Generator for groupby reductions

.pre-commit-config.yaml

@@ -20,6 +20,7 @@ repos:
     rev: v0.3.4
     hooks:
       - id: blackdoc
+        exclude: "generate_reductions.py"
   - repo: https://gitlab.com/pycqa/flake8
     rev: 3.9.2
     hooks:

doc/whats-new.rst

@@ -86,6 +86,8 @@ Documentation
 
 - Users are instructed to try ``use_cftime=True`` if a ``TypeError`` occurs when combining datasets and one of the types involved is a subclass of ``cftime.datetime`` (:pull:`5776`).
   By `Zeb Nicholls <https://github.com/znicholls>`_.
+- Better examples in docstrings for groupby and resampling reductions.
+  By `Deepak Cherian <https://github.com/dcherian>`_.
 
 Internal Changes
 ~~~~~~~~~~~~~~~~