在Python2和Python3中编写不同的十六进制值 [英] Write different hex-values in Python2 and Python3

问题描述

我当前正在将Python2脚本移植到Python3，并在此行遇到问题:

I'm currently porting a Python2 script to Python3 and have problems with this line:

print('\xfe')

当我使用Python2 python test.py > test.out运行它时，文件像预期的那样由十六进制值FE 0A组成.

When I run it with Python2 python test.py > test.out, than the file consists of the hex-values FE 0A, like expected.

但是当我使用Python3 python3 test.py > test.out运行它时，该文件由十六进制值C3 BE 0A组成.

But when I run it with Python3 python3 test.py > test.out, the file consists of the hex-values C3 BE 0A.

这是怎么回事?如何使用Python3接收所需的输出FE 0A.

What's going wrong here? How can I receive the desired output FE 0A with Python3.

推荐答案

字节序列C3 BE是UTF-8编码的字符

The byte-sequence C3 BE is the UTF-8 encoded representation of the character U+00FE.

Python 2将字符串作为字节序列而不是字符来处理.因此'\xfe'是一个包含一个字节的str对象.

Python 2 handles strings as a sequence of bytes rather than characters. So '\xfe' is a str object containing one byte.

在Python 3中，字符串是(Unicode)字符的序列.因此，代码'\xfe'是包含一个字符的字符串.当您打印字符串时，必须将其编码为字节.由于您的环境选择了UTF-8的默认编码，因此已对其进行了相应的编码.

In Python 3, strings are sequences of (Unicode) characters. So the code '\xfe' is a string containing one character. When you print the string, it must be encoded to bytes. Since your environment chose a default encoding of UTF-8, it was encoded accordingly.

如何解决此问题取决于您的数据.是字节还是字符?如果是字节，则更改代码以告知解释器:print(b'\xfe').如果它是字符，但是您希望使用不同的编码，则对字符串进行相应的编码:print( '\xfe'.encode('latin1') ).

How to solve this depends on your data. Is it bytes or characters? If bytes, then change the code to tell the interpreter: print(b'\xfe'). If it is characters, but you wanted a different encoding then encode the string accordingly: print( '\xfe'.encode('latin1') ).

这篇关于在Python2和Python3中编写不同的十六进制值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！