python - ExcelWriter 在书写时覆盖工作表

Question

该程序应将各个工作表的内容放入一个 Excel 工作簿中。它几乎做到了，但它是覆盖而不是将新工作表 append 到最终工作簿中。我读到 pandas excel writer 是解决这个问题的方法，关于为什么它有这种行为有什么想法吗？

import xlwt, csv, os
from openpyxl import load_workbook
import pandas as pd
from pandas import ExcelWriter

csv_folder = r'C:\Users\Me\Desktop\Test_Folder\\'

for fil in os.listdir(csv_folder):

    if '.xlsx' not in fil:
        continue
    else:
        pass

    df = pd.read_excel(csv_folder+fil, encoding = 'utf8')

    file_name = fil.replace('.xlsx','')

    writer = pd.ExcelWriter('condensed_output.xlsx', engine = 'xlsxwriter')
    df.to_excel(writer, sheet_name = file_name)
    writer.save()
    #writer.close()

Answer 1

确保 writer.save() 在循环之外。还要注意工作表名称的字符限制，因此如果文件名在某一点上相同，您也有可能以这种方式覆盖工作表名称。

import xlwt, csv, os
from openpyxl import load_workbook
import pandas as pd
from pandas import ExcelWriter

csv_folder = r'C:\Users\Me\Desktop\Test_Folder\\'
writer = pd.ExcelWriter('condensed_output.xlsx', engine = 'xlsxwriter')
for fil in os.listdir(csv_folder):

    if '.xlsx' not in fil:
        continue
    else:
        pass

    df = pd.read_excel(csv_folder+fil, encoding = 'utf8')

    file_name = fil.replace('.xlsx','')


    df.to_excel(writer, sheet_name = file_name) 

writer.save() #make sure this is outside of the loop. 

ETA:也在循环外建立编写器