diff --git a/pandas/_libs/reshape.pyx b/pandas/_libs/reshape.pyx
index e74b5919a4590..aed5e1d612088 100644
--- a/pandas/_libs/reshape.pyx
+++ b/pandas/_libs/reshape.pyx
@@ -36,7 +36,7 @@ ctypedef fused reshape_t:
 
 @cython.wraparound(False)
 @cython.boundscheck(False)
-def unstack(reshape_t[:, :] values, uint8_t[:] mask,
+def unstack(reshape_t[:, :] values, const uint8_t[:] mask,
             Py_ssize_t stride, Py_ssize_t length, Py_ssize_t width,
             reshape_t[:, :] new_values, uint8_t[:, :] new_mask):
     """
diff --git a/pandas/core/indexing.py b/pandas/core/indexing.py
index 22a44d65a947a..b74399ed86fbd 100644
--- a/pandas/core/indexing.py
+++ b/pandas/core/indexing.py
@@ -827,7 +827,7 @@ def _getitem_nested_tuple(self, tup: Tuple):
         # this is iterative
         obj = self.obj
         axis = 0
-        for i, key in enumerate(tup):
+        for key in tup:
 
             if com.is_null_slice(key):
                 axis += 1
@@ -1420,7 +1420,7 @@ def _is_scalar_access(self, key: Tuple) -> bool:
         if len(key) != self.ndim:
             return False
 
-        for i, k in enumerate(key):
+        for k in key:
             if not is_integer(k):
                 return False
 
@@ -2234,8 +2234,7 @@ def is_nested_tuple(tup, labels) -> bool:
     if not isinstance(tup, tuple):
         return False
 
-    for i, k in enumerate(tup):
-
+    for k in tup:
         if is_list_like(k) or isinstance(k, slice):
             return isinstance(labels, ABCMultiIndex)
 
diff --git a/pandas/core/internals/managers.py b/pandas/core/internals/managers.py
index f3b4ebad9cec1..d1293974b776a 100644
--- a/pandas/core/internals/managers.py
+++ b/pandas/core/internals/managers.py
@@ -48,8 +48,6 @@
     make_block,
 )
 
-from pandas.io.formats.printing import pprint_thing
-
 # TODO: flexible with index=None and/or items=None
 
 T = TypeVar("T", bound="BlockManager")
@@ -325,7 +323,7 @@ def __repr__(self) -> str:
                 output += f"\nAxis {i}: {ax}"
 
         for block in self.blocks:
-            output += f"\n{pprint_thing(block)}"
+            output += f"\n{block}"
         return output
 
     def _verify_integrity(self) -> None: