def sayhello():
    import __main__
    if hasattr(__main__, 'Globals'):
        workbook = __main__.Globals['workbook']
    else:
        workbook = __main__.workbook
        
    for col in range(10):
        for row in range(10):
            workbook['Sheet1'][col + 1, row + 1] = 'Hello World'
    print 'Hello World'