Flask uses the MVC (Model View Controller) Framework. Just to make this as obvious as possible, I like my Flask apps to have the following.

• Model -> models.py
• View -> views.py
• Controller -> __init__.py

Let's say your Flask app has the following files.

├── main.py
├── database (directory)
│   ├── example.db
├── my-project (directory)
│   ├── __init__.py
│   ├── views.py
│   ├── models.py
│   ├── templates (directory)
│   │   ├── base.html
│   │   ├── home.html
│   │   ├── results.html
│   └── static (directory)
│       └── custom.css

Let's say your view (views.py in this example) has the following.

from flask import Blueprint

views = Blueprint('views', __name__)

@views.route('/Test')
def test():
    return {"foo": "bar"}

Or, jsonify can be used.

from flask import Blueprint, jsonify

views = Blueprint('views', __name__)

@views.route('/Test')
def test():
    return jsonify(foo='bar')

In this example, navigating to /Test should return the JSON dictionary.

And here is how you could use an if statement based on whether or not the "foo" key contains "bar".

@views.route('/test')
def test():
    if my_dict['foo'] == "bar":
        return "success"
    else:
        return "failed"

requests can be used to submit a GET request to an API. First, use the pip install command to install the requests package.

pip install requests

Or, you can specify the version to install

pip install requests==2.28.2

Or, better yet, use a requirements.txt file.

install requests==2.28.2

And then install the packages using the requirements.txt file.

pip install --requirement requirements.txt

In your view, here is how you could submit a GET request to api.example.com/api. Check out my article Python - GET Request for more details on the Python side of this.

import requests

@views.route('/test')
def test():
    response = requests.get("http://api.example.com/api")

    if response:
        print(f"response = {response}")
        if response.content:
            print(f"response.content = {response.content}") 
        if response.text:
            print(f"response.text = {response.text}")          
        if response.json():
            print(f"response.json = {response.json()}")
            print(f"response.json()['foo'] = {response.json()['foo']}")

    return render_template('bar.html')

Which should print something like this.

response = <Response [200]>
response.text = {"foo": "hello world"}
reponse.json  = {'foo': 'hello world'}
foo           = hello world

Here is how you can use the JSON in an if statement.

import requests

@views.route('/test')
def test():
    response = requests.get("http://api.example.com/api")

    if response.json()['foo'] == "Hello World":
      print("foo equals Hello World")
    else:
      print("foo does not equal Hello World")

    return render_template('bar.html')