update format() documentation and tutorial #51062

assignee = 'https://github.com/birkenfeld'
closed_at = <Date 2009-09-01.07:43:05.479>
created_at = <Date 2009-09-01.04:05:04.998>
labels = ['docs']
title = 'update format() documentation and tutorial'
updated_at = <Date 2009-09-01.08:51:58.561>
user = 'https://bugs.python.org/grooverdan'

activity = <Date 2009-09-01.08:51:58.561>
actor = 'eric.smith'
assignee = 'georg.brandl'
closed = True
closed_date = <Date 2009-09-01.07:43:05.479>
closer = 'georg.brandl'
components = ['Documentation']
creation = <Date 2009-09-01.04:05:04.998>
creator = 'grooverdan'
dependencies = []
files = ['14812']
hgrepos = []
issue_num = 6813
keywords = ['patch']
message_count = 4.0
messages = ['92119', '92122', '92135', '92136']
nosy_count = 3.0
nosy_names = ['georg.brandl', 'eric.smith', 'grooverdan']
pr_nums = []
priority = 'normal'
resolution = 'accepted'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue6813'
versions = ['Python 3.1', 'Python 3.2']