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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _extractNVMLErrorsAsClasses():
 """ Generates a hierarchy of classes on top of NVMLError class. Each NVML Error gets a new NVMLError subclass. This way try,except blocks can filter appropriate exceptions more easily. NVMLError is a parent class. Each NVML_ERROR_* gets it's own subclass. e.g. NVML_ERROR_ALREADY_INITIALIZED will be turned into NVMLError_AlreadyInitialized """

    this_module = sys.modules[__name__]
    nvmlErrorsNames = [x for x in dir(this_module) if x.startswith("NVML_ERROR_")]
    for err_name in nvmlErrorsNames:
        # e.g. Turn NVML_ERROR_ALREADY_INITIALIZED into NVMLError_AlreadyInitialized
        class_name = "NVMLError_" + string.capwords(err_name.replace("NVML_ERROR_", ""), "_").replace("_", "")
        err_val = getattr(this_module, err_name)
        def gen_new(val):
            def new(typ):
                obj = NVMLError.__new__(typ, val)
                return obj
            return new
        new_error_class = type(class_name, (NVMLError,), {'__new__': gen_new(err_val)})
        new_error_class.__module__ = __name__
        setattr(this_module, class_name, new_error_class)
        NVMLError._valClassMapping[err_val] = new_error_class