title: Python openpyxl not writing to cell
body: <p>I am trying to read a value from an excel say A1 == 4 and using these </p>
  
  <pre><code>wb = load_workbook("GameExcel.xlsx")
  names = wb.sheetnames
  sheet = wb['GameEnviroment']
  sheet['C4'].value 
  </code></pre>
  
  <p>and it reads the information of the current cell just fine, but it doesn't want to write to the cell. There are no errors, it just doesn't work. this is the write code</p>
  
  <pre><code>C3Val = sheet['C4'].value
  sheet.cell(row=3, column=4).value = (C3Val + ' 3')
  </code></pre>