diff --git a/pandas/core/apply.py b/pandas/core/apply.py
index 61d093d19e4be..d093d7a145382 100644
--- a/pandas/core/apply.py
+++ b/pandas/core/apply.py
@@ -342,7 +342,7 @@ def wrap_results(self):
         results = self.results
 
         # see if we can infer the results
-        if len(results) > 0 and is_sequence(results[0]):
+        if len(results) > 0 and 0 in results and is_sequence(results[0]):
 
             return self.wrap_results_for_axis()
 
diff --git a/pandas/core/indexes/base.py b/pandas/core/indexes/base.py
index 62662edb692a7..8aff0bc19d68d 100644
--- a/pandas/core/indexes/base.py
+++ b/pandas/core/indexes/base.py
@@ -2588,8 +2588,9 @@ def intersection(self, other, sort=False):
         try:
             indexer = Index(rvals).get_indexer(lvals)
             indexer = indexer.take((indexer != -1).nonzero()[0])
-        except Exception:
-            # duplicates
+        except (InvalidIndexError, IncompatibleFrequency):
+            # InvalidIndexError raised by get_indexer if non-unique
+            # IncompatibleFrequency raised by PeriodIndex.get_indexer
             indexer = algos.unique1d(Index(rvals).get_indexer_non_unique(lvals)[0])
             indexer = indexer[indexer != -1]
 
diff --git a/pandas/io/sql.py b/pandas/io/sql.py
index 44cb399336d62..b0683fb8b0dfb 100644
--- a/pandas/io/sql.py
+++ b/pandas/io/sql.py
@@ -1591,10 +1591,7 @@ def execute(self, *args, **kwargs):
         else:
             cur = self.con.cursor()
         try:
-            if kwargs:
-                cur.execute(*args, **kwargs)
-            else:
-                cur.execute(*args)
+            cur.execute(*args, **kwargs)
             return cur
         except Exception as exc:
             try:
diff --git a/pandas/io/stata.py b/pandas/io/stata.py
index c67106e897727..0b674b556b2ee 100644
--- a/pandas/io/stata.py
+++ b/pandas/io/stata.py
@@ -2388,16 +2388,16 @@ def write_file(self):
             self._write_map()
         except Exception as exc:
             self._close()
-            try:
-                if self._own_file:
+            if self._own_file:
+                try:
                     os.unlink(self._fname)
-            except Exception:
-                warnings.warn(
-                    "This save was not successful but {0} could not "
-                    "be deleted.  This file is not "
-                    "valid.".format(self._fname),
-                    ResourceWarning,
-                )
+                except OSError:
+                    warnings.warn(
+                        "This save was not successful but {0} could not "
+                        "be deleted.  This file is not "
+                        "valid.".format(self._fname),
+                        ResourceWarning,
+                    )
             raise exc
         else:
             self._close()