Generator for groupby reductions (#5871)

Co-authored-by: Maximilian Roos <[email protected]>
Co-authored-by: Maximilian Roos <[email protected]>

Author: dcherian

.pre-commit-config.yaml

@@ -21,6 +21,7 @@ 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

@@ -39,6 +39,11 @@ Bug fixes
 Documentation
 ~~~~~~~~~~~~~
 
+- Better examples in docstrings for groupby and resampling reductions (:pull:`5871`).
+  By `Deepak Cherian <https://github.com/dcherian>`_,
+  `Maximilian Roos <https://github.com/max-sixty>`_,
+  `Jimmy Westling <https://github.com/illviljan>`_ .
+
 
 Internal Changes
 ~~~~~~~~~~~~~~~~