如何手动打开Python同时写入的文件？

Question

我有一个python代码，该代码执行一些计算，然后按如下所示将输出写入excel工作表-

#  import the necessary packages
import numpy as np
import argparse
import time
import cv2
import os
from openpyxl import load_workbook
import pandas as pd
from datetime import date, datetime

filename = r'PathToDirectory\Data.xlsx'

def append_df_to_excel(filename, df, sheet_name='Sheet1', startrow=None,
                       truncate_sheet=False, 
                       **to_excel_kwargs):

    # 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

    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, header = False, index=False)

    # save the workbook
    writer.save()


while(True):

#    --------------------------------------------------------------
#    -----------REST OF THE CODE AND COMPUTATION HERE--------------
#    --------------------------------------------------------------

    today = date.today()
    today = today.strftime("%d/%m/%Y")
    now = datetime.now()
    now = now.strftime("%H:%M:%S")
    rec_classes = list(set(classIDs))
    for counting in range(len(rec_classes)):
        my_label = LABELS[rec_classes[counting]]
        my_count = classIDs.count(rec_classes[counting])
        data_dict = ({'today_date' : [today], 'now_time' : [now], 'animal_class' : [my_label], 'animal_count' : my_count})
        df = pd.DataFrame(data_dict)
        append_df_to_excel(filename, df)

如果我想写到Excel工作表，代码运行良好，并且在代码运行后，我可以打开文件，所有内容都能完美显示。

问题是我想在运行时打开excel文件。我想在代码运行时看到要添加的行和要追加的数据。但是，每当我在代码运行时打开excel文件时，都会出现“权限被拒绝”错误，并且代码停止。我尝试使用OSError pass除外解决它，但没有帮助。

有什么可以做的吗？

Answer 1

没有，没有直接方法让Excel动态更新其更改文件的显示。它从磁盘一次加载到内存中，然后Excel忽略磁盘文件。

（（如果您编写了一个Excel宏来定期重新访问该文件，也许您可​​以完成此操作。但是，无论如何，朋友都不允许朋友使用Excel。）