Support pylint 2.7.0 (#6726)

python-package/xgboost/core.py

@@ -1119,7 +1119,9 @@ class DeviceQuantileDMatrix(DMatrix):
             ctypes.byref(handle),
         )
         if it.exception is not None:
-            raise it.exception
+            #  pylint 2.7.0 believes `it.exception` can be None even with `assert
+            #  isinstace`
+            raise it.exception  # pylint: disable=raising-bad-type
         # delay check_call to throw intermediate exception first
         _check_call(ret)
         self.handle = handle
@@ -1315,7 +1317,7 @@ class Booster(object):
             self.handle,
             ctypes.byref(length),
             ctypes.byref(json_string)))
-        json_string = json_string.value.decode()  # NOLINT
+        json_string = json_string.value.decode()  # pylint: disable=no-member
         return json_string
 
     def load_config(self, config):
@@ -1508,7 +1510,7 @@ class Booster(object):
                                               dmats, evnames,
                                               c_bst_ulong(len(evals)),
                                               ctypes.byref(msg)))
-        res = msg.value.decode()  # NOLINT
+        res = msg.value.decode()  # pylint: disable=no-member
         if feval is not None:
             for dmat, evname in evals:
                 feval_ret = feval(self.predict(dmat, training=False,

python-package/xgboost/dask.py

@@ -712,7 +712,7 @@ def _create_dmatrix(
     T = TypeVar('T')
 
     def concat_or_none(data: Tuple[Optional[T], ...]) -> Optional[T]:
-        if any([part is None for part in data]):
+        if any(part is None for part in data):
             return None
         return concat(data)
 

python-package/xgboost/sklearn.py

@@ -293,14 +293,12 @@ def _wrap_evaluation_matrices(
         evals = list(zip(evals, eval_names))
     else:
         if any(
-            [
-                meta is not None
-                for meta in [
-                    sample_weight_eval_set,
-                    base_margin_eval_set,
-                    eval_group,
-                    eval_qid,
-                ]
+            meta is not None
+            for meta in [
+                sample_weight_eval_set,
+                base_margin_eval_set,
+                eval_group,
+                eval_qid,
             ]
         ):
             raise ValueError(