[Python] Save changes with openpyxl

I am new to python and an using openpyxl to edit an xlsx file. I am having an issue trying to save the original file. It seems that openpyxl keeps making me save the changes as a new xlsx.

Here is the code I am using and get the error TypeError: save() takes exactly 2 arguments (1 given)

import openpyxl
from openpyxl import Workbook
wb = openpyxl.load_workbook('book1.xlsx')
sheet = wb.get_sheet_by_name("Sensor Status")
sheet['I3'] = '=countifs(B:B,"*server*",C:C,"=0")'
sheet['I4'] = '=countifs(B:B,"*server*",C:C,">=0")'
wb.save()

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