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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 earthquake_fatality_rate(hazard_level):
 """Earthquake fatality ratio for a given hazard level. It reads the QGIS QSettings to know what is the default earthquake function. :param hazard_level: The hazard level. :type hazard_level: int :return: The fatality rate. :rtype: float """

    earthquake_function = setting(
        'earthquake_function', EARTHQUAKE_FUNCTIONS[0]['key'], str)
    ratio = 0
    for model in EARTHQUAKE_FUNCTIONS:
        if model['key'] == earthquake_function:
            eq_function = model['fatality_rates']
            ratio = eq_function().get(hazard_level)
    return ratio