如何使用Pandas将数据写入Excel中的现有文件？

import pandas as pd
from openpyxl import load_workbook

excel_file = 'path/to/existing_file.xlsx'
book = load_workbook(excel_file)
writer = pd.ExcelWriter(excel_file, engine='openpyxl')
writer.book = book

data = {'列1': [1, 2, 3, 4, 5],
        '列2': ['A', 'B', 'C', 'D', 'E']}
df = pd.DataFrame(data)

sheet_name = 'Sheet1'  # 指定要写入的工作表名称
df.to_excel(writer, sheet_name=sheet_name, index=False, startrow=writer.sheets[sheet_name].max_row, header=False)

writer.save()
writer.close()