sys.stdin.fileno() gives attribute error in IDLE

[markveldhuis]

BPO	3003
Nosy	@kbkaiser, @devdanzin

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/kbkaiser'
closed_at = <Date 2009-05-18.05:10:00.616>
created_at = <Date 2008-05-29.16:43:55.249>
labels = ['expert-IDLE', 'type-bug']
title = 'sys.stdin.fileno() gives attribute error in IDLE'
updated_at = <Date 2009-05-18.05:10:00.497>
user = 'https://bugs.python.org/markveldhuis'

bugs.python.org fields:

activity = <Date 2009-05-18.05:10:00.497>
actor = 'kbk'
assignee = 'kbk'
closed = True
closed_date = <Date 2009-05-18.05:10:00.616>
closer = 'kbk'
components = ['IDLE']
creation = <Date 2008-05-29.16:43:55.249>
creator = 'markveldhuis'
dependencies = []
files = []
hgrepos = []
issue_num = 3003
keywords = []
message_count = 3.0
messages = ['67503', '86614', '88015']
nosy_count = 4.0
nosy_names = ['kbk', 'ajaksu2', 'gpolo', 'markveldhuis']
pr_nums = []
priority = 'normal'
resolution = 'works for me'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue3003'
versions = ['Python 2.6']

[markveldhuis]

I am using IDLE on Ubuntu Hardy (8.04) and all in all very content to
use it. Today I got an AttributeError using sys.stdin.fileno(). A closer
look revealed this:

in IDLE:

Python 2.5.2 (r252:60911, Apr 21 2008, 11:12:42)
[GCC 4.2.3 (Ubuntu 4.2.3-2ubuntu7)] on linux2
Type "copyright", "credits" or "license()" for more information.

    ****************************************************************
    Personal firewall software may warn about the connection IDLE
    makes to its subprocess using this computer's internal loopback
    interface.  This connection is not visible on any external
    interface and no data is sent to or received from the Internet.
    ****************************************************************
    
IDLE 1.2.2      
>>> import sys
>>> dir(sys.stdin)
['_RPCProxy__attributes', '_RPCProxy__getattributes',
'_RPCProxy__getmethods', '_RPCProxy__methods', '__class__',
'__delattr__', '__dict__', '__doc__', '__getattr__', '__getattribute__',
'__hash__', '__init__', '__module__', '__new__', '__reduce__',
'__reduce_ex__', '__repr__', '__setattr__', '__str__', '__weakref__',
'encoding', 'oid', 'sockio']
>>> 

in terminal:

:~$ python
Python 2.5.2 (r252:60911, Apr 21 2008, 11:12:42) 
[GCC 4.2.3 (Ubuntu 4.2.3-2ubuntu7)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> dir(sys.stdin)
['__class__', '__delattr__', '__doc__', '__enter__', '__exit__',
'__getattribute__', '__hash__', '__init__', '__iter__', '__new__',
'__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__str__',
'close', 'closed', 'encoding', 'fileno', 'flush', 'isatty', 'mode',
'name', 'newlines', 'next', 'read', 'readinto', 'readline', 'readlines',
'seek', 'softspace', 'tell', 'truncate', 'write', 'writelines',
'xreadlines']
>>> 

I expected to see more or less the same output, is that right? I could
not find information on this online, so I report it as a bug.

greetings, Mark

[devdanzin]

I think this isn't a bug, but an implementation detail. Guilherme?

[kbkaiser]

>>> type(sys.stdin)
<class 'idlelib.rpc.RPCProxy'>

Don't attempt sys.stdin._RPCProxy_methods lest you be turned to
stone ;-)

We didn't implement all the features of stdin as it didn't seem
necessary. Did you have a specific reason to access
stdin.fileno() ?

stdin/out/err support communications between the subprocess and
the IDLE GUI through a socket. They are redirected in the GUI and
proxied in the subprocess.