title: Openpyxl with Python - How to delete spaces and replace with commas
body: <p>I am still new to python and have been asked to reformat a large spreadsheet.
  Trying to follow this system: <a href="https://i.stack.imgur.com/24Trp.png" rel="nofollow noreferrer">https://i.stack.imgur.com/24Trp.png</a></p>
  <p>I want to remove all the spaces in each cell from columns L &amp; M. Then, I need commas to separate the values. I'm unsure how to do the latter since I need to keep the colons (TL:Accepted,AL:Accepted) as one value and then separate them from the next value with a colon. I have some experience with pandas, which could work in conjunction with openpyxl.</p>
  <p>Here is my code so far:</p>
  <pre><code># imports
  import openpyxl as py
  from openpyxl import Workbook, load_workbook
  
  # create a workbook and active worksheet
  wb = load_workbook(r'MERGEDSHEETS.xlsx')
  print(wb.sheetnames)
  ws = wb.active
  
  for sheet[L2:, M2:]:
      py.strip()
  
  wb.save(r'MERGEDSHEETSv2.xlsx')
  </code></pre>