title: How to work with two ipysheets at the same time. accesing cell atributes
body: <p>I want to render two ipysheets in a particular notebook
  as an example assume I have:</p>
  <pre><code>mysheet1 = ipysheet.sheet(rows=3, columns=4)
  mysheet2 = ipysheet.sheet(rows=3, columns=4)
  </code></pre>
  <p>If I now do:</p>
  <pre><code>cell1 = ipysheet.cell(0, 0, 'Hello')
  cell2 = ipysheet.cell(2, 0, 'World')
  cell_value = ipysheet.cell(2,2, 42.)
  </code></pre>
  <p>the values are changed in sheet 2.
  This is really weird. why is that that the last sheet created is modified?</p>
  <p>why is following not working?</p>
  <pre><code>cell1 = mysheet1.cell(0, 0, 'Hello')
  </code></pre>
  <p>nor</p>
  <pre><code>mysheet1.cell(0, 0, 'Hello')
  </code></pre>
  <p>I would assume that since all is an object in pyhton ipysheet is also an object but it &quot;cell&quot; is not an atribute of mysheet1.</p>
  <p>any plausible explanation?</p>
  <p>This is actually extendable to column atributes.</p>