diff --git a/HW09.py b/HW09.py
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-testtesttest
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diff --git a/HW09_Xueshi_Wang.py b/HW09_Xueshi_Wang.py
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+++ b/HW09_Xueshi_Wang.py
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+""" Homework 09
+    Xueshi Wang
+    10.26.2018
+"""
+import os
+from collections import defaultdict
+from prettytable import PrettyTable
+import unittest
+
+class Repository:
+    def __init__(self, dir_path):
+        """Hold all the data files"""
+        
+        self.student_path = os.path.join(dir_path, 'students.txt')
+        self.instructor_path = os.path.join(dir_path, 'instructors.txt')
+        self.grade_path = os.path.join(dir_path, 'grades.txt')
+        self.student = dict()   # students[cwid] = Student(cwid, name, major)
+        self.instructor = dict()
+        
+        self.feed_student()
+        self.feed_instructor()
+
+    def feed_student(self):
+        """Feed data to student class and print the pretty table"""
+        try:
+            fp = open(self.student_path, 'r')
+        except FileNotFoundError:
+            raise FileNotFoundError('Error! Cannot open the student.txt file', self.student_path)
+        else:
+            with fp:         
+                for line in fp:
+                    line = line.strip().split('\t')
+                    self.student[line[0]] = Student(line[0], line[1], line[2])
+        try:
+            file = open(self.grade_path, 'r')
+        except FileNotFoundError:
+            raise FileNotFoundError('Error! Cannot open the grades.txt file', self.grade_path)
+        else:
+            with file:                
+                for grade_line in file:
+                    grade_line = grade_line.strip().split('\t')
+                    try:
+                        self.student[grade_line[0]].course_grade(grade_line[1], grade_line[2])
+                    except KeyError:
+                        raise KeyError("Grade file has a student ID that does not exist!")
+            self.table_stu(self.student)
+
+    def table_stu(self, stu):
+        """Print table for student"""
+        stu_pt = PrettyTable(field_names=Student.columns)
+        for key in stu.keys():
+            stu_pt.add_row([stu[key].CWID, stu[key].Name,sorted(list(stu[key].grade))])
+        print(stu_pt)
+             
+    def feed_instructor(self):
+        """Feed data to instructor class and print the pretty table"""
+        try:
+            fp = open(self.instructor_path, 'r')
+        except FileNotFoundError:
+            raise FileNotFoundError('Error! Cannot open the instructor.txt file', self.instructor_path)
+        else:
+            with fp:             
+                for line in fp:
+                    line = line.strip().split('\t')
+                    self.instructor[line[0]] = instructor(line[0], line[1], line[2])
+                  
+        try:
+            file = open(self.grade_path, 'r')
+        except FileNotFoundError:
+            raise FileNotFoundError('Error! Cannot open the grades.txt file', self.grade_path)
+        else:
+            with file:                             
+                for grade_line in file:
+                    grade_line = grade_line.strip().split('\t')
+                    try:
+                        self.instructor[grade_line[3]].num_course(grade_line[1])
+                    except KeyError:
+                        raise KeyError("Grade file has an instructor ID that does not exist!")
+            self.table_ins(self.instructor)
+
+    def table_ins(self, ins):
+        """Print the pretty table for instructor"""
+        ins_pt = PrettyTable(field_names = instructor.columns)
+        for key in ins.keys():
+            for a in ins[key].generator_ins():
+                ins_pt.add_row(a)
+        
+        print(ins_pt)
+
+class Student:
+    """Class for all the student records. CWID, Name, completed courses."""
+    columns = ['CWID', 'Name', 'Completed Courses'] #Class attributes for pretty table columns
+
+    def __init__(self, CWID, Name, Major):
+        """Student will have cwid, name, major, course name and grade"""
+        self.CWID = CWID
+        self.Name = Name
+        self.Major = Major
+        self.grade = defaultdict(str) #Course name is the key with grade be the value
+    def course_grade(self, course_name, letter_grade):
+        self.grade[course_name] = letter_grade
+
+class instructor:
+    """Class for all the instructor records. """
+    columns = ['CWID', 'Name', 'Dept', 'Course', 'Students']    #Class attributes for pretty table columns
+
+    def __init__(self, CWID, Name, Dept):
+        """Container for instructor"""
+        self.CWID = CWID
+        self.Name = Name
+        self.Dept = Dept
+        self.Course = defaultdict(int)  #Course name is the key with number of students be the value
+
+    def num_course(self, course_name):
+        """Add course and number of students to course dict"""
+        self.Course[course_name] += 1
+
+    def generator_ins(self):
+        """Generator for prettytable"""
+        for course_name, num in self.Course.items():
+            yield [self.CWID, self.Name, self.Dept, course_name, num]
+                   
+def main():
+    """Run repo"""
+    path = input("Please enter the path of student, instructor and grade. (All three files must exist in the same directory): ")
+    #path = r'D:\stevens\ssw 810'
+    Repository(path)
+
+ 
+if __name__ == '__main__':
+    main()
+
+
+class Test(unittest.TestCase):
+  
+    def test_instructor(self):
+        """Test instructor course function"""
+      
+        ins = instructor(5957, 'XW', 'SW')
+        for i in range(10):
+            ins.num_course("SSW 810")
+        for a in range(4):
+            ins.num_course("SSW 540")
+        dict = ins.Course
+        result = {"SSW 810":10, "SSW 540":4}
+        self.assertEqual(dict, result)
+        
+    def test_student(self):
+        """Test student course grade function"""
+        stu = Student(5950, "LT", "SW")
+        stu.course_grade("SSW 540", "A")
+        stu.course_grade("SSW 564", "A")
+        stu.course_grade("SSW 810", "A")
+        dict = stu.grade
+        result = {"SSW 540":"A", "SSW 564":"A", "SSW 810":"A"}
+        self.assertEqual(dict, result)
+
+if __name__ == '__main__':
+    unittest.main(exit=False, verbosity=2)
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