Complex Number with basic functionalities

complexno.py

+class ComplexNumber:
+    a = 0
+    b = 0
+    def __init__(self,real, imaginary):
+        self.a = real
+        self.b = imaginary
+    def __add__(self,c):
+        if(type(c)==ComplexNumber):
+            return ComplexNumber(c.a+self.a,c.b+self.b)
+        else:
+            return ComplexNumber(c+self.a,c+self.b)
+    def __mul__(self,c):
+        if(type(c)==ComplexNumber):
+            return ComplexNumber(self.a*c.a - self.b*c.b, self.b*c.a+self.a*c.b)
+        else:
+            return ComplexNumber(self.a*c, self.b*c)
+    def __rmul__(self,c):
+        if(type(c)==ComplexNumber):
+            return ComplexNumber(self.a*c.a - self.b*c.b, self.b*c.a+self.a*c.b)
+        else:
+            return ComplexNumber(self.a*c, self.b*c)
+    def __truediv__(self,c):
+        return ComplexNumber(self.a+c.a,self.b+c.b)
+    def __mul__(self,c):
+        return ComplexNumber(self.a*c.a - self.b*c.b, self.b*c.a+self.a*c.b)
+    def __div__(self,c):
+        return ComplexNumber(self.a/c, self.b/c)
+    def __str__(self):
+        return str(self.a)+"+i"+str(self.b)
+    def __radd__(self,c):
+        if(type(c)==ComplexNumber):
+            return ComplexNumber(c.a+self.a,c.b+self.b)
+        else:
+            return ComplexNumber(c+self.a,c+self.b)