From 457e48c694c721af6628284b83ed7d64f36598a3 Mon Sep 17 00:00:00 2001
From: MomIsBestFriend <>
Date: Tue, 3 Dec 2019 23:16:28 +0200
Subject: [PATCH 1/2] DOC: Raises `KeyError`

---
 pandas/compat/chainmap.py | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/pandas/compat/chainmap.py b/pandas/compat/chainmap.py
index 84824207de2a9..458b27684ec1a 100644
--- a/pandas/compat/chainmap.py
+++ b/pandas/compat/chainmap.py
@@ -6,12 +6,18 @@ def __setitem__(self, key, value):
         for mapping in self.maps:
             if key in mapping:
                 mapping[key] = value
-                return
+                break
         self.maps[0][key] = value
 
     def __delitem__(self, key):
+        """
+        Raises
+        ------
+        KeyError
+            If `key` doesn't exist.
+        """
         for mapping in self.maps:
             if key in mapping:
                 del mapping[key]
-                return
+                break
         raise KeyError(key)

From c5d7438c85ef8a58b7d4430478bc88a01105434a Mon Sep 17 00:00:00 2001
From: MomIsBestFriend <>
Date: Wed, 4 Dec 2019 09:51:32 +0200
Subject: [PATCH 2/2] DOC: Raises `KeyError`

---
 pandas/compat/chainmap.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/pandas/compat/chainmap.py b/pandas/compat/chainmap.py
index 458b27684ec1a..479eddf0c0536 100644
--- a/pandas/compat/chainmap.py
+++ b/pandas/compat/chainmap.py
@@ -6,7 +6,7 @@ def __setitem__(self, key, value):
         for mapping in self.maps:
             if key in mapping:
                 mapping[key] = value
-                break
+                return
         self.maps[0][key] = value
 
     def __delitem__(self, key):
@@ -19,5 +19,5 @@ def __delitem__(self, key):
         for mapping in self.maps:
             if key in mapping:
                 del mapping[key]
-                break
+                return
         raise KeyError(key)