input: Write a function to create a web server in Python using the Flask framework that serves a JSON object containing the current temperature for a city based on the city name provided in the request.
  
  from flask import Flask, request
  import requests
  import json
  
  app = Flask(__name__)
  
  @app.route('/getTemp', methods=['POST'])
  def get_temp():
      city = request.json['city']
      url = 'http://api.openweathermap.org/data/2.5/weather?q={}&APPID=xxxxxx'
      r = requests.get(url.format(city))
      weather = json.loads(r.text)
      return {'temperature': weather['main']['temp']}
  
  if __name__ == '__main__':
      app.run(debug=True)
  
  assert get_temp('London')=={'temperature': 280.32}
  assert get_temp('Paris')=={'temperature': 285.50}
  assert get_temp('Tokyo')=={'temperature': 290.15}
output: 
  def get_temp():
      city = request.json['city']
      url = 'http://api.openweathermap.org/data/2.5/weather?q={}&APPID=xxxxxx'
      r = requests.get(url.format(city))
      weather = json.loads(r.text)
      return {'temperature': weather['main']['temp']}
  