我想让我的 excel 文件用 openpyxl 快速读写

Question

my code is to slow I want to make is more faster for example: the code is supposed to take the value of in cell a1 and change its value and rewrite again in the same cell can you help me with it?

import openpyxl

row = 1
counter = 0
while row <= 20980:
    book = openpyxl.load_workbook('semsar_full.xlsx')
    sheet = book.active
    a3 = sheet.cell(row=row, column=1)
    a4 = a3.value + ':::'
    sheet.cell(row=row, column=1, value=a4)
    counter += 1
    row += 1
    print(counter)
    book.save('semsar_full.xlsx')

Answer 1

I think the biggest issue while it is very slow is that you are loading + saving the file for each row contained. If you put the load + save outside of the loop the code should be much faster.

import openpyxl

book = openpyxl.load_workbook('semsar_full.xlsx')
sheet = book.active
row = 1
counter = 0
while row <= 20980:

    a3 = sheet.cell(row=row, column=1)
    a4 = a3.value + ':::'
    sheet.cell(row=row, column=1, value=a4)
    counter += 1
    row += 1
    print(counter)

book.save('semsar_full.xlsx')