core.py 文件源码

def __getitem__(self, key):
        if isinstance(key, str) and key in self.columns:
            meta = self._meta[key]
            name = 'getitem-%s' % tokenize(self, key)
            dsk = {(name, i): (operator.getitem, (self._name, i), key)
                   for i in range(self.npartitions)}
            return Series(merge(self.dask, dsk), name, meta, self.divisions)

        raise NotImplementedError("Indexing with %r" % key)