how to execute F9 for excel spreadseet in python

how to execute F9 for excel spreadseet in python

I'm using python to execute some external command on excel.
x1 = win32com.client.DispatchEx("Excel.Application")
wb = x1.workbooks.open(filePath+fileName);
x1.run("fileName!someMacro")
results+=[(wb.ActiveSheet.Cells(4,8).Value,
wb.ActiveSheet.Cells(4,16).Value)];
And it is working, runs the macro and I can collect the results. I have
another sheet - there in Formulas bar I have a button "Calculate Now" / F9
I would like to run F9 and collect results from that sheet. But the
following code doesn't seems to executes F9 - thus I'm getting all the
results with same values.
results = []
sheet2=wb.Sheets(5).Select
for i in range(n):
wb.Sheets(5).Calculate
results+=[(wb.Sheets(5).Cells(12,11).Value,
wb.Sheets(5).Cells(12,10).Value];
How can I execute the F9 for excel from python?