diff --git a/asv_bench/benchmarks/groupby.py b/asv_bench/benchmarks/groupby.py
index 0725bbeb6c36d..b51b41614bc49 100644
--- a/asv_bench/benchmarks/groupby.py
+++ b/asv_bench/benchmarks/groupby.py
@@ -142,7 +142,7 @@ def time_frame_nth(self, dtype):
     def time_series_nth_any(self, dtype):
         self.df['values'].groupby(self.df['key']).nth(0, dropna='any')
 
-    def time_groupby_nth_all(self, dtype):
+    def time_series_nth_all(self, dtype):
         self.df['values'].groupby(self.df['key']).nth(0, dropna='all')
 
     def time_series_nth(self, dtype):
diff --git a/pandas/_libs/internals.pyx b/pandas/_libs/internals.pyx
index 2179999859dbb..68698f45d5623 100644
--- a/pandas/_libs/internals.pyx
+++ b/pandas/_libs/internals.pyx
@@ -390,7 +390,7 @@ def get_blkno_indexers(int64_t[:] blknos, bint group=True):
     start = 0
     cur_blkno = blknos[start]
 
-    if group == False:
+    if group is False:
         for i in range(1, n):
             if blknos[i] != cur_blkno:
                 yield cur_blkno, slice(start, i)
diff --git a/pandas/core/indexes/period.py b/pandas/core/indexes/period.py
index 4d8e57820f29d..c5cb507e729f1 100644
--- a/pandas/core/indexes/period.py
+++ b/pandas/core/indexes/period.py
@@ -315,7 +315,6 @@ def __contains__(self, key):
                 return True
             except Exception:
                 return False
-            return False
 
     contains = __contains__