xr_accessor.py 文件源码

def _set_snapshot_clock(self, dim, data=None, start=0., end=None,
                            step=None, nsteps=None, auto_adjust=True):
        if self.master_clock_dim is None:
            raise ValueError("no master clock dimension/coordinate is defined "
                             "in Dataset. "
                             "Use `Dataset.xsimlab._set_master_clock` first")

        clock_data = self._set_clock_data(dim, data, start, end, step, nsteps)

        da_master_clock = self._obj[self.master_clock_dim]

        if auto_adjust:
            kwargs = {'method': 'nearest'}
        else:
            kwargs = {}

        indexer = {self.master_clock_dim: clock_data}
        kwargs.update(indexer)
        da_snapshot_clock = da_master_clock.sel(**kwargs)

        self._obj[dim] = da_snapshot_clock.rename({self.master_clock_dim: dim})
        # .sel copies variable attributes
        self._obj[dim].attrs.pop(self._master_clock_key)

        for attr_name in ('units', 'calendar'):
            attr_value = da_master_clock.attrs.get(attr_name)
            if attr_value is not None:
                self._obj[dim].attrs[attr_name] = attr_value