Sammanfattning

Introduktion till API:er i Python

Chris Ramakers

Engineering Manager

API-grunder

API:ers roll
Olika typer av API:er
URL-komponenter
Uppbyggnad av förfrågnings- och svarsmeddelanden
HTTP-verb

API:er med Python

Requests-paketet

import requests

HTTP-metoder

# Read a resource
requests.get('https://api.my-music.com')
# Create a resource
requests.post('https://api.my-music.com', data={...})
# Update a resource
requests.put('https://api.my-music.com', data={...})
# Delete a resource
requests.delete('https://api.my-music.com')

URL-parametrar

query_params = {'artist': 'Deep Purple'}
requests.get('http://api.my-music.com', params=query_params)

Headers

headers = {'accept': 'application/json'}
response = requests.get('http://api.my-music.com', headers=headers)
print(response.headers.get('content-type'))

Statuskoder

response = requests.get('http://api.my-music.com')
print(response.status_code)

Avancerade ämnen

Autentisering

Basic Authentication

headers = {'Authorization':'Basic am9obkBleGF...'}

API-nyckel/token-autentisering

headers = {'Authorization': 'Bearer faaa1c9f4...'}

Strukturerad data

Begära JSON-formaterad data

requests.get('https://api.my-music.com', headers={'accept': 'application/json'})

Skicka JSON-formaterad data

playlists = [{"Name":"My favorite songs"}, {"Name":"Road Trip"}]
requests.post('https://api.my-music.com/playlists/', json=playlists)

Felhantering

Typer av fel
- Anslutningsfel
- HTTP-fel
  - 4XX Klientfel
  - 5XX Serverfel
Hantera fel med statuskoder
- response.status_code
Hantera fel med undantag
- raise_for_error()

import requests
from requests.exceptions import ConnectionError, HTTPError

try:
    response = requests.get("http://api.music-catalog.com/albums") 
    response.raise_for_status()

except ConnectionError as conn_err: 
    print(f'Connection Error! {conn_err}.')

except HTTPError as http_err:
    print(f'HTTP error occurred: {http_err}')

Grattis!

Introduktion till API:er i Python