title: Read or Write items from a pandas dataframe
body: <p>I'm not sure how to phrase my search in order to find it so this is probably a duplicate. Please feel free to point me in the right direction.</p>
  
  <p>In pandas, I know that I can use <code>iloc</code> to grab particular pieces of a dataframe.
  <br>I'm curious to know if there is a way to Read or Write particular items from said dataframe. 
  <br>In one case, I could get <code>item08</code> by using <code>(1, 1)</code> and then reading it
  <br>Or perhaps I want <code>item28</code> I could use <code>(2, 4)</code></p>
  
  <p>Maybe I'd like to change <code>item22</code> on <code>(2, 3)</code> </p>
  
  <pre><code>  +--------------------------------------------+
  0 | item01 | item07 | item13 | item19 | item26 |
    +--------------------------------------------+
  1 | item02 | item08 | item14 | item21 | item27 |
    +--------------------------------------------+
  2 | item03 | item09 | item15 | item22 | item28 |
    +--------------------------------------------+
  3 | ...    | ...    | ...    | ...    | ...    |
    +--------------------------------------------+
        0         1        2        3        4
  </code></pre>
  
  <p>How can this be done?</p>