pandas中利用groupby分組導入數據到excel中

import pandas as pd
df = pd.read_table(read_file, header=0, dtype=str, sep='\t')
res_file = fileDir + r'\filename.xlsx'
writer = pd.ExcelWriter(res_file)
groupby_df = df.groupby(['colname'])

for i in groupby_df:
    i[1].to_excel(writer, index=False, sheet_name=i[0])

writer.save()