title: Convert df column to a tuple
body: <p>I am having trouble converting a df column into a tuple that I can iterate through. I started with a simple code that works like this:</p>
  
  <pre><code> set= 'pare-10040137', 'pare-10034330', 'pare-00022936', 'pare-10025987', 'pare-10036617'
  
   for i in set:
  
       ref_data=req_data[req_data['REQ_NUM']==i] 
  </code></pre>
  
  <p>This works fine, but now I want my set to come from a df. The df looks like this:</p>
  
  <pre><code> open_reqs
  
  Out[233]: 
            REQ_NUM
  4825  pare-00023728
  4826  pare-00023773 
  .... ..............
  </code></pre>
  
  <p>I want all of those <code>REQ_NUM</code> values thrown into a tuple, so I tried to do <code>open_reqs.apply(tuple, axis=1)</code> and <code>tuple(zip(open_reqs.columns,open_reqs.T.values.tolist()))</code> but it's not able to iterate through either of these. </p>
  
  <p>My old set looks like this, so this is the format I need to match to iterate through like I was before. I'm not sure if the <code>Unicode</code> is also an issue (when I print above I get  (u'pare-10052173',) </p>
  
  <pre><code> In[236]: set
   Out[236]: 
   ('pare-10040137',
    'pare-10034330',
    'pare-00022936',
    'pare-10025987',
    'pare-10036617')
  </code></pre>
  
  <p>So basically I need the magic code to get a nice simple set like that from the REQ_NUM column of my open_reqs table. Thank you! </p>