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How to write numbers to a text file (line by line) and add all of them?

I'm making a stock game's python version. There are stock prices and users can buy them. I need to make a thing that shows the average price of purchases made by the user when buying more than 0 stocks. Stock prices are connected to a randomizer. That's the story. But I think I can make a smaller code and then place that code into that game's code. Here's that small code:
numA=int(input("Number 1: "))
numB=int(input("Number 2: "))
with open('average.txt','a') as avg:
avg.write(str(numA))
avg.write("\n")
avg.write(str(numB))
avg.write("\n")
How can I make a code that reads the text file and sums numA and numB without doing something like total=numA+numB. I want the program to import it from the text file because as I said, I'm making a bigger program that includes loops and I will use the text file as memory.

you can try this one :
import numpy as np
with open('average.txt','r') as avg:
lines = avg.readlines()
Sum = np.sum([int(line.rstrip()) for line in lines], axis = 0)

Do you want something like this?
with open("New Text Document.txt", "r") as file:
text = file.read()
nums = text.replace("\n", " ").split(" ")
nums = (int(i) for i in nums if i.isdigit())
total = sum(nums)
I basically read the file in read mode and stored it inside of the text variable. Then I replaced all the newlines with spaces and then split the string by spaces. Then I used a generator comprehension to check if the element I is a number and if it is, I added it to the nums generator. And finally I used sum to get the sum of the numbers inside of the nums generator.
Or you could do something like this:
with open("file", "r") as file:
try:
total = sum(map(int, file))
except ValueError:
print("File has to contain only numbers.")

Troubles averaging all the grades from a "CSV" file

So I am new to python and I am having a hard time figuring this code. I am trying to use "CSV File" called exam_grades.csv and then write a function that reads in all my values in the file but using the string class split() method to split this long string into a list of strings. Each string represents a grade. Then my function should return the average of all the grades.
So far this is what I have; I can open the .csv file just fine but I'm having troubles averaging all the grades. I have some commented out because I am sure where to go from what I have been doing :(
def fileSearch():
'Problem 4'
readfile = open('exam_grades.csv', "r")
for line in readfile:
l = line.split(str(","))
#num_grades = len(l)
#averageAllGrades = l * 500
#return num_grades
print(l)
fileSearch()
Any advice?
Thanks!

Most CSV files have a header at the top, you'll want to skip that but for simplicity sake, let's say we ignore that.
Here's some code that works:
def fileSearch():
'Problem 4'
readfile = open('exam_grades.csv', "r")
grade_sum = 0
grade_count = 0
for line in readfile:
l = line.split(str(","))
for grade in l:
grade_sum += int(grade)
grade_count += 1
print(grade_sum/grade_count)
fileSearch()
This assumes you have multiple lines with grades and multiple grades per line.
We're keeping track of two variables here, the sum of all grades and the number of all grades we've added to the list (we're also casting to integers, since you're going to be reading strings).
When you add all the grades up and divide by the number of grades, you get an average.
Hope this helped.

List Comprehension; compacting code to two lines

The basic outline of this problem is to read the file, look for integers using the re.findall(), looking for a regular expression of '[0-9]+' and then converting the extracted strings to integers and summing up the integers.
I have finished the problem, but I would like to go extra and condense the code down to two lines.
This is my original code:
import re
fh = raw_input("Enter filename: ")
#returns regex_sum_241882.txt as default when nothing is entered
if len(fh)<1 : fh = "regex_sum_241882.txt"
file = open(fh)
sums = list()
#goes through each line in the file
for line in file:
#finds the numbers in each line and puts them in a list
nums = re.findall('[0-9]+',line)
#adds the numbers to an existing list
for num in nums:
sums.append(int(num))
#sums the list
print sum(sums)
Now here's my current compact code:
import re
lst = list()
print sum(for num in re.findall('[0-9]+',open("regex_sum_241882.txt").read())): int(num))
It doesn't work and gives me SyntaxError: invalid syntax
Can anyone point me in the right direction?
I feel I'm doing the same thing, but I'm not sure what the syntaxerror is about.

Try this way:
print sum(int(num) for num in re.findall('[0-9]+', open("regex_sum_241882.txt").read()))

how to create a list and sum up

I am relatively new to python and got stuck on the below:
Below is the code I am working with
import re
handle = open ('RegExWeek2.txt')
for line in handle:
line = line.rstrip()
x = re.findall('[0-9]+', line)
if len(x) > 0:
print x
The return from this code looks like this:
['7430']
['9401', '9431']
['2248', '2047']
['5517']
['3184', '1241']
['9939']
['2185', '9450', '8428']
['369']
['3683', '6442', '7654']
Question: how do I combine this to one list and sum up the numbers?
Please help

You may change your code like this,
handle = open ('RegExWeek2.txt')
num = []
for line in handle:
num.extend(re.findall('[0-9]+', line))
print sum(int(i) for i in num)
Since you're using re.findall, this line.rstrip() line is not necessary.
And also there won't be possible for x to be an empty list, since we are using + next to [0-9] (repeats the previous token one or more times) not * (zero or more times)

There's no need to rstrip, and you should open files using with:
import re
all_numbers = []
with open('RegExWeek2.txt') as file:
for line in file:
numbers = re.findall('[0-9]+', line)
for number in numbers:
all_numbers.append(int(number))
print(sum(all_numbers))
This is really beginner code, and a direct translation of yours. Here's how I would write it:
with open('RegExWeek2.txt') as file:
all_numbers = [int(num) for num in re.findall('[0-9]+', file.read())]
print(sum(all_numbers))

Adding Up Numbers From A List In Python

basically i'm trying to complete a read file. i have made the "make" file that will generate 10 random numbers and write it to a text file. here's what i have so far for the "read" file...
def main():
infile = open('mynumbers.txt', 'r')
nums = []
line = infile.readline()
print ('The random numbers were:')
while line:
nums.append(int(line))
print (line)
line = infile.readline()
total = sum(line)
print ('The total of the random numbers is:', total)
main()
i know it's incomplete, i'm still a beginner at this and this is my first introduction to computer programming or python. basically i have to use a loop to gather up the sum of all the numbers that were listed in the mynumbers.txt. any help would be GREATLY appreciated. this has been driving me up a wall.

You don't need to iterate manually in Python (this isn't C, after all):
nums = []
with open("mynumbers.txt") as infile:
for line in infile:
nums.append(int(line))
Now you just have to take the sum, but of nums, of course, not of line:
total = sum(nums)

The usual one-liner:
total = sum(map(int, open("mynumbers.txt")))
It does generate a list of integers (albeit very temporarily).

Although I would go with Tim's answer above, here's another way if you want to use readlines method
# Open a file
infile = open('mynumbers.txt', 'r')
sum = 0
lines = infile.readlines()
for num in lines:
sum += int(num)
print sum

Just another solution... :-)
with open("x.txt") as file:
total = sum(int(line) for line in file)
This solution sums the "results" of a generator object so it isn't memory intensive yet short and elegant (pythonic).