input: Write a python function to check if a memcache server is alive.
  ```python
  def memc_alive():
      try:
          global memc
          key = str(uuid.uuid4())
          memc.set('poller.ping.' + key, key, 60)
          if memc.get('poller.ping.' + key) == key:
              memc.delete('poller.ping.' + key)
              return True
          else:
              return False
      except:
          return False
  
  # Test cases
  assert memc_alive() == True or memc_alive() == False  # Since this depends on the actual server, it should return either True or False
output: import uuid
  import memcache
  
  memc = memcache.Client(['127.0.0.1:11211'], debug=0)  # Point this to your memcache server
  
  def memc_alive():
      try:
          global memc
          key = str(uuid.uuid4())
          memc.set('poller.ping.' + key, key, 60)
          if memc.get('poller.ping.' + key) == key:
              memc.delete('poller.ping.' + key)
              return True
          else:
              return False
      except:
          return False