[issue15660] In str.format there is a misleading error message about alignment
Terry J. Reedy added the comment:
As I read the docs, the error message is correct and this issue is invalid as a
behavior issue. I read the OP's second message as more or less saying this also.
'='Forces the padding to be placed after the sign (if any) but before the
digits. This is used for printing fields in the form ‘+00120’. This
alignment option is only valid for numeric types.
If the width field is preceded by a zero ('0') character, this enables
zero-padding. This is equivalent to an alignment type of '=' and a fill
character of '0'.
So :02 is equivalent to :0=2, which is invalid.
'{:02d}'.format(1)
'01'
works fine.
I decided make this a doc issue and add for numeric types after this
enables zero-padding before closing this.
--
assignee: - docs@python
components: +Documentation -Interpreter Core
nosy: +docs@python, terry.reedy
versions: +Python 2.7, Python 3.3
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[issue15660] In str.format there is a misleading error message about alignment
Roundup Robot added the comment: New changeset 85cd54b2d3a1 by Terry Jan Reedy in branch '2.7': Issue 15660: Clarify 0 prefix for width field in str.format doc. http://hg.python.org/cpython/rev/85cd54b2d3a1 New changeset 6bc14974024f by Terry Jan Reedy in branch '3.2': Issue 15660: Clarify 0 prefix for width field in str.format doc. http://hg.python.org/cpython/rev/6bc14974024f New changeset f181dd088e63 by Terry Jan Reedy in branch 'default': Merge with 3.2 #15660 http://hg.python.org/cpython/rev/f181dd088e63 -- nosy: +python-dev ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue15660 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue15660] In str.format there is a misleading error message about alignment
Changes by Terry J. Reedy tjre...@udel.edu: -- resolution: - fixed ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue15660 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue15660] In str.format there is a misleading error message about alignment
New submission from py.user:
'{:02}'.format('a')
Traceback (most recent call last):
File stdin, line 1, in module
ValueError: '=' alignment not allowed in string format specifier
according to http://docs.python.org/py3k/library/string.html#formatspec
the default alignment is '' or ''
--
components: Interpreter Core
messages: 168258
nosy: py.user
priority: normal
severity: normal
status: open
title: In str.format there is a misleading error message about alignment
type: behavior
versions: Python 3.2
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[issue15660] In str.format there is a misleading error message about alignment
Changes by Ezio Melotti ezio.melo...@gmail.com: -- nosy: +eric.smith, ezio.melotti stage: - needs patch versions: +Python 2.7, Python 3.3, Python 3.4 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue15660 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue15660] In str.format there is a misleading error message about alignment
py.user added the comment: found a small string in the doc about zero padding, which enables alignment equal to = -- versions: -Python 2.7, Python 3.3, Python 3.4 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue15660 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
