获取AttributeError'Workbook'对象没有属性'add_worksheet'-将数据框写入Excel工作表时 [英] Getting AttributeError 'Workbook' object has no attribute 'add_worksheet' - while writing data frame to excel sheet

问题描述

我有以下代码，并尝试将数据帧写入Excel文件的现有"工作表中(此处称为test.xlsx). Sheet3是目标工作表，我想在其中放置数据，并且我不想用新的工作表替换整个工作表.

I have following code and trying to write a data frame into an "Existing" worksheet of an Excel file (referred here as test.xlsx). Sheet3 is the targeted sheet, where I want to place the data and I don't want to replace the entire sheet with a new one.

df = pd.DataFrame({'Data': [10, 20, 30, 20, 15, 30, 45]})
book = load_workbook('test.xlsx')
writer = pd.ExcelWriter('test.xlsx')
writer.book = book
writer.sheets = dict((ws.title, ws) for ws in book.worksheets) # *I am not sure what is happening in this line*
df.to_excel(writer,"Sheet3",startcol=0, startrow=20)

当我逐行运行代码时，我在最后一行遇到此错误:

When I am running the code line by line, I am getting this error for the last line:

AttributeError:工作簿"对象没有属性"add_worksheet".现在，当我不尝试添加工作表时为什么会看到此错误?

AttributeError: 'Workbook' object has no attribute 'add_worksheet'. Now why am I seeing this error when I am not trying to add worksheet ?

注意:我知道类似的问题

Note: I am aware of this similar issue Python How to use ExcelWriter to write into an existing worksheet but its not working for me and I can't comment on that post either.

推荐答案

以下是辅助函数:

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
    """
    from openpyxl import load_workbook

    # ignore [engine] parameter if it was passed
    if 'engine' in to_excel_kwargs:
        to_excel_kwargs.pop('engine')

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

    try:
        # try to open an existing workbook
        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

        # 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
        pass

    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()

用法:

append_df_to_excel('test.xlsx', df, sheet_name="Sheet3", startcol=0, startrow=20)

一些细节:

**to_excel_kwargs-用于将其他命名参数传递给df.to_excel()，就像我在上面的示例中所做的那样-append_df_to_excel()未知参数startcol，因此将其视为**to_excel_kwargs参数(词典)的一部分.

**to_excel_kwargs - used in order to pass additional named parameters to df.to_excel() like i did in the example above - parameter startcol is unknown to append_df_to_excel() so it will be treated as a part of **to_excel_kwargs parameter (dictionary).

writer.sheets = {ws.title:ws for ws in writer.book.worksheets}用于将现有工作表复制到writer openpyxl对象.我无法解释为什么在阅读writer = pd.ExcelWriter(filename, engine='openpyxl')时它不会自动完成-您应该向openpyxl模块的作者询问...

writer.sheets = {ws.title:ws for ws in writer.book.worksheets} is used in order to copy existing sheets to writer openpyxl object. I can't explain why it's not done automatically when reading writer = pd.ExcelWriter(filename, engine='openpyxl') - you should ask authors of openpyxl module about that...

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