# Grades2 Example
# Source code file: grades2.py
# Input file: grades.txt

# Compute the average of all the grades.
# To compute the average, we keep track of
# the sum and the count of the grades.

sum = 0
count = 0

fin = open("grades.txt", "r")

# Read first line from file
line = fin.readline( )

# Process lines until end of file
while line != "":
    grade = int(line.strip( ))
    sum = sum + grade
    count = count + 1
    line = fin.readline( )

print(sum, count)
print("Average of grades:", round(sum / count, 2))
fin.close( )

# Output:
# Average of grades: 88.88