diff --git a/doc/whats-new.rst b/doc/whats-new.rst
index 051a41a57e5..1993e543322 100644
--- a/doc/whats-new.rst
+++ b/doc/whats-new.rst
@@ -129,6 +129,10 @@ Internal Changes
 - Use ``async`` / ``await`` for the asynchronous distributed
   tests. (:issue:`3987`, :pull:`3989`)
   By `Justus Magin <https://github.com/keewis>`_.
+- Remove unnecessary comprehensions becuase the built-in functions like
+  ``all``, ``any``, ``enumerate``, ``sum``, ``tuple`` etc. can work directly with a
+  generator expression. (:pull:`4026`)
+  By `Prajjwal Nijhara <https://github.com/pnijhara>`_.
 
 .. _whats-new.0.15.1:
 
diff --git a/xarray/core/groupby.py b/xarray/core/groupby.py
index 148e16863d1..85dd735c2fe 100644
--- a/xarray/core/groupby.py
+++ b/xarray/core/groupby.py
@@ -29,7 +29,7 @@ def check_reduce_dims(reduce_dims, dimensions):
     if reduce_dims is not ...:
         if is_scalar(reduce_dims):
             reduce_dims = [reduce_dims]
-        if any([dim not in dimensions for dim in reduce_dims]):
+        if any(dim not in dimensions for dim in reduce_dims):
             raise ValueError(
                 "cannot reduce over dimensions %r. expected either '...' to reduce over all dimensions or one or more of %r."
                 % (reduce_dims, dimensions)
diff --git a/xarray/core/pdcompat.py b/xarray/core/pdcompat.py
index f2e4518e0dc..f2e22329fc8 100644
--- a/xarray/core/pdcompat.py
+++ b/xarray/core/pdcompat.py
@@ -55,4 +55,4 @@ def count_not_none(*args) -> int:
 
     Copied from pandas.core.common.count_not_none (not part of the public API)
     """
-    return sum([arg is not None for arg in args])
+    return sum(arg is not None for arg in args)
diff --git a/xarray/core/variable.py b/xarray/core/variable.py
index 68e823ca426..e19132b1b06 100644
--- a/xarray/core/variable.py
+++ b/xarray/core/variable.py
@@ -2412,7 +2412,7 @@ def assert_unique_multiindex_level_names(variables):
 
     duplicate_names = [v for v in level_names.values() if len(v) > 1]
     if duplicate_names:
-        conflict_str = "\n".join([", ".join(v) for v in duplicate_names])
+        conflict_str = "\n".join(", ".join(v) for v in duplicate_names)
         raise ValueError("conflicting MultiIndex level name(s):\n%s" % conflict_str)
     # Check confliction between level names and dimensions GH:2299
     for k, v in variables.items():