11_APIArchitecturalPatternsCode.md

REST API (Representational State Transfer) Here's an example of a simple RESTful API that allows users to get, create, update, and delete tasks:

from flask import Flask, jsonify, request

app = Flask(__name__)

tasks = [
    {'id': 1, 'title': 'Task 1', 'description': 'This is task 1.', 'done': False},
    {'id': 2, 'title': 'Task 2', 'description': 'This is task 2.', 'done': False}
]

@app.route('/tasks', methods=['GET'])
def get_tasks():
    return jsonify({'tasks': tasks})

@app.route('/tasks/<int:task_id>', methods=['GET'])
def get_task(task_id):
    task = [task for task in tasks if task['id'] == task_id]
    if len(task) == 0:
        abort(404)
    return jsonify({'task': task[0]})

@app.route('/tasks', methods=['POST'])
def create_task():
    if not request.json or not 'title' in request.json:
        abort(400)
    task = {
        'id': tasks[-1]['id'] + 1,
        'title': request.json['title'],
        'description': request.json.get('description', ''),
        'done': False
    }
    tasks.append(task)
    return jsonify({'task': task}), 201

@app.route('/tasks/<int:task_id>', methods=['PUT'])
def update_task(task_id):
    task = [task for task in tasks if task['id'] == task_id]
    if len(task) == 0:
        abort(404)
    if not request.json:
        abort(400)
    task[0]['title'] = request.json.get('title', task[0]['title'])
    task[0]['description'] = request.json.get('description', task[0]['description'])
    task[0]['done'] = request.json.get('done', task[0]['done'])
    return jsonify({'task': task[0]})

@app.route('/tasks/<int:task_id>', methods=['DELETE'])
def delete_task(task_id):
    task = [task for task in tasks if task['id'] == task_id]
    if len(task) == 0:
        abort(404)
    tasks.remove(task[0])
    return jsonify({'result': True})

if __name__ == '__main__':
    app.run(debug=True)

SOAP API (Simple Object Access Protocol) Here's an example of a SOAP API client written in Python using the suds library:

from suds.client import Client

url = 'http://www.webservicex.net/CurrencyConvertor.asmx?WSDL'
client = Client(url)

result = client.service.ConversionRate('USD', 'EUR')
print(result)

GraphQL API Here's an example of a GraphQL API server written in Python using the graphql library:

from graphql import GraphQLSchema, GraphQLObjectType, GraphQLString, GraphQLInt
from flask import Flask, jsonify, request

app = Flask(__name__)

class User:
    def __init__(self, id, name):
        self.id = id
        self.name = name

users = [
    User(id=1, name='Alice'),
    User(id=2, name='Bob')
]

user_type = GraphQLObjectType(
    name='User',
    fields={
        'id': GraphQLField(GraphQLInt),
        'name': GraphQLField(GraphQLString)
    }
)

query_type = GraphQLObjectType```