Duplicate UTF-16 BOM if a file is open in append mode #49256

assignee = None
closed_at = <Date 2009-05-14.18:56:23.019>
created_at = <Date 2009-01-19.23:24:35.284>
labels = []
title = 'Duplicate UTF-16 BOM if a file is open in append mode'
updated_at = <Date 2010-07-28.10:18:37.955>
user = 'https://github.com/vstinner'

activity = <Date 2010-07-28.10:18:37.955>
actor = 'flox'
assignee = 'none'
closed = True
closed_date = <Date 2009-05-14.18:56:23.019>
closer = 'pitrou'
components = []
creation = <Date 2009-01-19.23:24:35.284>
creator = 'vstinner'
dependencies = []
files = ['13421', '13445', '13953']
hgrepos = []
issue_num = 5006
keywords = ['patch']
message_count = 19.0
messages = ['80221', '80223', '80303', '83554', '83834', '84185', '84188', '84193', '84194', '84195', '84319', '84321', '84373', '87554', '87748', '87753', '87754', '109014', '111763']
nosy_count = 8.0
nosy_names = ['lemburg', 'amaury.forgeotdarc', 'pitrou', 'vstinner', 'benjamin.peterson', 'ezio.melotti', 'Conrad.Irwin', 'flox']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue5006'
versions = ['Python 2.6', 'Python 3.0', 'Python 3.1', 'Python 2.7']