[Python] Running Python script from VBA nothing happens, but when I run it from python.exe, it...

I'm running Python scrpit from VBA. The result should be a filled cell in Exel file. I tried using this VBA command:

RetVal = Shell("""C:\Python27\python.exe""" & " " & """M:\Analysis\PythonScripts\MySript.py""", vbHide)


But nothing happens as the result. However, if I run this scipt from python.exe directly, it works fine. The cell in Excel file is filled with a value. Which brings me to conclusion that something is wrong with VBA code.

Update

Fragment of Python Script:

ExcelApp = win32com.client.GetActiveObject("Excel.Application")
wb = ExcelApp.Workbooks('File1.xlsm')
sheet = wb.Worksheets(u'Result')
cell = sheet.Range('B1')
cell.Value = result

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