From 203364bd2b930102d9c2f80c998acd151e75d149 Mon Sep 17 00:00:00 2001
From: jbrockmendel <jbrockmendel@gmail.com>
Date: Tue, 22 Oct 2019 08:38:07 -0700
Subject: [PATCH] Stop catching TypeError in _aggregate_item_by_item

---
 pandas/core/dtypes/cast.py     |  2 +-
 pandas/core/groupby/generic.py | 11 ++++-------
 2 files changed, 5 insertions(+), 8 deletions(-)

diff --git a/pandas/core/dtypes/cast.py b/pandas/core/dtypes/cast.py
index dd001e78c07de..7fcaf60088ad2 100644
--- a/pandas/core/dtypes/cast.py
+++ b/pandas/core/dtypes/cast.py
@@ -202,7 +202,7 @@ def trans(x):
         r = result.ravel()
         arr = np.array([r[0]])
 
-        if isna(arr).any() or not np.allclose(arr, trans(arr).astype(dtype), rtol=0):
+        if isna(arr).any():
             # if we have any nulls, then we are done
             return result
 
diff --git a/pandas/core/groupby/generic.py b/pandas/core/groupby/generic.py
index a78857423e7e0..08c84f284737c 100644
--- a/pandas/core/groupby/generic.py
+++ b/pandas/core/groupby/generic.py
@@ -1098,10 +1098,7 @@ def _aggregate_item_by_item(self, func, *args, **kwargs):
 
             cast = self._transform_should_cast(func)
             try:
-
                 result[item] = colg.aggregate(func, *args, **kwargs)
-                if cast:
-                    result[item] = self._try_cast(result[item], data)
 
             except ValueError as err:
                 if "Must produce aggregated value" in str(err):
@@ -1110,10 +1107,10 @@ def _aggregate_item_by_item(self, func, *args, **kwargs):
                     raise
                 cannot_agg.append(item)
                 continue
-            except TypeError as e:
-                cannot_agg.append(item)
-                errors = e
-                continue
+
+            else:
+                if cast:
+                    result[item] = self._try_cast(result[item], data)
 
         result_columns = obj.columns
         if cannot_agg: