From 3389f6799cb39b16817ad22f49a7acfa36135dfe Mon Sep 17 00:00:00 2001
From: evanlai <sky_lmc@foxmail.com>
Date: Sun, 30 May 2021 14:07:55 +0800
Subject: [PATCH 1/4] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=200203.=E7=A7=BB?=
 =?UTF-8?q?=E9=99=A4=E9=93=BE=E8=A1=A8=E5=85=83=E7=B4=A0=20python3?=
 =?UTF-8?q?=E7=89=88=E6=9C=AC?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 problems/0203.移除链表元素.md | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/problems/0203.移除链表元素.md b/problems/0203.移除链表元素.md
index dce5d265..cac9f233 100644
--- a/problems/0203.移除链表元素.md
+++ b/problems/0203.移除链表元素.md
@@ -208,7 +208,23 @@ public ListNode removeElements(ListNode head, int val) {
 ```
 
 Python：
-
+```python
+# Definition for singly-linked list.
+# class ListNode:
+#     def __init__(self, val=0, next=None):
+#         self.val = val
+#         self.next = next
+class Solution:
+    def removeElements(self, head: ListNode, val: int) -> ListNode:
+        dummy_head = ListNode(next=head) #添加一个虚拟节点
+        cur = dummy_head
+        while(cur.next!=None):
+            if(cur.next.val == val):
+                cur.next = cur.next.next #删除cur.next节点
+            else:
+                cur = cur.next
+        return dummy_head.next
+```
 
 Go：
 

From 5e1860876b8d594d2e4d74a03772495c06cc357f Mon Sep 17 00:00:00 2001
From: evanlai <sky_lmc@foxmail.com>
Date: Sun, 30 May 2021 14:10:11 +0800
Subject: [PATCH 2/4] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=200206.=E7=BF=BB?=
 =?UTF-8?q?=E8=BD=AC=E9=93=BE=E8=A1=A8=20python3=E7=89=88=E6=9C=AC?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 problems/0206.翻转链表.md | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/problems/0206.翻转链表.md b/problems/0206.翻转链表.md
index 52ef6484..7c002382 100644
--- a/problems/0206.翻转链表.md
+++ b/problems/0206.翻转链表.md
@@ -143,7 +143,25 @@ class Solution {
 ```
 
 Python：
-
+```python
+#双指针
+# Definition for singly-linked list.
+# class ListNode:
+#     def __init__(self, val=0, next=None):
+#         self.val = val
+#         self.next = next
+class Solution:
+    def reverseList(self, head: ListNode) -> ListNode:
+        cur = head   
+        pre = None
+        while(cur!=None):
+            temp = cur.next # 保存一下 cur的下一个节点，因为接下来要改变cur->next
+            cur.next = pre #反转
+            #更新pre、cur指针
+            pre = cur
+            cur = temp
+        return pre
+```
 
 Go：
 

From 013ba0575ed1729e8a1c31c251313e379d38adc2 Mon Sep 17 00:00:00 2001
From: evanlai <sky_lmc@foxmail.com>
Date: Sun, 30 May 2021 14:13:38 +0800
Subject: [PATCH 3/4] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=200019.=E5=88=A0?=
 =?UTF-8?q?=E9=99=A4=E9=93=BE=E8=A1=A8=E7=9A=84=E5=80=92=E6=95=B0=E7=AC=AC?=
 =?UTF-8?q?N=E4=B8=AA=E8=8A=82=E7=82=B9=20python3=E7=89=88=E6=9C=AC?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 ...0019.删除链表的倒数第N个节点.md | 24 +++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/problems/0019.删除链表的倒数第N个节点.md b/problems/0019.删除链表的倒数第N个节点.md
index 7d2fe97e..52735794 100644
--- a/problems/0019.删除链表的倒数第N个节点.md
+++ b/problems/0019.删除链表的倒数第N个节点.md
@@ -112,6 +112,30 @@ class Solution {
     }
 }
 ```
+
+Python:
+```python
+# Definition for singly-linked list.
+# class ListNode:
+#     def __init__(self, val=0, next=None):
+#         self.val = val
+#         self.next = next
+class Solution:
+    def removeNthFromEnd(self, head: ListNode, n: int) -> ListNode:
+        head_dummy = ListNode()
+        head_dummy.next = head
+
+        slow, fast = head_dummy, head_dummy
+        while(n!=0): #fast先往前走n步
+            fast = fast.next
+            n -= 1
+        while(fast.next!=None):
+            slow = slow.next
+            fast = fast.next
+        #fast 走到结尾后，slow的下一个节点为倒数第N个节点
+        slow.next = slow.next.next #删除
+        return head_dummy.next
+```
 Go:
 ```Go
 /**

From e98fb5a56f256371d01ed7e9456aa0fde805626f Mon Sep 17 00:00:00 2001
From: evanlai <sky_lmc@foxmail.com>
Date: Sun, 30 May 2021 14:21:41 +0800
Subject: [PATCH 4/4] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=20=E9=9D=A2=E8=AF=95?=
 =?UTF-8?q?=E9=A2=9802.07.=E9=93=BE=E8=A1=A8=E7=9B=B8=E4=BA=A4=20python3?=
 =?UTF-8?q?=E7=89=88=E6=9C=AC?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 problems/面试题02.07.链表相交.md | 37 +++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/problems/面试题02.07.链表相交.md b/problems/面试题02.07.链表相交.md
index 13014dd1..78f34e71 100644
--- a/problems/面试题02.07.链表相交.md
+++ b/problems/面试题02.07.链表相交.md
@@ -151,7 +151,44 @@ public class Solution {
 ```
 
 Python：
+```python
+# Definition for singly-linked list.
+# class ListNode:
+#     def __init__(self, x):
+#         self.val = x
+#         self.next = None
 
+class Solution:
+    def getIntersectionNode(self, headA: ListNode, headB: ListNode) -> ListNode:
+        lengthA,lengthB = 0,0
+        curA,curB = headA,headB
+        while(curA!=None): #求链表A的长度
+            curA = curA.next
+            lengthA +=1
+        
+        while(curB!=None): #求链表B的长度
+            curB = curB.next
+            lengthB +=1
+        
+        curA, curB = headA, headB
+
+        if lengthB>lengthA: #让curA为最长链表的头，lenA为其长度
+            lengthA, lengthB = lengthB, lengthA
+            curA, curB = curB, curA
+
+        gap = lengthA - lengthB #求长度差
+        while(gap!=0): 
+            curA = curA.next #让curA和curB在同一起点上
+            gap -= 1
+        
+        while(curA!=None):
+            if curA == curB:
+                return curA
+            else:
+                curA = curA.next
+                curB = curB.next
+        return None
+```
 
 Go：