我想編輯同一 Excel 文件中存在的多個工作表，然后保存所做的調整。這些工作表具有相同的列標題，稱為貸方和借方。我創建的代碼如下：import pandas as pdimport numpy as npclass blah:    def __init__(self, path, file_in, file_out):        self.path = path        self.file_inviato = file_in        self.file_out = file_out            def process_file(self):        df = pd.read_excel(self.path + self.file_in, sheet_name=None, skiprows=4)                      ****Here is where I am struggling in amending both worksheets at the same time****              #  df = df.columns.str.strip()       #  df['Col1'] = np.where((df['Col2'] == 'KO') | (df['Col2'] == 'OK'), 0, df['Col1'])                writer = pd.ExcelWriter(self.path + self.file_out, engine='xlsxwriter')                for sheet_name in df.keys():            df[sheet_name].to_excel(writer, sheet_name=sheet_name, index=False)                    writer.save()    b = blah('path....',         'file in....xlsx',         'file out.xlsx')b.process_file()