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#4603: Note that inconsistent tab/space use is now illegal.

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Georg Brandl 2008-12-15 08:43:10 +00:00
parent a3deea1312
commit 861ac1fbaf
1 changed files with 10 additions and 6 deletions
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Doc/reference/lexical_analysis.rst
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@ -174,14 +174,18 @@ Leading whitespace (spaces and tabs) at the beginning of a logical line is used
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