期望在python3中抛出错误为“必须在str中，而不是字节”

Question

我正在将我的代码迁移到python 3.4.3。 这段代码在python 2.4.3中工作正常。 但这里它在python 3.4.3中抛出错误。 我应该使用与预期不同的东西吗？ 这是我的代码片段，它会收到错误：

   telconn=pexpect.spawn('telnet 10.24.12.83')
    telconn.logfile = sys.stdout
    login=telconn.expect([":","key to proceed.",">"])
    if login==0:
        telconn.send("user1" + "\r")
        telconn.expect(":")
        telconn.send("paswd1" + "\r\r\r\r\n\n\n")
        login1=telconn.expect([">","key to proceed."])
        if login1==0:
            print("nothing")
        elif login1==1:
            telconn.expect("key to proceed.")
            telconn.send ("\003")
            telconn.expect(">")
    if login==1:
        telconn.send ("\003")
        telconn.expect(">")
        print("ctlc")
    elif login==2:
        telconn.send("\n\r")
        telconn.expect(">")

我得到的错误是：

Traceback (most recent call last):
  File "cleanup1.py", line 128, in <module>
    Connect()
  File "cleanup1.py", line 53, in Connect
    login=telconn.expect([":","key to proceed.",">"])
  File "/corp/global/install-dependent/python/3.4.3/lib/python3.4/site-packages/pexpect/spawnbase.py", line 315, in expect
    timeout, searchwindowsize, async)
  File "/corp/global/install-dependent/python/3.4.3/lib/python3.4/site-packages/pexpect/spawnbase.py", line 339, in expect_list
    return exp.expect_loop(timeout)
  File "/corp/global/install-dependent/python/3.4.3/lib/python3.4/site-packages/pexpect/expect.py", line 97, in expect_loop
    incoming = spawn.read_nonblocking(spawn.maxread, timeout)
  File "/corp/global/install-dependent/python/3.4.3/lib/python3.4/site-packages/pexpect/pty_spawn.py", line 455, in read_nonblocking
    return super(spawn, self).read_nonblocking(size)
  File "/corp/global/install-dependent/python/3.4.3/lib/python3.4/site-packages/pexpect/spawnbase.py", line 157, in read_nonblocking
    self._log(s, 'read')
  File "/corp/global/install-dependent/python/3.4.3/lib/python3.4/site-packages/pexpect/spawnbase.py", line 115, in _log
    self.logfile.write(s)
TypeError: must be str, not bytes

Answer 1

pexpect想记录字节，而不是解码字符串。 你可以让它做到这一点：

telconn.logfile = sys.stdout.buffer

sys.stdout默认为期待字符串。 内部缓冲区很满意字节。

Answer 2

接受的答案是正确的，因为您当前正在尝试记录字节而不是字符串。 但至少从pexpect版本4.6开始，您可以为spawn提供encoding参数 。 所以使用：

telconn=pexpect.spawn('telnet 10.24.12.83', encoding='utf-8')

然后使用utf-8自动解码与生成的终端的所有通信，并且您将能够使用telconn.logfile = sys.stdout 。

Answer 3

在此错误报告中，您应该使用spawnu而不是spawn来编写unicode而不是字节。 您可能不知道spawn使用二进制日志文件，而spawnu使用unicode日志文件。

Answer 4

将第53行更改为

login1=telconn.expect(">"+"key to proceed.")