{"id":27,"date":"2026-01-31T11:28:06","date_gmt":"2026-01-31T03:28:06","guid":{"rendered":"https:\/\/openpyxl.com\/blog\/?p=27"},"modified":"2026-01-16T06:51:01","modified_gmt":"2026-01-16T06:51:01","slug":"how-to-set-cell-styles-using-openpyx-number-format","status":"publish","type":"post","link":"https:\/\/openpyxl.com\/blog\/how-to-set-cell-styles-using-openpyx-number-format.html","title":{"rendered":"How To Set Cell Styles Using OpenPyX – Number Format"},"content":{"rendered":"

Method<\/h2>\n

Use the `numbers` module and the `number_format` property of the cell object to set number formats.<\/p>\n

>>> from openpyxl.styles import numbers<\/p>\n

There are two ways to set the number format:<\/span><\/p>\n

1. Using the built-in constants of OpenPyXl:<\/h3>\n
\n

>> ws[“D2”].number_format=numbers.FORMAT_GENERAL<\/p>\n<\/blockquote>\n

2. Using a string representation of the number format:<\/h3>\n
\n

>> ws[“D6″].number_format=”yy-mm-dd”<\/p>\n<\/blockquote>\n

\n

>> ws[“D8″].number_format=”d-mmm-yy”<\/p>\n<\/blockquote>\n

To display numbers in scientific notation:<\/p>\n

\n

>> ws[“D4”].number_format = ‘0.00E+00’<\/p>\n<\/blockquote>\n

\u00a0<\/p>\n

The available format constants and strings in OpenPyXl are as follows:<\/p>\n

    \n
  • FORMAT_GENERAL=”General”<\/span><\/li>\n
  • FORMAT_TEXT=”@”<\/span><\/li>\n
  • FORMAT_NUMBER=”0″<\/span><\/li>\n
  • FORMAT_NUMBER_00=”0.00″<\/span><\/li>\n
  • FORMAT_NUMBER_COMMA_SEPARATED1=”#,##0.00″<\/span><\/li>\n
  • FORMAT_NUMBER_COMMA_SEPARATED2=”#,##0.00_-“<\/span><\/li>\n
  • FORMAT_PERCENTAGE=”0%”<\/span><\/li>\n
  • FORMAT_PERCENTAGE_00=”0.00%”<\/span><\/li>\n
  • FORMAT_DATE_YYYYMMDD2=”yyyy-mm-dd”<\/span><\/li>\n
  • FORMAT_DATE_YYMMDD=”yy-mm-dd”<\/span><\/li>\n
  • FORMAT_DATE_DDMMYY=”dd\/mm\/yy”<\/span><\/li>\n
  • FORMAT_DATE_DMYSLASH=”d\/m\/y”<\/span><\/li>\n
  • \u2026\u2026<\/span><\/li>\n<\/ul>\n

    Sample Code<\/h2>\n\n\n
    #Cell Style: Setting Number Formats\n\n#Import load_workbook function\nfrom openpyxl import Workbook\n\n#Create a new workbook\nwb=Workbook()\n#Get the active worksheet\nws=wb.active\n\n#Import numbers class\nfrom openpyxl.styles import numbers\nimport datetime\n\n#Set the number format\nws['D2']='Test123'\nws['D6']=datetime.datetime.today()\nws['D8']=datetime.datetime.today()\nws['D4']=123.456789\nws['D2'].number_format=numbers.FORMAT_GENERAL\nws['D6'].number_format='yy-mm-dd'\nws['D8'].number_format='d-mmm-yy'\nws['D4'].number_format='0.00E+00'\n\nwb.save('test.xlsx')\nwb.close()<\/code><\/pre>\n\n\n\n
    \"Set<\/figure>\n\n\n\n
    <\/p>\n","protected":false},"excerpt":{"rendered":"
    OpenPyXL<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-27","post","type-post","status-publish","format-standard","hentry","category-openpyxl-cell-range"],"_links":{"self":[{"href":"https:\/\/openpyxl.com\/blog\/wp-json\/wp\/v2\/posts\/27","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/openpyxl.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/openpyxl.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/openpyxl.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/openpyxl.com\/blog\/wp-json\/wp\/v2\/comments?post=27"}],"version-history":[{"count":2,"href":"https:\/\/openpyxl.com\/blog\/wp-json\/wp\/v2\/posts\/27\/revisions"}],"predecessor-version":[{"id":258,"href":"https:\/\/openpyxl.com\/blog\/wp-json\/wp\/v2\/posts\/27\/revisions\/258"}],"wp:attachment":[{"href":"https:\/\/openpyxl.com\/blog\/wp-json\/wp\/v2\/media?parent=27"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/openpyxl.com\/blog\/wp-json\/wp\/v2\/categories?post=27"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/openpyxl.com\/blog\/wp-json\/wp\/v2\/tags?post=27"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}