solution1.py

import csv
import urllib.request
import codecs

url = "https://s3.amazonaws.com/carto-1000x/data/yellow_tripdata_2016-01.csv"
stream = urllib.request.urlopen(url)
csvfile = csv.DictReader(codecs.iterdecode(stream, 'utf-8'))
count = 0
z = 0.0
for line in csvfile:
    z = float(line['tip_amount']) + z
    count = count + 1

print("final")
print(z)
print(count)
avg = z/count
print(avg)