如何将特定的列从dataframe写入excel？

import pandas as pd

# 创建一个示例DataFrame
data = {
    'A': [1, 2, 3],
    'B': [4, 5, 6],
    'C': [7, 8, 9]
}
df = pd.DataFrame(data)

# 指定要写入Excel的列
columns_to_write = ['A', 'C']

# 将指定的列写入Excel文件
with pd.ExcelWriter('output.xlsx', engine='openpyxl') as writer:
    df[columns_to_write].to_excel(writer, index=False, sheet_name='Sheet1')

df[columns_to_write].to_excel(writer, index=False, sheet_name='Sheet1', encoding='utf-8')

with pd.ExcelWriter('output.xlsx', engine='openpyxl') as writer:
    df[columns_to_write].to_excel(writer, index=False, sheet_name='Sheet1', chunksize=1000)

from openpyxl import Workbook

wb = Workbook()
ws = wb.active
for r in dataframe_to_rows(df[columns_to_write], index=False, header=True):
    ws.append(r)
wb.save('output.xlsx')