如何在python中使用panda在現有excel表中追加列

Question

import pandas as pd

from pandas import ExcelWriter

trans=pd.read_csv('HMIS-DICR-2011-12-Manipur-Bishnupur.csv')
df=trans[["April 10-11","May 10-11","June 10-11","July 10-11","August 10-11","September 10-11","October 10-11","November 10-11","December 10-11","January 10-11","February 10-11","March 10-11","April 11-12","May 11-12","June 11-12","July 11-12","August 11-12","September 11-12","October 11-12","November 11-12","December 11-12","January 11-12","February 11-12","March 11-12"]]
writer1 = ExcelWriter('manipur1.xlsx')
df.to_excel(writer1,'Sheet1',index=False)
writer1.save()

此代碼成功地將數據寫入工作表1但是如何將另一個數據框（df）的數據從不同的excel文件（下面提到）附加到現有工作表（sheet1）“manipur1”excel文件中

例如：我的數據框如下：

 trans=pd.read_csv('HMIS-DICR-2013-2014-Manipur-Bishnupur.csv')
    df=trans[["April 12-13","May 12-13","June 12-13","July 12-13","August 12-13","September 12-13","October 12-13","November 12-13","December 12-13","January 12-13","February 12-13","March 12-13","April 13-14","May 13-14","June 13-14","July 13-14","August 13-14","September 13-14","October 13-14","November 13-14","December 13-14","January 13-14","February 13-14","March 13-14"]]

Answer 1

在將現有數據加載到pandas，附加新數據以及再次保存連接數據幀時，只能將新數據附加到現有excel文件。

要保留應保持不變的現有工作表，您需要遍歷整個工作簿並處理每個工作表。 要更改和追加的表格在to_update字典中定義。

# get data to be appended
trans=pd.read_csv('HMIS-DICR-2011-12-Manipur-Bishnupur.csv')
df_append = trans[["April 12-13","May 12-13","June 12-13","July 12-13","August 12-13","September 12-13","October 12-13","November 12-13","December 12-13","January 12-13","February 12-13","March 12-13","April 13-14","May 13-14","June 13-14","July 13-14","August 13-14","September 13-14","October 13-14","November 13-14","December 13-14","January 13-14","February 13-14","March 13-14"]]

# define what sheets to update
to_update = {"Sheet1": df_append}

# load existing data
file_name = 'manipur1.xlsx'
excel_reader = pd.ExcelFile(file_name)

# write and update
excel_writer = pd.ExcelWriter(file_name)

for sheet in excel_reader.sheet_names:
    sheet_df = excel_reader.parse(sheet)
    append_df = to_update.get(sheet)

    if append_df is not None:
        sheet_df = pd.concat([sheet_df, append_df], axis=1)

    sheet_df.to_excel(excel_writer, sheet, index=False)

excel_writer.save()

但是，現有Excel中的任何布局/格式都將丟失。 如果要保留格式，可以使用openpyxl ，但這更復雜。