import formulas
from openpyxl.reader.excel import load_workbook

fpath = "Book1.xlsx"
wb = load_workbook(filename=fpath)
ws = wb.worksheets[0]

xl_model = formulas.ExcelModel().loads(fpath).finish()
xl_model.calculate()
ws_dict = xl_model.write()['BOOK1.XLSX']
wb = list(ws_dict.values())[0]
wb.save(fpath)