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중첩함수.py

+import math
+def stddev(*args):
+    def mean():
+        return sum(args) / len(args)
+    def variance(m):
+        total = 0
+        for arg in args:
+            total += (arg - m) ** 2
+        return total / (len(args)-1)
+    v = variance(mean())
+    return math.sqrt(v)
+
+print(stddev(2.3, 1.7, 1.4, 0.7, 1.9))
+print(stddev(1,2,3))
+
+# print(stddev(1))
+# ZeroDivisionError
+
+# print(mean(1,2))
+# NotDefined
+