etc. You could also add a feature for users to save their progress and pick up from where they left off.
I hope this gives you a good starting point for building your own language learning app. Remember to also take care of user authentication and securing their data. Don't hesitate to reach out if you have any questions about the code or the process.
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