为什么 file.write() 修改 Python 中文件的内容

Question

谁能解释一下为什么文件内容在写入时被更改？

以及如何解决这个问题

c='''#include <iostream>

int 
main ()
{
  std::cout << "Hello, world!\n"; <== this line is getting changed in output
  return 0;
}
'''
with open('x.cpp','w+') as f:
    f.write(c)

代码的输出

#include <iostream>

int 
main ()
{
  std::cout << "Hello, world!
"; <= modified while doing write operation
  return 0;
}

我正在使用 Python 3.8

我做错了什么，我该如何解决？

谢谢

Answer 1

尝试将您的字符串更改为 raw 字符串。由于 \n 表示换行，因此您需要使用原始字符串

c=r'''#include <iostream>

int 
main ()
{
  std::cout << "Hello, world!\n"; <== this line is getting changed in output
  return 0;
}
'''

Lexical Analysis

Unless an 'r' or 'R' prefix is present, escape sequences in string and bytes literals are interpreted according to rules similar to those used by Standard C.

为什么 file.write() 修改 Python 中文件的内容

Why file.write() modifying the content of file in Python

python

string

io

file