[Python-checkins] r67786 - python/branches/py3k/Doc/reference/lexical_analysis.rst
georg.brandl
python-checkins at python.org
Mon Dec 15 09:43:10 CET 2008
Author: georg.brandl
Date: Mon Dec 15 09:43:10 2008
New Revision: 67786
Log:
#4603: Note that inconsistent tab/space use is now illegal.
Modified:
python/branches/py3k/Doc/reference/lexical_analysis.rst
Modified: python/branches/py3k/Doc/reference/lexical_analysis.rst
==============================================================================
--- python/branches/py3k/Doc/reference/lexical_analysis.rst (original)
+++ python/branches/py3k/Doc/reference/lexical_analysis.rst Mon Dec 15 09:43:10 2008
@@ -174,14 +174,18 @@
to compute the indentation level of the line, which in turn is used to determine
the grouping of statements.
-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. Indentation cannot be split over multiple physical lines
-using backslashes; the whitespace up to the first backslash determines the
+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. Indentation cannot be split over multiple physical lines using
+backslashes; the whitespace up to the first backslash determines the
indentation.
+Indentation is rejected as inconsistent if a source file mixes tabs and spaces
+in a way that makes the meaning dependent on the worth of a tab in spaces; a
+:exc:`TabError` is raised in that case.
+
**Cross-platform compatibility note:** because of the nature of text editors on
non-UNIX platforms, it is unwise to use a mixture of spaces and tabs for the
indentation in a single source file. It should also be noted that different
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