title: replace -999.25 on all xlsx sheet cells by 0.01
body: <p>I have an xlsx sheet called 'Data' in a work book called '1046102004 Analysis.xlsx'
  Row 1 contains log names
  Row 2 contains log units
  Row 3 contains the data
  the sheet has the value -999.25 in different rows from 3 (fixed) to max_row and columns from 1 to max_cols
  I need to replace -999.25 with 0.01 for subsequent plotting
  Any help using python will be highly appreciated</p>
  <pre><code>fnm =&quot;S:/Python/New folder/1046102004 Analysis.xlsx&quot;
  NL = -999.25
  wb = openpyxl.load_workbook(fnm)
  ws = wb[&quot;Data&quot;]
  
  for row in ws:
          for cell in row:
             if cell.value == NL:
                 cell.value = 0.01
  </code></pre>