title: Can't delete keys from HASH in Redis
body: <p>I have created a hash in redis database and i have put some keys and their values in it. I want now to delete everything that is in the hash.I am using hdel but i cannot make it work. I am confused on what should be in hdel(...) and the documentation doen't help me.Right now i have the following:</p>
  
  <pre><code>test_hash = redis_cache.hgetall(hash_name)
      for key,value in test_hash.items():
          i = redis_cache.hdel(hash_name,*key)
  </code></pre>
  
  <p>in hdel.() i have tried many different things but nothing seems to work.After the code "deletes" everything in the hash, i can still do redis_cache.hgetall() and get the same keys and values.
  Anyone that knows something more? I am using Python.</p>