New submission from Samuel Bayer <[email protected]>:
This bug is probably related to issue 24560.
This:
>>> import subprocess, fcntl, os
>>>> p = subprocess.Popen(["python", "-c", 'import time; time.sleep(5)'], stdin
>>>> = subprocess.PIPE, stdout = subprocess.PIPE, stderr = subprocess.PIPE,
>>>> universal_newlines= True)
>>> fcntl.fcntl(p.stderr.fileno(), fcntl.F_SETFL, os.O_NONBLOCK |
>>> fcntl.fcntl(p.stderr.fileno(), fcntl.F_GETFL))
>>> p.stderr.read()
causes this:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File
"/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/codecs.py",
line 321, in decode
data = self.buffer + input
TypeError: can't concat NoneType to bytes
I'm assuming the problem is that the underlying unbuffered stream returns None
and the incremental byte decoder that's induced by universal_newlines = True
isn't expecting it.
----------
components: IO
messages: 333883
nosy: sambayer
priority: normal
severity: normal
status: open
title: subprocess.Popen with universal_newlines and nonblocking streams failes
with "can't concat NoneType to bytes"
type: crash
versions: Python 3.7
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Python tracker <[email protected]>
<https://bugs.python.org/issue35762>
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