title: python gspread library only writes to worksheet labeled 'sheet1'
body: <p>My sheet is named 'doc_name', and it has two worksheets, 'sheet1' and 'sheet2'. but, i can only write data to the worksheet labeled 'sheet1'?</p>
  
  <p>is this a limitation or am i doing something wrong?</p>
  
  <p>this works,</p>
  
  <pre><code>wks = gc.open("doc_name").sheet1
  </code></pre>
  
  <p>but this fails,</p>
  
  <pre><code>wks = gc.open("doc_name").sheet2
  </code></pre>
  
  <p>giving this error,</p>
  
  <p><strong>AttributeError: 'Spreadsheet' object has no attribute 'sheet2'</strong></p>
  
  <p>i also notice that this fails,</p>
  
  <p>wks = gc.open("doc_name").<strong>S</strong>heet1</p>
  
  <p>...where i use a capital 'S'.. and it will only write if i specify lowercase .<strong>s</strong>heet1</p>
  
  <p>how do i write to a worksheet without having to code... wks = gc.open("doc_name").sheet1?</p>