add SEEK_* values to io and/or io.IOBase

[gumpy]

BPO	4572
Nosy	@birkenfeld, @pitrou

^{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 2009-04-01.21:01:02.040>
created_at = <Date 2008-12-07.04:44:22.364>
labels = ['type-feature', 'library']
title = 'add SEEK_* values to io and/or io.IOBase'
updated_at = <Date 2009-04-01.21:01:01.983>
user = 'https://bugs.python.org/gumpy'

bugs.python.org fields:

activity = <Date 2009-04-01.21:01:01.983>
actor = 'georg.brandl'
assignee = 'none'
closed = True
closed_date = <Date 2009-04-01.21:01:02.040>
closer = 'georg.brandl'
components = ['Library (Lib)']
creation = <Date 2008-12-07.04:44:22.364>
creator = 'gumpy'
dependencies = []
files = []
hgrepos = []
issue_num = 4572
keywords = []
message_count = 3.0
messages = ['77213', '78678', '85092']
nosy_count = 3.0
nosy_names = ['georg.brandl', 'pitrou', 'gumpy']
pr_nums = []
priority = 'normal'
resolution = 'accepted'
stage = None
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue4572'
versions = ['Python 3.1', 'Python 2.7']

[gumpy]

Currently io.IOBase.seek(offset[, whence]) uses magic numbers for the
second argument. Since this is essentially identical the C function
fseek I think adding the same "constants" that C uses (SEEK_SET=0,
SEEK_CUR=1, SEEK_END=2) may be worth considering.

These values could be added to the global scope in the io module:
f = io.open('foo', 'rb')
f.seek(0, io.SEEK_END)

If added to the io.IOBase class then I believe they'd be accessible
without importing io:
f = open('foo', 'rb')
f.seek(0, f.SEEK_END)

[pitrou]

Sounds like a nice improvement.

[birkenfeld]

Added in r70992.