title: openpyxl change one word's color in the same cell
body: <p>I am using openpyxl to write some data to excel sheet. In my script, I need to append data to the same cell and highlight with different color for the new added data. Currently, I tried below but it turns out all the data's color will change at once. Is there any way to change one word's color in the same cell?</p>
  
  <pre><code>from openpyxl import Workbook
  from openpyxl.styles import Font
  from openpyxl.styles import colors
  book = Workbook()
  sheet = book.active
  sheet.cell(row=1, column=2).value = "11111"
  sheet.cell(row=1, column=2).font = Font(color=colors.GREEN)
  sheet.cell(row=1, column=2).value += " 12345"
  sheet.cell(row=1, column=2).font = Font(color=colors.RED)
  sheet.cell(row=1, column=2).value += " 22222"
  </code></pre>