New submission from Alex:
Regardless of the value of `encoding`, StreamReaders returned for the
`asyncio.subprocess.Process`'s `stdout` and `stderr` would be in binary mode.
import sys
import asyncio
import subprocess
async def main():
sp = await asyncio.create_subprocess_exec('ls', '-la',
stdin=None,
stdout=subprocess.PIPE,
encoding='utf8')
await sp.wait()
data = await sp.stdout.read()
print(data)
print(isinstance(data, bytes))
loop = asyncio.get_event_loop()
loop.run_until_complete(main())
There are two naive solutions:
- `create_subprocess_*` could explicitly raise when provided any `encoding` and
`errors` (like it now does with `universal_newlines`).
- or implement encoding conversions for StreamReaders (and StreamWriters), and
forward those.
Of course it would be better to have conversions, but I don't know how those
will have to deal with decoding partially available data - e.g. returning in
the middle of surrogate pair, or having only half a codepoint for UTF16. There
should likely cache partial data to process at the next read, but this would
require rewriting codecs to support partial decode... seems like it's not that
easy :(
----------
messages: 299537
nosy: toriningen
priority: normal
severity: normal
status: open
title: asyncio.create_subprocess_* do not honor `encoding`
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Python tracker <[email protected]>
<http://bugs.python.org/issue31087>
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