files, opened in unicode (text): write() returns symbols count, but seek() expect offset in bytes #70036

assignee = None
closed_at = <Date 2017-11-09.17:58:10.838>
created_at = <Date 2015-12-12.20:19:49.560>
labels = ['invalid', 'library', 'expert-unicode', 'expert-IO']
title = 'files, opened in unicode (text): write() returns symbols count, but seek() expect offset in bytes'
updated_at = <Date 2017-11-09.17:58:10.837>
user = 'https://github.com/socketpair'

activity = <Date 2017-11-09.17:58:10.837>
actor = 'serhiy.storchaka'
assignee = 'none'
closed = True
closed_date = <Date 2017-11-09.17:58:10.838>
closer = 'serhiy.storchaka'
components = ['Library (Lib)', 'Unicode', 'IO']
creation = <Date 2015-12-12.20:19:49.560>
creator = 'socketpair'
dependencies = []
files = []
hgrepos = []
issue_num = 25849
keywords = []
message_count = 15.0
messages = ['256291', '256293', '256324', '256329', '256415', '256416', '256417', '256418', '256433', '256440', '256447', '256448', '256551', '256559', '256563']
nosy_count = 6.0
nosy_names = ['pitrou', 'vstinner', 'ezio.melotti', 'r.david.murray', 'socketpair', 'martin.panter']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue25849'
versions = ['Python 3.3', 'Python 3.4', 'Python 3.5', 'Python 3.6']