使用 Pandas 更新 excel 表而不覆盖文件

Question

我正在尝试使用 Python 代码更新 Excel 工作表。我阅读了特定的单元格并进行了相应的更新，但 Padadas 覆盖了整个 excelsheet，我丢失了其他页面以及格式。谁能告诉我如何避免它？

       Record = pd.read_excel("Myfile.xlsx", sheet_name'Sheet1', index_col=False)
       Record.loc[1, 'WORDS'] = int(self.New_Word_box.get())
       Record.loc[1, 'STATUS'] = self.Stat.get()
       Record.to_excel("Myfile.xlsx", sheet_name='Student_Data', index =False)

我的代码在上面，如您所见，我只想更新几个单元格，但它会覆盖整个 excel 文件。我试图寻找答案，但找不到任何具体的答案。

感谢您的帮助。

Answer 1

更新：添加了更多说明

步骤：

1) 阅读需要在数据框中更改的工作表并在该数据框中进行更改。

2) 现在更改会反映在数据框中，但不会反映在工作表中。将以下函数与步骤 1 中的数据框和要修改的工作表的名称一起使用。您将使用 truncate_sheet 参数来完全替换关注的工作表。 函数调用是这样的：

append_df_to_excel(filename, df, sheet_name, startrow=0, truncate_sheet=True)

from openpyxl import load_workbook
import pandas as pd

def append_df_to_excel(filename, df, sheet_name="Sheet1", startrow=None,
                       truncate_sheet=False,
                       **to_excel_kwargs):
    """
    Append a DataFrame [df] to existing Excel file [filename]
    into [sheet_name] Sheet.
    If [filename] doesn"t exist, then this function will create it.

    Parameters:
      filename : File path or existing ExcelWriter
                 (Example: "/path/to/file.xlsx")
      df : dataframe to save to workbook
      sheet_name : Name of sheet which will contain DataFrame.
                   (default: "Sheet1")
      startrow : upper left cell row to dump data frame.
                 Per default (startrow=None) calculate the last row
                 in the existing DF and write to the next row...
      truncate_sheet : truncate (remove and recreate) [sheet_name]
                       before writing DataFrame to Excel file
      to_excel_kwargs : arguments which will be passed to `DataFrame.to_excel()`
                        [can be dictionary]

    Returns: None
    """
    # ignore [engine] parameter if it was passed
    if "engine" in to_excel_kwargs:
        to_excel_kwargs.pop("engine")

    writer = pd.ExcelWriter(filename, engine="openpyxl")

    # Python 2.x: define [FileNotFoundError] exception if it doesn"t exist
    try:
        FileNotFoundError
    except NameError:
        FileNotFoundError = IOError

    if "index" not in to_excel_kwargs:
        to_excel_kwargs["index"] = False

    try:
        # try to open an existing workbook
        if "header" not in to_excel_kwargs:
            to_excel_kwargs["header"] = True
        writer.book = load_workbook(filename)

        # get the last row in the existing Excel sheet
        # if it was not specified explicitly
        if startrow is None and sheet_name in writer.book.sheetnames:
            startrow = writer.book[sheet_name].max_row
            to_excel_kwargs["header"] = False

        # truncate sheet
        if truncate_sheet and sheet_name in writer.book.sheetnames:
            # index of [sheet_name] sheet
            idx = writer.book.sheetnames.index(sheet_name)
            # remove [sheet_name]
            writer.book.remove(writer.book.worksheets[idx])
            # create an empty sheet [sheet_name] using old index
            writer.book.create_sheet(sheet_name, idx)

        # copy existing sheets
        writer.sheets = {ws.title: ws for ws in writer.book.worksheets}
    except FileNotFoundError:
        # file does not exist yet, we will create it
        to_excel_kwargs["header"] = True

    if startrow is None:
        startrow = 0

    # write out the new sheet
    df.to_excel(writer, sheet_name, startrow=startrow, **to_excel_kwargs)

    # save the workbook
    writer.save()

我们不能在这里替换 openpyxl 引擎来编写评论中要求的 excel 文件。参考参考2。

参考资料：

1) https://stackoverflow.com/a/38075046/6741053

2) xlsxwriter: is there a way to open an existing worksheet in my workbook?