TextIOWrapper.seekable() always returns False

[netzhen]

BPO	2282
Nosy	@gvanrossum
Files	issue2282.diff: Fixes the seekable method and adds a test.

^{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 = None
closed_at = <Date 2008-03-17.20:35:52.847>
created_at = <Date 2008-03-13.04:32:29.745>
labels = ['type-feature', 'library']
title = 'TextIOWrapper.seekable() always returns False'
updated_at = <Date 2008-03-17.20:35:52.846>
user = 'https://bugs.python.org/netzhen'

bugs.python.org fields:

activity = <Date 2008-03-17.20:35:52.846>
actor = 'ping'
assignee = 'ping'
closed = True
closed_date = <Date 2008-03-17.20:35:52.847>
closer = 'ping'
components = ['Library (Lib)']
creation = <Date 2008-03-13.04:32:29.745>
creator = 'netzhen'
dependencies = []
files = ['9690']
hgrepos = []
issue_num = 2282
keywords = ['patch']
message_count = 4.0
messages = ['63494', '63660', '63663', '63762']
nosy_count = 4.0
nosy_names = ['gvanrossum', 'ping', 'jeff.balogh', 'netzhen']
pr_nums = []
priority = 'high'
resolution = 'accepted'
stage = None
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue2282'
versions = ['Python 3.0']

[netzhen]

The seekable() method of TextIOWrapper always returns False, for it
does't override the seekable method of IOBase class in which just
returns False. But, there is a method named _seekable(self) in
TextIOWrapper(in io.py line 1211):
def _seekable(self):
return self._seekable
which should be seekable(self), and _seekable method is overwrited by
line 1190 in the __init__ method as a bool object:
self._seekable = self._telling = self.buffer.seekable()

[jeffbalogh]

Attaching a patch that fixes this issue and adds a regression test.

[gvanrossum]

Confirmed. Ping, since you're looking at io.py anyway, can you fix this
too?

[ping]

Patch committed.