From 2f2e349247ef387b88b334624386574ade332ee5 Mon Sep 17 00:00:00 2001
From: pppig <44393853+pppigg@users.noreply.github.com>
Date: Mon, 17 May 2021 22:29:29 +0800
Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=200509.=E6=96=90=E6=B3=A2?=
 =?UTF-8?q?=E9=82=A3=E5=A5=91=E6=95=B0=20Python3=E7=89=88=E6=9C=AC?=
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---
 problems/0509.斐波那契数.md | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/problems/0509.斐波那契数.md b/problems/0509.斐波那契数.md
index 8be11312..112c96f9 100644
--- a/problems/0509.斐波那契数.md
+++ b/problems/0509.斐波那契数.md
@@ -187,7 +187,24 @@ class Solution {
 ```
 
 Python：
+```python3
+class Solution:
+    def fib(self, n: int) -> int:
+        if n < 2:
+            return n
+        a, b, c = 0, 1, 0
+        for i in range(1, n):
+            c = a + b
+            a, b = b, c
+        return c
 
+# 递归实现
+class Solution:
+    def fib(self, n: int) -> int:
+        if n < 2:
+            return n
+        return self.fib(n - 1) + self.fib(n - 2)
+```
 
 Go：