Safely handle excel instances in windows

excelhandler.py

import win32com.client as win32

file_path = 'C:\\File.xlsx'
already_open = False

# Open excel application and template workbook
xl = win32.gencache.EnsureDispatch("Excel.Application")

# Check to see if a workbook is already open
if len(xl.Workbooks) > 0:
    already_open = True
    xl.Visible = False

try:
    wb = xl.Workbooks.Open(file_path)

    # Use workbook as needed ...

    wb.Close()
except:
    print 'Error opening file'
finally:
    if already_open:
        # Since it was already open, make it visible again so you don't close out other workbooks
        xl.Visible = True
    else:
        # Quit excel since there are no other workbooks open
        xl.Application.Quit()