# Kids2 Example
# Source code file: kids2.py
# Input file: kids.txt

# Compute the average of all the girls.
# To compute the average, keep track of
# the sum and the count of the grades,
# but only use the lines where gender == "F".

sum = 0
count = 0

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

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

# Process lines until end of file
while line != "":
    fields = line.split(",")
    name = fields[0].strip( )
    gender = fields[1].strip( )
    age = int(fields[2].strip( ))
    if gender == "F":
        sum = sum + age
        count = count + 1
        
    line = fin.readline( )

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

# Output:
# Average of girl's ages: 9.33