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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 import_from_string(value):
 """Copy of rest_framework.settings.import_from_string"""

    value = value.replace('-', '_')
    try:
        module_path, class_name = value.rsplit('.', 1)
        module = import_module(module_path)
        return getattr(module, class_name)
    except (ImportError, AttributeError) as ex:
        raise ImportError("Could not import '{}'. {}: {}.".format(
            value, ex.__class__.__name__, ex))