Update 0860.柠檬水找零.md

Added python version code

problems/0860.柠檬水找零.md

@@ -156,7 +156,30 @@ class Solution {
 ```
 
 Python：
+```python
+class Solution:
+    def lemonadeChange(self, bills: List[int]) -> bool:
+        five, ten, twenty = 0, 0, 0
+        for bill in bills:
+            if bill == 5:
+                five += 1
+            elif bill == 10:
+                if five < 1: return False
+                five -= 1
+                ten += 1
+            else:
+                if ten > 0 and five > 0:
+                    ten -= 1
+                    five -= 1
+                    twenty += 1
+                elif five > 2:
+                    five -= 3
+                    twenty += 1
+                else:
+                    return False
+        return True
 
+```
 
 Go：