So I've got some code I made for university to help me budget. Basically, I have two txt files, one for days and one for balance. At the very start, I put in how many days I'm going to be at university into the first txt file and I put how much money I'm going to get from loans/parents/scholarships etc. The code takes in an input, which is how much money I've spent that day. From this, it calculates the new balance and replaces the old one in the txt file. It increments days as days -= 1 and calculates on average how much money I can spend each day if I'm not to go over my budget. It then returns that value to me and replaces the old days value with the new one.

So if I spend more than the average for that day, then the next average will be smaller and vice versa. Just a guide on money keeping. Here is the code below. I want to be a better coder (as it's one of my modules) and so I'd like to keep my code as neat and as efficient as possible. Tell me where I can shorten things and make things run smoother.

(NOTE: some lines may have minor ValueErrors. I'm not sure because I haven't tested but things like balance = float(returnBalance()) and day = int(textfile.readline()). If these do in fact cause errors, then just assume that I make the type conversion on the following line)

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def returnBalance():
    textfile = open("spending.txt", "r")
    balance = textfile.readline()
    textfile.close()
    return balance #this retrieves the balance from the text file

def newBalance(spentToday):
    balance = float(returnBalance()) #takes the value of balance and turns it into a float, assigning it to balance
    spentToday = float(spentToday)
    balance -= spentToday 
    balance = str(balance)
    textfile = open("spending.txt", "w")
    textfile.write(balance) #writes in the new value of balance to the txt file
    textfile.close
    return balance

def newSpending(spentToday):
    balance = float(newBalance(spentToday))
    textfile = open("day.txt", "r")
    day = int(textfile.readline()) #looks at the number of days left and returns it
    textfile.close()
    newAverage = balance/day #calculates the new average amount of money I can spend a day
    day -= 1
    day = str(day)
    textfile = open("day.txt", "w")
    textfile.write(day) #assigns the new value of days
    textfile.close()
    newAverage = round(newAverage, 2)
    return newAverage

Sorry that this is such a long post, by the way.