一段excel导出信息到word的代码，为什么会信息替换不全？

wenclick

from docx import Document
import xlrd


def change_text(old_text, new_text):
    all_paragraphs = document.paragraphs
    for paragraph in all_paragraphs:
        for run in paragraph.runs:
            run_text = run.text.replace(old_text, new_text)
            run.text = run_text

    all_tables = document.tables
    for table in all_tables:
        for row in table.rows:
            for cell in row.cells:
                cell_text = cell.text.replace(old_text, new_text)
                cell.text = cell_text


xlsx = xlrd.open_workbook('表格.xlsx')
sheet = xlsx.sheet_by_index(0)

for table_row in range(1, sheet.nrows):
    document = Document("模版.docx")
    for table_col in range(0, sheet.ncols):
        change_text(str(sheet.cell_value(0, table_col)), str(sheet.cell_value(table_row, table_col)))

        document.save("%s表.docx" % str(sheet.cell_value(table_row, 0)))
        print("%s表完成" % str(sheet.cell_value(table_row, 0)))



程序能顺利运行，但是信息经常导出替换不全，excel和word换一下标记有时又可以了，求帮忙改进一下