feat: 172.factorial-trailing-zeroes add Python3 implementation (azl397985856#104)

Author: ybian19

problems/172.factorial-trailing-zeroes.md

@@ -44,12 +44,13 @@ Note: Your solution should be in logarithmic time complexity.
 
 - 数论
 
-
 ## 代码
 
-```js
+* 语言支持：JS，Python
 
+Javascript Code:
 
+```js
 /*
  * @lc app=leetcode id=172 lang=javascript
  *
@@ -61,7 +62,7 @@ Note: Your solution should be in logarithmic time complexity.
  */
 var trailingZeroes = function(n) {
   // tag: 数论
-  
+
   // if (n === 0) return n;
 
   // 递归： f(n) = n / 5 + f(n / 5)
@@ -74,3 +75,22 @@ var trailingZeroes = function(n) {
   return count;
 };
 ```
+
+Python Code:
+
+```python
+class Solution:
+    def trailingZeroes(self, n: int) -> int:
+        count = 0
+        while n >= 5:
+            n = n // 5
+            count += n
+        return count
+
+
+# 递归
+class Solution:
+    def trailingZeroes(self, n: int) -> int:
+        if n == 0: return 0
+        return n // 5 + self.trailingZeroes(n // 5)
+```