conch command with errors triggers TypeError on Python 3

[Craig Rodrigues]

If I do:

conch localhost 'nonexistentcommand'

I get:

Unhandled Error
               Traceback (most recent call last):
                                                   File "/Users/crodrigues/twisted6/src/twisted/python/context.py", line 122, in callWithContext
                                                                                                                                                    return self.currentContext().callWithContext(ctx, func, *args, **kw)
                                                             File "/Users/crodrigues/twisted6/src/twisted/python/context.py", line 85, in callWithContext
                                                                                                                                                             return func(*args,**kw)
                         File "/Users/crodrigues/twisted6/src/twisted/conch/ssh/service.py", line 45, in packetReceived
                                                                                                                           return f(packet)
                                                                                                                                             File "/Users/crodrigues/twisted6/src/twisted/conch/ssh/connection.py", line 273, in ssh_CHANNEL_EXTENDED_DATA
                                                                                                 log.callWithLogger(channel, channel.extReceived, typeCode, data)
    --- <exception caught here> ---
                                     File "/Users/crodrigues/twisted6/src/twisted/python/log.py", line 103, in callWithLogger
                                                                                                                                 return callWithContext({"system": lp}, func, *args, **kw)
                               File "/Users/crodrigues/twisted6/src/twisted/python/log.py", line 86, in callWithContext
                                                                                                                           return context.call({ILogContext: newCtx}, func, *args, **kw)
                             File "/Users/crodrigues/twisted6/src/twisted/python/context.py", line 122, in callWithContext
    return self.currentContext().callWithContext(ctx, func, *args, **kw)
  File "/Users/crodrigues/twisted6/src/twisted/python/context.py", line 85, in callWithContext
    return func(*args,**kw)
  File "/Users/crodrigues/twisted6/src/twisted/conch/scripts/conch.py", line 468, in extReceived
    sys.stderr.write(data)
builtins.TypeError: write() argument must be str, not bytes

[Craig Rodrigues]

​https://github.com/twisted/twisted/pull/937

[Craig Rodrigues]

Approved by wiml: ​https://github.com/twisted/twisted/pull/937#pullrequestreview-105459615

[Craig Rodrigues <rodrigc@…>]

In 8b30594:

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