diff --git a/Day31-35/code/homework01.py b/Day31-35/code/homework01.py
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+++ b/Day31-35/code/homework01.py
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+# 经典递归求解问题:
+# 1. 迷宫寻路
+# 2. 汉诺塔(梵塔)
+# 3. 骑士周游
+# 4. 八皇后
+
+
+def f(n: int, m=1) -> int:
+    if n == 0 or n == 1:
+        return m
+    return f(n - 1, n * m)
+
+
+def sum(n: int) -> int:
+    if n == 1:
+        return 1
+    return n + sum(n - 1)
+
+
+def steps(n: int, m={}) -> int:
+    if n < 0:
+        return 0
+    elif n == 0:
+        return 1
+    else:
+        try:
+            return m[n]
+        except:
+            m[n] = steps(n - 1) + steps(n - 2) + steps(n - 3)
+            return m[n]
+
+
+def list_depth(items: list) -> int:
+    max_depth = 1 if isinstance(items, list) else 0
+    if max_depth:
+        for item in items:
+            if isinstance(item, list):
+                max_depth = max(max_depth, list_depth(item) + 1)
+    return max_depth
+
+
+
+def main():
+    mylist = [1, ['a', ['b', ['c']]],[100, [200, 300, [400, [500, [600, [700]]]]]]] 
+    thylist = [[], [[[]]], [[], []]]
+    print(list_depth(mylist))
+    print(list_depth(thylist))
+
+
+if __name__ == '__main__':
+    main()
diff --git a/Day41-55/res/Django-Flowchart.png b/Day41-55/res/Django-Flowchart.png
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diff --git a/Day41-55/res/Django-MTV.png b/Day41-55/res/Django-MTV.png
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