diff --git "a/\347\254\254\344\272\214\346\234\237\350\256\255\347\273\203\350\220\245/4\347\217\255/4\347\217\255_\345\276\267\351\207\214\345\205\213/lesson3-3 homework.py" "b/\347\254\254\344\272\214\346\234\237\350\256\255\347\273\203\350\220\245/4\347\217\255/4\347\217\255_\345\276\267\351\207\214\345\205\213/lesson3-3 homework.py"
new file mode 100644
index 0000000000000000000000000000000000000000..608969b6b4bac8812c4dcd658f0367d4b40214ac
--- /dev/null
+++ "b/\347\254\254\344\272\214\346\234\237\350\256\255\347\273\203\350\220\245/4\347\217\255/4\347\217\255_\345\276\267\351\207\214\345\205\213/lesson3-3 homework.py"	
@@ -0,0 +1,69 @@
+#问题一，练习作用域之间的转换
+total = 0
+def sum(a, b):
+    total = a + b
+    print("函数内是局部变量：", total)
+    return total
+print(sum(5, 10))
+print("函数外是全局变量：", total)
+
+total1 = 1
+def func():
+    global total1
+    print(total1)
+    total1 = 2
+    print(total1)
+print(func())
+print(total1)
+
+def a():
+    total = 1
+    def b():
+        nonlocal total
+        total = 3
+        print(total)
+        return b
+    b()
+    print(total)
+a()
+
+#问题二，实现一个装饰器，用来输出函数的执行时间
+import time
+def clock_deco(func):
+    def wrap(*args, **kwargs):
+        start_time = time.time()
+        result = func(*args, **kwargs)
+        end_time = time.time()
+        print(f"{func.__name__} 执行时长为：{format(end_time - start_time, '.2f')}s")
+        return result
+    return wrap
+
+@clock_deco
+def cool(a, b):
+    num = 0
+    while True:
+        if num >= a ** b:
+            break
+        num += 1
+
+cool(5, 10)
+
+#问题三，使用装饰器来为斐波那契函数增加缓存
+a = {}
+def cache_deco(func):
+    global a
+    def wrap(n):
+        if n not in a:
+            a[n] = func(n)
+        return a[n]
+    return wrap
+
+@ cache_deco
+def fib(n):
+    if n < 2:
+        return n
+    else:
+        return fib(n - 2) + fib(n - 1)
+
+print(fib(10))
+print(a)
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