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diff --git a/q01_create_class/build.py b/q01_create_class/build.py
index a0188d6..6c8d41f 100644
--- a/q01_create_class/build.py
+++ b/q01_create_class/build.py
@@ -1,15 +1,48 @@
+# %load q01_create_class/build.py
 import pandas as pd
 import numpy as np
 import math
 
-"write your solution here"
+'write your solution here'
 
 
 class complex_number:
-    """The complex number class.
+    '''The complex number class.
 
     Attributes:
     attr1 (x): Real part of complex number.
     attr2 (y): Imaginary part of complex number.
 
-    """
+    '''
+    def __init__(self,real,imag):
+        self.real = real
+        self.imag = imag
+    def __str__(self):
+        if self.imag <0:
+            return '{0} +i{1}.format(self.real,  self.imag)'
+        else: 
+            return '{}+ i{}.format(self.real,  self.imag)' 
+    def __add__(self,other):
+        return complex_number(self.real + other.real,
+                              self.imag + other.imag)
+    def __sub__(self,other):
+        return complex_number(self.real - other.real,
+                              self.imag - other.imag)
+    def __mul__(self,other):
+        return complex_number(self.real * other.real - self.imag * other.imag,
+                              self.imag * other.real + self.real * other.imag)
+    def __truediv__(first,second):
+        #r=(other.real+other.imag)
+        return((first.real * second.real+first.imag * second.imag)/(second.real*second.real +second.imag*second.imag),
+               (first.imag * second.real-first.imag * second.imag)/(second.real*second.real +second.imag*second.imag))
+    def abs(self):
+        return math.sqrt(self.real**2 + self.imag**2)
+    def conjugate(self):
+        return complex_number(self.real, -self.imag)
+    def argument(self):
+        return math.degrees(math.atan(self.real/self.imag))
+    
+        
+
+
+
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