ComplexNumber class implemented

complexno.py

+class ComplexNumber:
+	real = 0.0
+	img = 0.0
+	def __init__(self,real=0,img=0):
+		self.real = real
+		self.img = img
+
+	def __str__(self):
+		if(self.img==0):
+			return "%s" % (self.real)
+		elif(self.real==0):
+			return "%s" % (self.img)
+		else:
+			return "%s+i%s" % (self.real,self.img)
+
+	def __radd__(self,other):
+		return ComplexNumber(self.real + other,self.img)
+
+	def __add__(self,other):
+		sum_real = self.real + other.real
+		sum_img = self.real + other.real
+		return ComplexNumber(sum_real,sum_img)
+
+	def __mul__(self,other):
+		mul_real = self.real*other.real-self.img*other.img
+		mul_img = self.real*other.img + self.img*other.real
+		return ComplexNumber(mul_real,mul_img)
+
+	def __rmul__(self,other):
+		rmul_real = self.real*other
+		rmul_img = self.img*other
+		return ComplexNumber(rmul_real,rmul_img)
+
+i1 = ComplexNumber(1,1)
+i2 = ComplexNumber(2,0)
+i3 = i1+i2
+# print(sum([i1,i2]))
+i4 = i1*i3
+print(i1)
+print(i2)
+print(i3)
+print(i4)
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