[issue10931] print() from pipe enclosed between 'b and 'pair on python3

[ricardw]

New submission from ricardw rica...@intervisit.com:

The following script produces different output on python2.6.6 vs. python3.1.2:
-
import subprocess, sys

ls = subprocess.Popen(['ls', '-l', '/etc/motd'], stdout=subprocess.PIPE,)

end_of_pipe = ls.stdout

print('Result:')

for line in end_of_pipe:
print(line.strip())
-

Result from invoking with python2 and python3 are respectively:

Result:
-rw-rw 1 root root 25 Jan 18 10:25 /etc/motd

and:

Result:
b'-rw-rw 1 root root 25 Jan 18 10:25 /etc/motd'

Is this difference a feature, or a bug ?

--
components: Interpreter Core
messages: 126457
nosy: ricardw
priority: normal
severity: normal
status: open
title: print() from pipe enclosed between 'b and 'pair on python3
type: behavior
versions: Python 3.1

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[issue10931] print() from pipe enclosed between b' and 'pair on python3

[ricardw]

Changes by ricardw rica...@intervisit.com:


--
title: print() from pipe enclosed between 'b and 'pair on python3 - print() 
from pipe enclosed between b' and 'pair on python3

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[issue10931] print() from pipe enclosed between {b'} and {'}-pair on python3

[ricardw]

Changes by ricardw rica...@intervisit.com:


--
title: print() from pipe enclosed between b' and 'nbsp;pair on python3 - 
print() from pipe enclosed between {b'} and {'}-pair on python3

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[issue10931] print() from pipe enclosed between {b'} and {'}-pair on python3

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc amaur...@gmail.com added the comment:

It's a feature. Subprocess output is binary data, not text; and since python3, 
the string type is now what python2 called unicode!

Please read 
http://docs.python.org/py3k/whatsnew/3.0.html#text-vs-data-instead-of-unicode-vs-8-bit
for an explanation of the most important difference between python2 and python3.

--
nosy: +amaury.forgeotdarc
resolution:  - invalid
status: open - closed

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