input: Write a function that creates a Flask web server in Python that serves a JSON object containing the current temperature for a city based on the city name provided in the request.
  
  
  assert get_temp({'city': 'London'}) == {'temperature': 280.32}
  assert get_temp({'city': 'Paris'}) == {'temperature': 290.75}
  assert get_temp({'city': 'New York'}) == {'temperature': 285.15}
  assert get_temp({'city': 'Tokyo'}) == {'temperature': 293.15}
  assert get_temp({'city': 'Sydney'}) == {'temperature': 300.15}
  
output: from flask import Flask, request, jsonify
  
  app = Flask(__name__)
  
  @app.route('/get_temp', methods=['POST'])
  def get_temp():
      city = request.json.get('city')
      temperatures = {
          'London': 280.32,
          'Paris': 290.75,
          'New York': 285.15,
          'Tokyo': 293.15,
          'Sydney': 300.15
      }
      return jsonify({'temperature': temperatures.get(city)})