Python 无法将字节连接到 str
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Can't concat bytes to str
提问by AndroidDev
This is proving to be a rough transition over to python. What is going on here?:
事实证明，这是向 Python 的粗略过渡。这里发生了什么？：
f = open( 'myfile', 'a+' )
f.write('test string' + '\n')
key = "pass:hello"
plaintext = subprocess.check_output(['openssl', 'aes-128-cbc', '-d', '-in', test, '-base64', '-pass', key])
print (plaintext)
f.write (plaintext + '\n')
f.close()
The output file looks like:
输出文件如下所示：
test string
test string
and then I get this error:
然后我收到这个错误：
b'decryption successful\n'
Traceback (most recent call last):
File ".../Project.py", line 36, in <module>
f.write (plaintext + '\n')
TypeError: can't concat bytes to str
采纳答案by Wooble
subprocess.check_output()returns a bytestring.
subprocess.check_output()返回一个字节串。
In Python 3, there's no implicit conversion between unicode (str) objects and bytesobjects. If you know the encoding of the output, you can .decode()it to get a string, or you can turn the \nyou want to add to byteswith "\n".encode('ascii')
在 Python 3 中，unicode ( str) 对象和bytes对象之间没有隐式转换。如果你知道输出的编码，就可以.decode()它来得到一个字符串，或者你可以把\n你想要添加到bytes与"\n".encode('ascii')
回答by HISI
subprocess.check_output() returns bytes.
subprocess.check_output() 返回字节。
so you need to convert '\n' to bytes as well:
所以你还需要将 '\n' 转换为字节：
f.write (plaintext + b'\n')
hope this helps
希望这可以帮助
回答by gcs
You can convert type of plaintextto string:
您可以将类型转换plaintext为字符串：
f.write(str(plaintext) + '\n')
