aider/examples/hello-world-flask.md
2023-05-15 21:04:46 -07:00

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# Create a simple flask app with aider & gpt-4
In this chat transcript, the user asks to make a simple flask app with various endpoints.
## Chat transcript
> $ aider app.py
> Creating empty file app.py
> Added app.py to the chat
#### make a flask app with a /hello endpoint that returns hello world
To create a Flask app with a `/hello` endpoint that returns "Hello, World!", we need to install Flask, import it, create an app instance, and define a route for the `/hello` endpoint. Here's how to update the `app.py` file:
```python
app.py
<<<<<<< ORIGINAL
=======
from flask import Flask
app = Flask(__name__)
@app.route('/hello')
def hello():
return "Hello, World!"
if __name__ == '__main__':
app.run()
>>>>>>> UPDATED
```
Make sure to install Flask in your project environment using `pip install flask` before running the app.
> Applied edit to app.py
> Commit 414c394 aider: Added a `/hello` endpoint that returns "Hello, World!" to the Flask app.
#### add an endpoint like /add/3/5 which returns the sum of the 2 numbers
To add an endpoint like `/add/3/5` that returns the sum of the two numbers, you can create a new route with two URL parameters. Update the `app.py` file as follows:
```python
app.py
<<<<<<< ORIGINAL
@app.route('/hello')
def hello():
return "Hello, World!"
=======
@app.route('/add/<int:num1>/<int:num2>')
def add(num1, num2):
return str(num1 + num2)
@app.route('/hello')
def hello():
return "Hello, World!"
>>>>>>> UPDATED
```
Now, when you visit `/add/3/5`, it will return the sum of the two numbers, which is `8`.
> Applied edit to app.py
> Commit 0872c51 aider: Added an endpoint `/add/<int:num1>/<int:num2>` that returns the sum of the two numbers.
#### add /fibonacci/X
To add a `/fibonacci/X` endpoint that returns the Xth number in the Fibonacci sequence, you can create a new route with a URL parameter for X and a function to calculate the Fibonacci number. Update the `app.py` file as follows:
```python
app.py
<<<<<<< ORIGINAL
@app.route('/hello')
def hello():
return "Hello, World!"
=======
def fibonacci(n):
if n <= 0:
return "Invalid input. Please enter a positive integer."
elif n == 1:
return 0
elif n == 2:
return 1
else:
a, b = 0, 1
for _ in range(n - 2):
a, b = b, a + b
return b
@app.route('/fibonacci/<int:x>')
def fibonacci_x(x):
return str(fibonacci(x))
@app.route('/hello')
def hello():
return "Hello, World!"
>>>>>>> UPDATED
```
Now, when you visit `/fibonacci/X`, it will return the Xth number in the Fibonacci sequence. For example, `/fibonacci/5` will return `3`.
> Applied edit to app.py
> Commit 163fba8 aider: Added a `/fibonacci/X` endpoint that returns the Xth number in the Fibonacci sequence.
#### remove the hello endpoint
To remove the `/hello` endpoint, you can simply delete the corresponding route and function in the `app.py` file. Here's the update:
```python
app.py
<<<<<<< ORIGINAL
@app.route('/hello')
def hello():
return "Hello, World!"
=======
>>>>>>> UPDATED
```
Now, the `/hello` endpoint has been removed from the Flask app.
> Applied edit to app.py
> Commit eab6620 aider: Removed the `/hello` endpoint from the Flask app.