old_contents: # The MIT License (MIT)
  #
  # Copyright (c) 2017 Stefan Graupner
  #
  # Permission is hereby granted, free of charge, to any person obtaining a copy
  # of this software and associated documentation files (the "Software"), to deal
  # in the Software without restriction, including without limitation the rights
  # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  # copies of the Software, and to permit persons to whom the Software is
  # furnished to do so, subject to the following conditions:
  #
  # The above copyright notice and this permission notice shall be included in all
  # copies or substantial portions of the Software.
  #
  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  # SOFTWARE.
  
  import redis
  
  class Cache:
      basekey = ""
      ttl = 300
  
      def __init__(self, basekey="", ttl=300):
          self.basekey = basekey
          self.ttl = ttl
  
      def has(self, key):
          return False
  
      def get(self, key):
          return ""
  
      def set(self, key, value, ttl=300):
          pass
  
      def fullkey(self, key):
          if len(self.basekey) > 0:
              return "{}:{}".format(self.basekey, key)
          else:
              return key
  
  class RedisCache(Cache):
      redis = None
  
      def __init__(self, basekey="", ttl=300, redis_server='localhost', redis_port=6379):
          Cache.__init__(self, basekey, ttl)
          self.redis = redis.Redis(host=redis_server, port=redis_port, db=0)
  
      def has(self, key):
          return self.redis.exists(self.fullkey(key))
  
      def get(self, key):
          return self.redis.get(self.fullkey(key))
  
      def set(self, key, value, ttl=300):
          return self.redis.set(self.fullkey(key), value, ttl)
  
new_contents: # The MIT License (MIT)
  #
  # Copyright (c) 2017 Stefan Graupner
  #
  # Permission is hereby granted, free of charge, to any person obtaining a copy
  # of this software and associated documentation files (the "Software"), to deal
  # in the Software without restriction, including without limitation the rights
  # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  # copies of the Software, and to permit persons to whom the Software is
  # furnished to do so, subject to the following conditions:
  #
  # The above copyright notice and this permission notice shall be included in all
  # copies or substantial portions of the Software.
  #
  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  # SOFTWARE.
  
  import redis
  
  class Cache:
      basekey = ""
  
      def __init__(self, basekey=""):
          self.basekey = basekey
  
      def has(self, key):
          return False
  
      def get(self, key):
          return ""
  
      def set(self, key, value, ttl=0):
          pass
  
      def fullkey(self, key):
          if len(self.basekey) > 0:
              return "{}:{}".format(self.basekey, key)
          else:
              return key
  
  class RedisCache(Cache):
      redis = None
  
      def __init__(self, basekey="", redis_server='localhost', redis_port=6379):
          Cache.__init__(self, basekey)
          self.redis = redis.Redis(host=redis_server, port=redis_port, db=0)
  
      def has(self, key):
          return self.redis.exists(self.fullkey(key))
  
      def get(self, key):
          return self.redis.get(self.fullkey(key))
  
      def set(self, key, value, ttl=600):
          return self.redis.set(self.fullkey(key), value, ttl)
  
subject: Remove ttl from cache constructor