之间的区别:"file.readlines()"，"list(file)"和"file.read().splitlines(True)"? [英] Is there a difference between : "file.readlines()", "list(file)" and "file.read().splitlines(True)"?

问题描述

之间的区别是什么:

with open("file.txt", "r") as f:
    data = list(f)

或:

with open("file.txt", "r") as f:
    data = f.read().splitlines(True)

或:

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

它们似乎产生完全相同的输出. 一个比另一个更好(或更pythonic)吗?

They seem to produce the exact same output. Is one better (or more pythonic) than the other ?

推荐答案

显式比隐式好，所以我更喜欢:

Explicit is better than implicit, so I prefer:

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

但是，在可能的情况下，最Python化的是直接使用文件迭代器，而无需将所有内容加载到内存中，例如:

But, when it is possible, the most pythonic is to use the file iterator directly, without loading all the content to memory, e.g.:

with open("file.txt", "r") as f:
    for line in f:
       my_function(line)

这篇关于之间的区别:"file.readlines()"，"list(file)"和"file.read().splitlines(True)"?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！