average mean

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    """Find mean of a list of numbers."""
    
    
    def average(nums):
        """Find mean of a list of numbers."""
        return sum(nums) / len(nums)
    
    
    def test_average():
        """
        >>> test_average()
        """
        assert 12.0 == average([3, 6, 9, 12, 15, 18, 21])
        assert 20 == average([5, 10, 15, 20, 25, 30, 35])
        assert 4.5 == average([1, 2, 3, 4, 5, 6, 7, 8])
    
    
    if __name__ == "__main__":
        """Call average module to find mean of a specific list of numbers."""
        print(average([2, 4, 6, 8, 20, 50, 70]))