This is the second part of a series about the Flask framework, a common tool used to create web applications with Python.

Objectives

The part 2 will focus on creating HTTP methods to our web API.
The full example is available here: Python-Flask.

Topics

• GET
• POST
• PUT
• DELETE

GET

Create a dictionary called users_dict to be returned after a GET request:

Access the URL below and see the result:

http://127.0.0.1:5000/users

Create another method to return a user by id:

Access the URL below and see the result:

http://127.0.0.1:5000/user?id=1

Return a user by id passing the parameter in the path:

Access the URL below and see the result:

http://127.0.0.1:5000/user/1

POST

To simulate a POST request, remove all dictionaries from users_dict:

Create a POST method with the following code:

Execute a POST request sending a new user. You can use the Postman to make the request:

The result will be:

A new user was added to the users_dict. Make some changes at the get_users function to search for the user by using multiple properties dynamically, even by considering their types.

This way there will be many possible queries with the same method:

PUT

To update a user, create this method:

Execute a PUT request:

The result will be:

DELETE

To delete a user by id, write this code:

Execute a DELETE request:

The result will be:

Next

We will connect our web API with a local database.