Return the minimum value in this histogram.

        If there are no values in the histogram at all, return 10.

        Returns:
            int: The minimum value in the histogram.

def min(self):
        """Return the minimum value in this histogram.

        If there are no values in the histogram at all, return 10.

        Returns:
            int: The minimum value in the histogram.
        """
        if len(self._data) == 0:
            return 10
        return next(iter(sorted(self._data.keys())))