在python进程之间传递二进制数据 [英] Pass binary data between python processes
问题描述
我需要在linux上的python进程之间高效地传输二进制数据.但是我找不到通过管道传递它的方法.我最接近的是将其作为字符串传递，但是由于某种原因它保留了二进制形式，因此会给我带来麻烦.
I need to transfer binary data between python processes on linux efficiently. However I can't find a way to pass it with pipe. The closest I got was to pass it as string but it keeps its binary form for some reason so it causes me problems.
ciphertext, tag = cipher1.encrypt_and_digest(input().encode())
print(ciphertext)
密文是二进制的，但是当我在另一个进程中测试它的类型时
ciphertext is binary but when I test its type at the other process
print(type(sys.stdin.read()))
我知道
<class 'str'>
有什么想法吗?
推荐答案
在Python 3中，不能将print或input用于二进制数据.它们是为处理文本(Unicode)而不是二进制文件而设计的.您可以使用对sys.stdout.buffer和sys.stdin.buffer的文件.write和.read调用，它们是stdin和stdout的基础二进制缓冲区.您不能使用sys.stdout和sys.stdin，因为它们是用于文本的.在针对sys.stdin和sys.stdout .
In Python 3 you can't use print or input for binary data. They're designed for handling text (Unicode), not binary. You can use file .write and .read calls to sys.stdout.buffer and sys.stdin.buffer, which are the underlying binary buffers to stdin and stdout. You can't use sys.stdout and sys.stdin since they're for text. There's a brief Note about this at the end of the docs for sys.stdin and sys.stdout.
这是一个简短的演示.
Here's a short demo.
在"send_bytes.py"中，我们创建一个包含所有可能字节值的bytes字符串data并将其写入sys.stdout.buffer.我们将输出通过管道传输到"get_bytes.py"中进行读取，并检查以确保在正确的位置具有所有正确的字节.
In "send_bytes.py" we create a bytes string data that contains all the possible byte values and write it to sys.stdout.buffer. We pipe that output to "get_bytes.py" where we read it and check to make sure it has all the right bytes in the right places.
#! /usr/bin/env python3
''' Write some binary data to stdout '''
import sys
# Make a bytes string containing all possible byte values
data = bytes(range(256))
#Send it as binary to stdout
out = sys.stdout.buffer
out.write(data)
get_bytes.py
#! /usr/bin/env python3
''' Read some binary data from stdin '''
import sys
#Read binary data from stdin
infile = sys.stdin.buffer
newdata = infile.read()
print(newdata)
# Make a bytes string containing all possible byte values
data = bytes(range(256))
#Check that the read data is correct
print(newdata == data)
我们使用以下命令行运行程序:
We run the programs using this command line:
$ python3 ./send_bytes0.py | python3 ./get_bytes0.py
这是"get_bytes0.py"打印的输出
Here's the output printed by "get_bytes0.py"
b'\x00\x01\x02\x03\x04\x05\x06\x07\x08\t\n\x0b\x0c\r\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f !"#$%&\'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~\x7f\x80\x81\x82\x83\x84\x85\x86\x87\x88\x89\x8a\x8b\x8c\x8d\x8e\x8f\x90\x91\x92\x93\x94\x95\x96\x97\x98\x99\x9a\x9b\x9c\x9d\x9e\x9f\xa0\xa1\xa2\xa3\xa4\xa5\xa6\xa7\xa8\xa9\xaa\xab\xac\xad\xae\xaf\xb0\xb1\xb2\xb3\xb4\xb5\xb6\xb7\xb8\xb9\xba\xbb\xbc\xbd\xbe\xbf\xc0\xc1\xc2\xc3\xc4\xc5\xc6\xc7\xc8\xc9\xca\xcb\xcc\xcd\xce\xcf\xd0\xd1\xd2\xd3\xd4\xd5\xd6\xd7\xd8\xd9\xda\xdb\xdc\xdd\xde\xdf\xe0\xe1\xe2\xe3\xe4\xe5\xe6\xe7\xe8\xe9\xea\xeb\xec\xed\xee\xef\xf0\xf1\xf2\xf3\xf4\xf5\xf6\xf7\xf8\xf9\xfa\xfb\xfc\xfd\xfe\xff'
True
这篇关于在python进程之间传递二进制数据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！
