#from array_list import Array2D
from array import Array2D

filename = 'data.txt'

 # Open the text file for reading.
grade_file = open( filename, "r" )

 # Extract the first two values; indicate the size of the array.
num_students = int( grade_file.readline() )
num_exams = int( grade_file.readline() )

 # Create the 2-D array to store the grades.
exam_grades = Array2D( num_students, num_exams )

# print('n_students ', num_students, 'n_exams ', num_exams)

 # Extract the grades from the remaining lines.
i = 0
for student in grade_file :
  # print(' i ', i)
  grades = student.split()    
  for j in range( num_exams ):
    # print(' j ', j)
    exam_grades[i,j] = int( grades[j] )       
  i += 1   
   
 # Close the text file.      
grade_file.close()  

 # Compute each student's average exam grade.
print("Student Grade")
for i in range( num_students ) :

  total = 0
  for j in range( num_exams ) :
    total += exam_grades[i,j]
    
  exam_avg = total / num_exams
  print( "%2d:  %6.2f" % (i+1, exam_avg) )