Python：如何计算文件中的数字总和？

Question

How do I calculate the sum of numbers from a .txt file?

Data in file is formatted as:

7
8
14
18
16
8
23
...

I read the data from the file and assign every line value to 'line' vatiable, but I want to get something like: result = 7+8+14+...

f = open('data.txt', 'r')   #LOOP AND READ DATA FROM THE FILE
    for line in f:
        code

Answer 1

This is most compact code I can think of right now: (updated to handle the n at the end, thanks, @JonClements!)

with open('file.txt', 'r') as fin:
    ans = sum(int(line) for line in fin if line.strip().isnumeric())

For the code structure you have, you can also go for this:

f = open('data.txt', 'r')
ans = 0
for line in f:
    try:
        ans += int(line.strip())
    except ValueError:
        pass

Edit: Since the confusion with the 'n' has been cleared, the first example can be as simple as

with open('file.txt', 'r') as fin:
    ans = sum(int(line) for line in fin)

Or even this one-liner:

ans = sum(int(line) for line in open('file.txt', 'r'))

But there are certain risks with file handling, so not strongly recommended.

Answer 2

file = open("data.txt", "r")
numbers = []

for line in file:
  numbers.append(int(line))

print(sum(numbers))

This basically just creates a list of numbers, where each line is a new entry in the list. Then it shows the sum of the list.

Answer 3

A simple solution is, it will take care of the \\n at the end of each line as well, based on steven's and AChamp's suggestion

with open("abc.txt","r")as f:
    print(sum(int(x) for x in f))

Answer 4

Keep it simple:

with open('data.txt', 'r') as f:
    result = sum(map(int, f))

int is mapped over each line from f , then sum() adds up the resulting integers.

Answer 5

Here is a solution (consider all of the lines are numbers):

def calculate_number_in_file(file_path):
    with open(file_path, 'r') as f:
        return sum([int(number.strip()) for number in f.readlines()])

Answer 6

On smartphone...

with open(filepath) as f:
    lines = f.readlines()
numbers = [int(line) for line in lines]
print(sum(numbers))

Answer 7

with open ('data.txt', 'r') as f:
    data = f.readlines()

sum = 0
for line in data:
    sum += int(line.strip())

print(sum)