在 Python 中将字节的二进制字符串表示形式转换为实际的二进制值
问题描述
我有一个字节的二进制字符串表示,比如
I have a binary string representation of a byte, such as
01010101
如何将其转换为真正的二进制值并将其写入二进制文件?
How can I convert it to a real binary value and write it to a binary file?
解决方案
使用int
函数 使用 base
的 2
来读取二进制值作为整数.
Use the int
function with a base
of 2
to read a binary value as an integer.
n = int('01010101', 2)
Python 2 使用字符串来处理二进制数据,因此您可以使用 chr()
函数 将整数转换为单字节字符串.
Python 2 uses strings to handle binary data, so you would use the chr()
function to convert the integer to a one-byte string.
data = chr(n)
Python 3 处理二进制和文本的方式不同,因此您需要使用 <代码>字节类型代替.这没有直接等效于 chr()
函数,但 bytes
构造函数可以采用字节值列表.我们将 n
放在一个元素数组中,并将其转换为 bytes
对象.
Python 3 handles binary and text differently, so you need to use the bytes
type instead. This doesn't have a direct equivalent to the chr()
function, but the bytes
constructor can take a list of byte values. We put n
in a one element array and convert that to a bytes
object.
data = bytes([n])
一旦你有了你的二进制字符串,你就可以以二进制模式打开一个文件并将数据写入它,如下所示:
Once you have your binary string, you can open a file in binary mode and write the data to it like this:
with open('out.bin', 'wb') as f:
f.write(data)
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