以“rt"和“wt"模式打开文件 [英] Open files in 'rt' and 'wt' modes

问题描述

在这里好几次，我看到人们使用 rt 和 wt 模式来读取和写入文件.

Several times here on SO I've seen people using rt and wt modes for reading and writing files.

例如:

with open('input.txt', 'rt') as input_file:
     with open('output.txt', 'wt') as output_file: 
         ...

我没有看到模式记录，但是因为open() 不会抛出错误 - 看起来使用起来非常合法.

I don't see the modes documented, but since open() doesn't throw an error - looks like it's pretty much legal to use.

它的用途是什么，使用 wt 与 w 和 rt 与 r 之间有什么区别吗?

What is it for and is there any difference between using wt vs w and rt vs r?

推荐答案

t 指的是文本模式.r 和 rt 或 w 和 wt 之间没有区别，因为文本模式是默认的.

t refers to the text mode. There is no difference between r and rt or w and wt since text mode is the default.

记录在此处:

Character   Meaning
'r'     open for reading (default)
'w'     open for writing, truncating the file first
'x'     open for exclusive creation, failing if the file already exists
'a'     open for writing, appending to the end of the file if it exists
'b'     binary mode
't'     text mode (default)
'+'     open a disk file for updating (reading and writing)
'U'     universal newlines mode (deprecated)

默认模式为'r'(打开阅读文本，'rt'的同义词).

The default mode is 'r' (open for reading text, synonym of 'rt').

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