如何仅将值而不是公式复制到另一个工作簿中？(openpyxl)

from openpyxl import load_workbook
from openpyxl.utils import get_column_letter

# 打开源工作簿
source_workbook = load_workbook('source.xlsx')
source_sheet = source_workbook.active

# 创建目标工作簿
target_workbook = Workbook()
target_sheet = target_workbook.active

# 遍历源工作簿的单元格
for row in source_sheet.iter_rows():
    for cell in row:
        # 获取单元格的值
        value = cell.value
        
        # 获取单元格的位置
        column_letter = get_column_letter(cell.column)
        row_number = cell.row
        
        # 在目标工作簿中写入值
        target_sheet[column_letter + str(row_number)].value = value

# 保存目标工作簿
target_workbook.save('target.xlsx')