在Python中以十六进制打印变量 [英] Print a variable in hexadecimal in Python

问题描述

我正在尝试找到一种以十六进制打印字符串的方法.例如，我有这个字符串，然后将其转换为十六进制值.

I'm trying to find a way to print a string in hexadecimal. For example, I have this string which I then convert to its hexadecimal value.

my_string = "deadbeef"
my_hex = my_string.decode('hex')

如何将my_hex打印为0xde 0xad 0xbe 0xef?

为了使我的问题更清楚...假设我有一些像0x01, 0x02, 0x03, 0x04这样的数据存储在一个变量中.现在，我需要以十六进制打印它，以便可以读取它.我想我正在寻找与printf("%02x", my_hex)等效的Python.我知道有print '{0:x}'.format()，但是不能与my_hex一起使用，也不会用零填充.

To make my question clear... Let's say I have some data like 0x01, 0x02, 0x03, 0x04 stored in a variable. Now I need to print it in hexadecimal so that I can read it. I guess I am looking for a Python equivalent of printf("%02x", my_hex). I know there is print '{0:x}'.format(), but that won't work with my_hex and it also won't pad with zeroes.

推荐答案

您的意思是您想在my_hex中包含一个 bytes 字符串，您希望将其打印为十六进制数字，对吗?例如，让我们举个例子:

You mean you have a string of bytes in my_hex which you want to print out as hex numbers, right? E.g., let's take your example:

>>> my_string = "deadbeef"
>>> my_hex = my_string.decode('hex')  # python 2 only
>>> print my_hex
Þ ­ ¾ ï

此构造仅适用于Python 2；但是您可以在Python 2或Python 3中编写与文字相同的字符串，如下所示:

This construction only works on Python 2; but you could write the same string as a literal, in either Python 2 or Python 3, like this:

my_hex = "\xde\xad\xbe\xef"

那么，答案就来了.这是将字节打印为十六进制整数的一种方法:

So, to the answer. Here's one way to print the bytes as hex integers:

>>> print " ".join(hex(ord(n)) for n in my_hex)
0xde 0xad 0xbe 0xef

理解将字符串分解为字节，ord()将每个字节转换为相应的整数，并且hex()格式化0x##中的每个整数.然后在它们之间添加空格.

The comprehension breaks the string into bytes, ord() converts each byte to the corresponding integer, and hex() formats each integer in the from 0x##. Then we add spaces in between.

奖金:如果您将此方法与unicode字符串(或Python 3字符串)一起使用，则理解将为您提供unicode字符(而不是字节)，即使它们大于两位数，您也将获得适当的十六进制值

Bonus: If you use this method with unicode strings (or Python 3 strings), the comprehension will give you unicode characters (not bytes), and you'll get the appropriate hex values even if they're larger than two digits.

在Python 3中，您更可能希望使用字节字符串来完成此操作；在这种情况下，理解已经返回整数，因此您必须省去ord()部分，只需对它们调用hex()即可:

In Python 3 it is more likely you'll want to do this with a byte string; in that case, the comprehension already returns ints, so you have to leave out the ord() part and simply call hex() on them:

>>> my_hex = b'\xde\xad\xbe\xef'
>>> print(" ".join(hex(n) for n in my_hex))
0xde 0xad 0xbe 0xef

这篇关于在Python中以十六进制打印变量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！