{"id":16693,"date":"2024-03-15T13:27:52","date_gmt":"2024-03-15T13:27:52","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-can-columns-be-modified-in-bulk-in-pandas\/"},"modified":"2025-08-07T05:05:51","modified_gmt":"2025-08-07T05:05:51","slug":"how-can-columns-be-modified-in-bulk-in-pandas","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-can-columns-be-modified-in-bulk-in-pandas\/","title":{"rendered":"How can columns be modified in bulk in pandas?"},"content":{"rendered":"

To batch modify column values in a Pandas DataFrame, you can use the following two methods:<\/p>\n

    \n
  1. use()<\/li>\n<\/ol>\n
    df['column_name'<\/span>] = df['column_name'<\/span>].apply(lambda<\/span> x: 'new_value'<\/span> if<\/span> x == 'old_value'<\/span> else<\/span> x)\r\n<\/code><\/pre>\n
    The above code replaces all instances of ‘old_value’ with ‘new_value’ in the column named ‘column_name’ in the dataframe df.<\/p>\n
      \n
    1. Make a substitution<\/li>\n<\/ol>\n
      df['column_name'<\/span>].replace('old_value'<\/span>, 'new_value'<\/span>, inplace=True<\/span>)\r\n<\/code><\/pre>\n
      The code above replaces all occurrences of the ‘old_value’ in column ‘column_name’ in the dataframe df with the ‘new_value’. Setting inplace=True means the modification will be applied directly to the original dataframe.<\/p>\n
      Please replace ‘column_name’, ‘old_value’, and ‘new_value’ with the actual values in the above code.<\/p>\n","protected":false},"excerpt":{"rendered":"
      To batch modify column values in a Pandas DataFrame, you can use the following two methods: use() df[‘column_name’] = df[‘column_name’].apply(lambda x: ‘new_value’ if x == ‘old_value’ else x) The above code replaces all instances of ‘old_value’ with ‘new_value’ in the column named ‘column_name’ in the dataframe df. Make a substitution df[‘column_name’].replace(‘old_value’, ‘new_value’, inplace=True) The code […]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[453,1402,299,1404,1403],"class_list":["post-16693","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-development","tag-guide","tag-programming","tag-technology","tag-tutorial"],"yoast_head":"\nHow can columns be modified in bulk in pandas? - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn about how can columns be modified in bulk in pandas?. 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