Python REST APIs – Building and Consuming Web Services - Learn PYTHON-BACKEND | Revochamp

Name: Python REST APIs – Building and Consuming Web Services
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Author: Revochamp

What is a REST API?

A REST (Representational State Transfer) API is an architectural style for providing an interface between systems over HTTP. In the Python ecosystem, APIs are the backbone of modern web and mobile development, allowing your Flutter apps or React frontends to communicate with a Python backend to fetch data, authenticate users, or process AI tasks.

Consuming APIs with 'Requests'

The requests library is the industry standard for making HTTP calls in Python. It is much more intuitive than the built-in urllib and handles JSON, headers, and authentication with minimal code.

PythonRead-only

import requests

# GET Request
response = requests.get('https://api.example.com/data')
if response.status_code == 200:
    data = response.json()
    print(data)

# POST Request with JSON body
payload = {'title': 'New Post', 'body': 'Hello World'}
res = requests.post('https://api.example.com/posts', json=payload)
print(res.status_code) # 201 Created

import requests

# GET Request
response = requests.get('https://api.example.com/data')
if response.status_code == 200:
    data = response.json()
    print(data)

# POST Request with JSON body
payload = {'title': 'New Post', 'body': 'Hello World'}
res = requests.post('https://api.example.com/posts', json=payload)
print(res.status_code) # 201 Created

Building APIs: FastAPI vs. Flask

When it comes to building your own API, you have two main choices. In 2026, FastAPI is the preferred choice for new projects due to its speed and native support for asynchronous code and type hinting.

Feature	Flask	FastAPI
Performance	Standard (Synchronous)	High (Asynchronous/Asgi)
Typing	Not enforced	Strongly enforced (Pydantic)
Documentation	Manual (Swagger plugins)	Automatic (/docs)
Ease of Use	Very simple / Minimal	Developer-friendly / Modern
Best For	Small scripts / Simple sites	Production APIs / AI services

FastAPI Quick Start

FastAPI uses Python type hints to validate data automatically. It also generates interactive API documentation (Swagger UI) by default.

PythonRead-only

from fastapi import FastAPI

app = FastAPI()

@app.get("/hello")
def read_root():
    return {"message": "Hello from Python Backend"}

@app.get("/items/{item_id}")
def read_item(item_id: int, q: str = None):
    return {"item_id": item_id, "query": q}

from fastapi import FastAPI

app = FastAPI()

@app.get("/hello")
def read_root():
    return {"message": "Hello from Python Backend"}

@app.get("/items/{item_id}")
def read_item(item_id: int, q: str = None):
    return {"item_id": item_id, "query": q}

Common HTTP Methods

GET: Retrieve data from the server (Read).
POST: Submit new data to the server (Create).
PUT / PATCH: Update existing data (Update).
DELETE: Remove data from the server (Delete).

Test Your Knowledge

of 3

Which HTTP method is used to update an existing resource on a server?

GET

POST

PUT

DELETE

of 3

Which Python library is most commonly used to consume (request) APIs?

FastAPI

Flask

Requests

Pandas

of 3

What is the status code for a successful 'Created' resource?

200

201

404

500

Frequently Asked Questions

What is Uvicorn?

Uvicorn is a lightning-fast ASGI server implementation. While FastAPI provides the logic, Uvicorn is the actual 'engine' that runs the server and handles the web requests.

How do I handle authentication in a Python API?

The most common method is using JWT (JSON Web Tokens). Libraries like 'python-jose' and FastAPI's built-in OAuth2 support make it easy to protect routes.

Is FastAPI faster than Node.js?

In many benchmarks, FastAPI performs on par with or even faster than Node.js and Go, thanks to its underlying Starlette framework and Uvicorn server.

import requests # GET Request response = requests.get('https://api.example.com/data') if response.status_code == 200: data = response.json() print(data) # POST Request with JSON body payload = {'title': 'New Post', 'body': 'Hello World'} res = requests.post('https://api.example.com/posts', json=payload) print(res.status_code) # 201 Created

Feature

Flask

FastAPI

Performance

Standard (Synchronous)

High (Asynchronous/Asgi)

Typing

Not enforced

Strongly enforced (Pydantic)

Documentation

Manual (Swagger plugins)

Automatic (/docs)

Ease of Use

Very simple / Minimal

Developer-friendly / Modern

Best For

Small scripts / Simple sites

Production APIs / AI services

from fastapi import FastAPI app = FastAPI() @app.get("/hello") def read_root(): return {"message": "Hello from Python Backend"} @app.get("/items/{item_id}") def read_item(item_id: int, q: str = None): return {"item_id": item_id, "query": q}

Test Your Knowledge

of 3

Which HTTP method is used to update an existing resource on a server?

GET

POST

PUT

DELETE

of 3

Which Python library is most commonly used to consume (request) APIs?

FastAPI

Flask

Requests

Pandas

of 3

What is the status code for a successful 'Created' resource?

200

201

404

500

Frequently Asked Questions

What is Uvicorn?

Uvicorn is a lightning-fast ASGI server implementation. While FastAPI provides the logic, Uvicorn is the actual 'engine' that runs the server and handles the web requests.

How do I handle authentication in a Python API?

The most common method is using JWT (JSON Web Tokens). Libraries like 'python-jose' and FastAPI's built-in OAuth2 support make it easy to protect routes.

Is FastAPI faster than Node.js?

In many benchmarks, FastAPI performs on par with or even faster than Node.js and Go, thanks to its underlying Starlette framework and Uvicorn server.

Python REST APIs – Building and Consuming Web Services

Python REST APIs – Building and Consuming Web Services

What is a REST API?

Consuming APIs with 'Requests'

Building APIs: FastAPI vs. Flask

FastAPI Quick Start

Common HTTP Methods

Test Your Knowledge

Frequently Asked Questions

Need help?

Python REST APIs – Building and Consuming Web Services

Python REST APIs – Building and Consuming Web Services

What is a REST API?

Consuming APIs with 'Requests'

Building APIs: FastAPI vs. Flask

FastAPI Quick Start

Common HTTP Methods

Test Your Knowledge

Frequently Asked Questions

Need help?