From a2f542ed9052422abe8311d678cfa2171b718c97 Mon Sep 17 00:00:00 2001
From: Christian Clauss <cclauss@me.com>
Date: Sun, 31 May 2020 10:47:09 +0200
Subject: [PATCH 1/4] doubly_linked_list.py: Add doctests

---
 data_structures/linked_list/doubly_linked_list.py | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/data_structures/linked_list/doubly_linked_list.py b/data_structures/linked_list/doubly_linked_list.py
index e449ed6ec8ac..f3266d7d1328 100644
--- a/data_structures/linked_list/doubly_linked_list.py
+++ b/data_structures/linked_list/doubly_linked_list.py
@@ -10,6 +10,18 @@
 
 
 class LinkedList:  # making main class named linked list
+    """
+    >>> linked_list = LinkedList()
+    >>> linked_list.insert_head("a")
+    >>> linked_list.insert_tail("b")
+    >>> _ = linked_list.delete_tail()
+    >>> linked_list.isEmpty()
+    True
+    >>> linked_list.delete_head()
+    None
+    >>> linked_list.isEmpty()
+    False
+    """
     def __init__(self):
         self.head = None
         self.tail = None

From 1e2bbeb5d8da018eae8fc9239c85d1f2fb969c90 Mon Sep 17 00:00:00 2001
From: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>
Date: Sun, 31 May 2020 08:47:49 +0000
Subject: [PATCH 2/4] fixup! Format Python code with psf/black push

---
 data_structures/linked_list/doubly_linked_list.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/data_structures/linked_list/doubly_linked_list.py b/data_structures/linked_list/doubly_linked_list.py
index f3266d7d1328..9996dfd02e37 100644
--- a/data_structures/linked_list/doubly_linked_list.py
+++ b/data_structures/linked_list/doubly_linked_list.py
@@ -22,6 +22,7 @@ class LinkedList:  # making main class named linked list
     >>> linked_list.isEmpty()
     False
     """
+
     def __init__(self):
         self.head = None
         self.tail = None

From db9be4fc83ebb9f3b3540fe110f96d2be1696c1f Mon Sep 17 00:00:00 2001
From: Christian Clauss <cclauss@me.com>
Date: Sun, 31 May 2020 14:18:03 +0200
Subject: [PATCH 3/4] Update doubly_linked_list.py

---
 data_structures/linked_list/doubly_linked_list.py | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/data_structures/linked_list/doubly_linked_list.py b/data_structures/linked_list/doubly_linked_list.py
index 9996dfd02e37..f15ec2cbdc78 100644
--- a/data_structures/linked_list/doubly_linked_list.py
+++ b/data_structures/linked_list/doubly_linked_list.py
@@ -12,12 +12,12 @@
 class LinkedList:  # making main class named linked list
     """
     >>> linked_list = LinkedList()
-    >>> linked_list.insert_head("a")
-    >>> linked_list.insert_tail("b")
-    >>> _ = linked_list.delete_tail()
+    >>> linked_list.insertHead("a")
+    >>> linked_list.insertTail("b")
+    >>> _ = linked_list.deleteTail()
     >>> linked_list.isEmpty()
     True
-    >>> linked_list.delete_head()
+    >>> linked_list.deleteHead()
     None
     >>> linked_list.isEmpty()
     False

From 73b166fcdaf4f2d3881e1cb89b9ec75539e738ce Mon Sep 17 00:00:00 2001
From: Christian Clauss <cclauss@me.com>
Date: Sun, 31 May 2020 15:05:20 +0200
Subject: [PATCH 4/4] Update doubly_linked_list.py

---
 data_structures/linked_list/doubly_linked_list.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/data_structures/linked_list/doubly_linked_list.py b/data_structures/linked_list/doubly_linked_list.py
index f15ec2cbdc78..6d38cdeab202 100644
--- a/data_structures/linked_list/doubly_linked_list.py
+++ b/data_structures/linked_list/doubly_linked_list.py
@@ -16,11 +16,11 @@ class LinkedList:  # making main class named linked list
     >>> linked_list.insertTail("b")
     >>> _ = linked_list.deleteTail()
     >>> linked_list.isEmpty()
-    True
+    False
     >>> linked_list.deleteHead()
     None
     >>> linked_list.isEmpty()
-    False
+    True
     """
 
     def __init__(self):