voidnerd

from csv import reader, DictReader
from sys import argv, exit

sequences = {}

#validate input
if len(argv) < 3:
    print("Usage:", "python dna.py data.csv sequence.txt")
    exit(1);

Edmundworks

from cs50 import get_float
# Get positive float from user
while True:
    change = get_float("Change owed: ")
    if change > 0:
        break
# declare variables
total, count = change * 100, 0
# calculate count of coins
for x in [25, 10, 5, 1]: