def main():
    endProgram = 'no'
    print
    while endProgram == 'no':
        option = 0
print
print('Enter 1 to enter in new data and store to file')
print('Enter 2 to display data from the file')
option = input('Enter now ->')
option = int(option)
print

pints = [0] * 7
totalPints = getTotal(Pints)
averagePints = getAverage(totalPints)
if option == 1:
    pints = getPints(pints)
    totalPints = getTotal(pints)
    averagePints = getAverage(totalPints)
    writeToFile(averagePints, pints)
if option == 2:
    readFromFile()
else:
    endProgram = input('Do you want to end program? (Enter no or yes): ')
while not (endProgram == 'yes' or endProgram == 'no'):
    print ('Please enter a yes or no')
    endProgram = input('Do you want to end program? (Enter no or yes): ')

def getPints(pints):
    counter = 0
    while counter < 7:
        numEntered = input('Enter pints collected: ')
        pints[counter] = int(numEntered)
        counter = counter + 1
    return pints

def getTotal(pints):
    totalPints = 0
    counter = 0
    while counter < 7:
        totalPints = totalPints + pints[counter]
        counter = counter + 1
    return totalPints

def getAverage(totalPints):
    averagePints = float(totalPints) / 7
    return averagePints

def writeToFile(averagePints, pints):
    outFile = open('blood.txt', 'a')
    outFile.write('Pints Each Hour' + "\n")
    outFile.write(str(pints[counter]) + '\n')
    counter = counter + 1
    outFile.write(str(averagePints) + '\n\n')
    outFile.close()

def readFromFile():
    inFile = open('blood.txt', 'r')
    for line in inFile:
        print (line)
main()

Enter 1 to enter in new data and store to file
Enter 2 to display data from the file
Enter now ->Traceback (most recent call last):
  Line 9, in <module>
    option = input('Enter now ->')
EOFError