Abschließende Gedanken

Einführung in APIs mit Python

Chris Ramakers

Engineering Manager

API-Grundlagen

Rolle von APIs
API-Typen
URL-Bausteine
Aufbau von Request & Response
HTTP-Verben

APIs mit Python

Requests-Paket

import requests

HTTP-Methoden

# Ressource lesen
requests.get('https://api.my-music.com')
# Ressource erstellen
requests.post('https://api.my-music.com', data={...})
# Ressource aktualisieren
requests.put('https://api.my-music.com', data={...})
# Ressource löschen
requests.delete('https://api.my-music.com')

URL-Parameter

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

Header

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

Statuscodes

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

Fortgeschrittene Themen

Authentifizierung

Basic Authentication

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

API-Key/Token-Auth

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

Strukturierte Daten

JSON anfordern

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

JSON senden

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

Fehlerbehandlung

Fehlertypen
- Verbindungsfehler
- HTTP-Fehler
  - 4XX Client-Fehler
  - 5XX Server-Fehler
Fehler per Statuscodes behandeln
- response.status_code
Fehler per Exceptions behandeln
- 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}')

Glückwunsch!

Einführung in APIs mit Python