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diff --git a/q01_create_class/__pycache__/build.cpython-36.pyc b/q01_create_class/__pycache__/build.cpython-36.pyc
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diff --git a/q01_create_class/build.py b/q01_create_class/build.py
index a0188d6..381d0e6 100644
--- a/q01_create_class/build.py
+++ b/q01_create_class/build.py
@@ -1,15 +1,63 @@
+# %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.
+    
+    def __init__(self, x, y):
+        self.real = x
+        self.imag = y
+        
+    def __str__(self):
+        operator = '+'
+        if self.imag < 0:
+            operator = '-'
+        return '%.2f %s %.2fi'%(self.real, operator, abs(self.imag))
+    
+    def __add__(self, other):
+        new_x = self.real + other.real
+        new_y = self.imag + other.imag
+        return complex_number(new_x, new_y)
+    
+    def __sub__(self, other):
+        new_x = self.real - other.real
+        new_y = self.imag - other.imag
+        return complex_number(new_x, new_y)
+    
+    def __mul__(self, other):
+        new_x = (self.real * other.real) - (self.imag * other.imag)
+        new_y = (self.real * other.imag) + (self.imag * other.real)
+        return complex_number(new_x, new_y)
+    
+    def __truediv__(self, other):
+        new_x = (self.real * other.real) + (self.imag * other.imag)
+        new_y = (self.imag * other.real) - (self.real * other.imag)
+
+        denominator = ((other.real ** 2) + (other.imag ** 2))
+        
+        new_x = new_x / denominator
+        new_y = new_y / denominator
+
+        return (new_x, new_y)
+    
+    def __abs__(self):
+        return self.abs()
+    
+    def abs(self):
+        squares = (self.real ** 2) + (self.imag ** 2)
+        return math.sqrt(squares)
+        
+    def conjugate(self):
+        return complex_number(self.real, -self.imag)
+    
+    def argument(self):
+        radians = math.atan2(self.imag, self.real);
+        return math.degrees(radians)
+
+
 
-    Attributes:
-    attr1 (x): Real part of complex number.
-    attr2 (y): Imaginary part of complex number.
 
-    """
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