title: Can't write data into Excel-Sheet using openpyxl Workbook
body: <p>I'm trying to write to specific cells in a Excel-Sheet using openpyxl Workbook. At first I couldn't write to cells that already had data in them and now I can't write at all (or I'm just going crazy).</p>
  
  <p>Here's my code:</p>
  
  <pre><code>    wb = load_workbook("..\\..\\Decision Tree Classifier  TPS\\Decision Tree Classifier  TPS\\TestData.xlsx")
      ws1 = wb.get_sheet_by_name("Sheet1")
  
      #this works
      print(ws1.cell(row=1, column=1).value)
  
      #these do not
      ws1['D3'] = 5
      ws1.cell(row=5, column=1).value = "SomeValue2"
      ws1.cell(row=7, column=1,value='Hey')
      ws1.cell(row=6, column=1).value = 'TEST'
  
      wb.save("TestData.xlsx")
  </code></pre>
  
  <p>I get no errors, the print line works, the write lines do not.</p>
  
  <p>Similar problem here <a href="https://stackoverflow.com/q/29901558/11580452">Writing data into Excel-Sheet using openpyxl isn&#39;t working</a>, except I have the save function.  </p>
  
  <p>What gives?</p>