New Py_Course - 81 - Project 1: Automation with Python (2) - but "cleaner" code.

import openpyxl as xl
from openpyxl.chart import BarChart, Reference


def process_workbook(filename):
    wb = xl.load_workbook(filename)
    sheet = wb["Sheet1"]
    
    for row in range(2, sheet.max_row + 1):
        cell = sheet.cell(row, 3)
        corrected_price = cell.value * 0.9
        corrected_price_cell = sheet.cell(row, 4)
        corrected_price_cell.value = corrected_price
    
    values = Reference(sheet, min_row=2, max_row=sheet.max_row, min_col=4, max_col=4)
    
    chart = BarChart()
    chart.add_data(values)
    sheet.add_chart(chart, "e2")
    
    wb.save(filename)