# CSE 142 Python sessions
# This program reads a file of gas prices for the USA and Belgium
# and outputs the average gas price for each country.
#
# The input file format is:
# 8.20   3.81   3/21/11
# 8.08   3.84   3/28/11
# ...

belgium_total = 0.0
usa_total = 0.0
days = 0

f = open("gasprices.txt")
for line in f:                           # line = "8.20   3.81   3/21/11"
    belgium, usa, date = line.split()    # unpack the line into vars using split
    belgium_total += float(belgium)      # b = "8.20"
    usa_total += float(usa)              # u = "3.81"  (must convert to numbers)
    days += 1

print("Belgium average:", belgium_total / days)
print("USA average    :", usa_total / days)