class MyCustomError(Exception):
    def __init__(self, *args):
        if args:
            self.message = args[0]
        else:
            self.message = None
    def __str__(self):
        print('calling str')
        if self.message:
            return 'MyCustomError, {0} '.format(self.message)
        else:
            return 'MyCustomError has been raised'
# выдача MyCustomError
raise MyCustomError('We have a problem')

# Создаем словарь, значениями которого могут служить только числа типов int и float
class IntFloatValueError(Exception):
    def __init__(self, value):
        self.value = value
    def __str__(self):
        return '{} is invalid input, CustomIntFloatDict can only accept ' \
               'integers and floats as its values'.format(self.value)
class KeyValueContructError(Exception):
    def __init__(self, key, value):
        self.key = key
        self.value = value
    def __str__(self):
        return 'keys and values need to be passed as either list or tuple' + '\n' + \
                ' {} is of type: '.format(self.key) + str(type(self.key)) + '\n' + \
                ' {} is of type: '.format(self.value) + str(type(self.value))
class CustomIntFloatDict(dict):
    empty_dict = {}
    def __init__(self, key=None, value=None):
        if key is None or value is None:
            self.get_dict()
        elif not isinstance(key, (tuple, list,)) or not isinstance(value, (tuple, list)):
            raise KeyValueContructError(key, value)
        else:
            zipped = zip(key, value)
            for k, val in zipped:
                if not isinstance(val, (int, float)):
                    raise IntFloatValueError(val)
                dict.__setitem__(self, k, val)
    def get_dict(self):
        return self.empty_dict
    def __setitem__(self, key, value):
        if not isinstance(value, (int, float)):
            raise IntFloatValueError(value)
        return dict.__setitem__(self, key, value)
# тестирование
# test_1 = CustomIntFloatDict()
# print(test_1)
# test_2 = CustomIntFloatDict({'a', 'b'}, [1, 2])
# print(test_2)
# test_3 = CustomIntFloatDict(('x', 'y', 'z'), (10, 'twenty', 30))
# print(test_3)
# test_4 = CustomIntFloatDict(('x', 'y', 'z'), (10, 20, 30))
# print(test_4)
# test_4['r'] = 1.3
# print(test_4)
# test_4['key'] = 'bad_value'