histogram.py 文件源码

def get_left_bin_edge(self, bin_label):
        """Return left bin edge for a given bin index

        :param bin_label: bin label for which to find the left bin edge
        :returns: bin edge, can be float, int, timestamp
        """

        # check bin specifications and specified value
        if not self.bin_specs:
            return None
        bin_idx = np.int64(bin_label)
        if 'bin_edges' in self.bin_specs:
            bin_edges = self.bin_specs['bin_edges']
            if bin_idx < 0 or bin_idx >= len(bin_edges):
                raise RuntimeError('bin label "{}" does not fit in bin edges'.format(bin_label))
            bin_edge_left = bin_edges[bin_idx]
        else:
            width = self.bin_specs['bin_width']
            offset = self.bin_specs.get('bin_offset', 0.)
            # NOTE: this notation also works with timestamps!
            bin_edge_left = offset + (bin_idx * width)
        return bin_edge_left