Вылезает ошибка: AttributeError: 'tuple' object has no attribute 'value'

Вот код

from openpyxl import load_workbook

filename = input("Введите полный путь к файлу: ")
new_price = input("Введите полный путь к файлу с новым прайсом: ")

wb_form = load_workbook(filename = filename)
wb_form_new = load_workbook(filename = new_price)
wb_form_new_svodny = load_workbook(filename = 'D:/excel/Сводный.xlsx')

sheet_form = wb_form['Лист 1']
sheet_form_new = wb_form_new['Лист1']
sheet_form_new_svodny = wb_form_new_svodny['Лист1']

cell_letter = "" #Ячейка
row_number = 0 #Номер ряда

sheet_ranges = wb_form_new['Лист1']

column_a = sheet_ranges['A']
column_e = sheet_ranges['E']

i = 3

for i in range(len(column_a)): 
    fullcell = 'A' + str(i)
    my_name = sheet_form[fullcell]
    their_names = sheet_form_new[fullcell]
    sheet_form_new_svodny[fullcell] = str(my_name)
    sheet_form_new_svodny[fullcell].value
    if str(my_name) == str(their_names):
        my_price = sheet_form[fullcell].value
        their_price = sheet_form_new[fullcell].value
        if int(my_price) > int(their_price):
            sheet_form_new_svodny[fullcell] = str(their_price)
            sheet_form_new_svodny[fullcell].value