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3.0 document tab interpretation change #48853

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terryjreedy opened this issue Dec 8, 2008 · 2 comments
Closed

3.0 document tab interpretation change #48853

terryjreedy opened this issue Dec 8, 2008 · 2 comments
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@birkenfeld
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@terryjreedy
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BPO 4603
Nosy @birkenfeld, @terryjreedy

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 = 'https://github.com/birkenfeld'
closed_at = <Date 2008-12-15.08:50:01.824>
created_at = <Date 2008-12-08.23:05:50.347>
labels = ['docs']
title = '3.0 document tab interpretation change'
updated_at = <Date 2008-12-15.08:50:01.823>
user = 'https://github.com/terryjreedy'

bugs.python.org fields:

activity = <Date 2008-12-15.08:50:01.823>
actor = 'georg.brandl'
assignee = 'georg.brandl'
closed = True
closed_date = <Date 2008-12-15.08:50:01.824>
closer = 'georg.brandl'
components = ['Documentation']
creation = <Date 2008-12-08.23:05:50.347>
creator = 'terry.reedy'
dependencies = []
files = []
hgrepos = []
issue_num = 4603
keywords = []
message_count = 2.0
messages = ['77360', '77852']
nosy_count = 2.0
nosy_names = ['georg.brandl', 'terry.reedy']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue4603'
versions = ['Python 3.0', 'Python 3.1']
@terryjreedy
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In 2.6, Ref Manual / Lexical Analysis / Indentation says

"First, tabs are replaced (from left to right) by one to eight spaces
such that the total number of characters up to and including the
replacement is a multiple of eight (this is intended to be the same rule
as used by Unix). The total number of spaces preceding the first
non-blank character then determines the line’s indentation. "

and Using Python / Command line / Misc options says

"-t
Issue a warning when a source file mixes tabs and spaces for
indentation in a way that makes it depend on the worth of a tab
expressed in spaces. Issue an error when the option is given twice (-tt)."

Inyeol Lee, on c.l.p., in response to a report of a TabError, says "-tt
option in python 2.x is now default in python 3.0.
Apparently it got slipped from any documentation, including what's
new."

In 3.0 docs, the -t option *was* removed from Using Python, but the
Indentation sentences quoted above remain unchanged, though obsolete. I
would guess that they should be replaced by something like

"When a source file mixes tabs and spaces for indentation in a way that
makes it depend on the worth of a tab expressed in spaces, a TabError is
raised."

Perhaps What's New should get a sentence too. "The former -tt startup
option to raise TabError on ambiguous mixtures of tabs and spaces for
indentation has been removed as an option and is now the standard behavior."

@terryjreedy terryjreedy added the docs Documentation in the Doc dir label Dec 8, 2008
@birkenfeld
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Thanks, fixed in r67786.

@ezio-melotti ezio-melotti transferred this issue from another repository Apr 10, 2022
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