Python:如何对文本文件中的数字求和 [英] Python: How to sum numbers from text file

问题描述

如何在python中对文本文件中的数字求和?假设我们有一些文本文档，其中包含这样的数字:

How to sum numbers from text file in python? Let's say that we have some text document that have numbers like this:

320
5203
5246

我们希望 python 打开那个文件并对这些数字求和得到结果:10769.我该怎么做?

And we want python open that file and sum those numbers to get to the result: 10769. How shall I do this?

推荐答案

如果文件不是太大，可以直接将文件读入数组，使用列表推导将行转换为整数列表，然后计算其总和:

If the file is not too big, you can just read the file into an array, use a list comprehension to convert the lines into a list of integers and then compute the sum of that:

sum([int(s.strip()) for s in open('foo.txt').readlines()])

然而，这会将整个文件读入内存.如果您的文件很大，以命令方式累积总和可能会占用较少的内存:

However, this reads the entire file into memory. If your file is large it would probably be less memory-intensive to accumulate the sum in an imperative manner:

result = 0
for s in open('foo.txt'): result += int(s.strip())

或者作为生成器表达式，这样列表就不需要存储在内存中

Or as a generator expression so that a list does not need to be stored in-memory

sum(int(s.strip()) for s in open('foo.txt'))

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