@@ -0,0 +1,21 @@
+class C1():
+    def c1_m(self):
+        print("c1_m")
+    def m(self):
+        print("C1 m")
+
+class C2():
+    def c2_m(self):
+        print("c2_m")
+    def m(self):
+        print("C2 m")
+
+class C3(C2, C1):
+    def m(self):
+        print("C3 m")
+
+c = C3()
+c.c1_m()
+c.c2_m()
+c.m()
+print(C3.__mro__)
@@ -0,0 +1,25 @@
+class CalMultiply():
+    def multiply(self):
+        return self.v1*self.v2
+class CalDivide():
+    def divide(self):
+        return self.v1/self.v2
+class Cal(CalMultiply, CalDivide):
+    def __init__(self, v1, v2):
+        if isinstance(v1, int):
+            self.v1 = v1
+        if isinstance(v2, int):
+            self.v2 = v2
+    def add(self):
+        return self.v1+self.v2
+    def subtract(self):
+        return self.v1-self.v2
+    def setV1(self, v):
+        if isinstance(v, int):
+            self.v1 = v
+    def getV1(self):
+        return self.v1
+c = Cal(100, 10)
+print(c.add())
+print(c.multiply())
+print(c.divide())