Fix mypy erroring on backport branches (#48240)

* Fix mypy erroring on backport branches

* Add comment

Author: phofl

doc/source/development/contributing_codebase.rst

@@ -265,7 +265,11 @@ pandas uses `mypy <http://mypy-lang.org>`_ and `pyright <https://github.com/micr
 
 .. code-block:: shell
 
-   pre-commit run --hook-stage manual --all-files
+    # the following might fail if the installed pandas version does not correspond to your local git version
+    pre-commit run --hook-stage manual --all-files
+
+    # if the above fails due to stubtest
+    SKIP=stubtest pre-commit run --hook-stage manual --all-files
 
 in your activated python environment. A recent version of ``numpy`` (>=1.22.0) is required for type validation.
 

scripts/run_stubtest.py

@@ -9,7 +9,7 @@
 import pandas as pd
 
 # fail early if pandas is not installed
-if "dev" not in getattr(pd, "__version__", ""):
+if not getattr(pd, "__version__", ""):
     # fail on the CI, soft fail during local development
     warnings.warn("You need to install the development version of pandas")
     if pd.compat.is_ci_environment():