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| -rw-r--r-- | Doc/reference/lexical_analysis.rst | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/Doc/reference/lexical_analysis.rst b/Doc/reference/lexical_analysis.rst index 1e43128..83d3b8b 100644 --- a/Doc/reference/lexical_analysis.rst +++ b/Doc/reference/lexical_analysis.rst @@ -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 |