如何在python3中编写布局背景色代码？

import pandas as pd
 
 
def set_foramt():
  # 1.多个sheet页
  sheet_list = ['Sheet1', 'Sheet2', 'Sheet3', 'Sheet4', 'Sheet5']
  # 2.要写入的excel路径
  writer = pd.ExcelWriter('test_new.xlsx')
  workbook = writer.book
  # 3.循环遍历sheet取数据
  for sheet in sheet_list:
  df1 = pd.read_excel('test.xlsx', sheet_name=sheet)
 
  # 4.设置格式
  fmt = workbook.add_format({"font_name": u"微软雅黑"})
  percent_fmt = workbook.add_format({'num_format': '0.00%'})
  amt_fmt = workbook.add_format({'num_format': '#,##0.00'})
  border_format = workbook.add_format({'border': 1})
  bg_format = workbook.add_format({'bold': True, 'font_name': u'微软雅黑', 'bg_color': 'yellow',
   'align': 'center', 'valign': 'vcenter', 'font_color': 'black',
   'font_size': 10})
  date_fmt = workbook.add_format({'bold': False, 'font_name': u'微软雅黑', 'num_format': 'yyyy-mm-dd',
  'align': 'center', 'valign': 'vcenter'})
  # 5.写入excel
  l_end = len(df1.index) + 1
  df1.to_excel(writer, sheet_name=sheet, encoding='utf8', header=df1.columns.values.tolist(),
   index=False, startcol=0, startrow=0)
  worksheet1 = writer.sheets[sheet]
 
  # 6.生效单元格格式
  # 设置行高
  worksheet1.set_row(0, 20, fmt)  # 从第0行开始，行高为20，格式为fmt
  # 设置列宽
  worksheet1.set_column('A:F', 20, fmt)  # 从A列到F列，行高为10，格式为fmt
  # 加边框
  worksheet1.conditional_format(f'A1:F{l_end}', {'type': 'no_blanks', 'format': border_format})
  # A1单元格到F(索引值）, 'type': 'no_blanks'指非空的单元格加格式
  # 设置背景色
  worksheet1.conditional_format('A1:F1', {'type': 'no_blanks', 'format': bg_format})
  worksheet1.conditional_format(f'B2:B{l_end}', {'type': 'no_blanks', 'format': bg_format})
  # 合并日期单元格
  worksheet1.merge_range(f'A2:A{l_end}', df1['日期'][0], date_fmt)
  # 设置数值格式千分位，并保留两位小数
  worksheet1.conditional_format(f'C2:F{l_end}', {'type': 'no_blanks', 'format': amt_fmt})
  # 7.所有的sheet页设置好后再保存