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SF bug #1190451: 6.9 First sentence is confusing 

* Fixed incorrect wording:  expression->exception
* Noted the specific exception reported by "raise" when the is nothing
  to re-raise.
* Eliminated several instances of "e.g." as recommended in the style guide.
This commit is contained in:
Raymond Hettinger 2005-04-28 07:18:47 +00:00
parent e8dead47e6
commit b56b494bea
1 changed files with 8 additions and 7 deletions
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15
Doc/ref/ref6.tex
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@ -204,12 +204,12 @@ attribute; if it cannot perform the assignment, it raises an exception
\item
If the target is a subscription: The primary expression in the
reference is evaluated. It should yield either a mutable sequence
object (e.g., a list) or a mapping object (e.g., a dictionary). Next,
object (such as a list) or a mapping object (such as a dictionary). Next,
the subscript expression is evaluated.
\indexii{subscription}{assignment}
\obindex{mutable}
If the primary is a mutable sequence object (e.g., a list), the subscript
If the primary is a mutable sequence object (such as a list), the subscript
must yield a plain integer. If it is negative, the sequence's length
is added to it. The resulting value must be a nonnegative integer
less than the sequence's length, and the sequence is asked to assign
@ -219,7 +219,7 @@ sequence cannot add new items to a list).
\obindex{sequence}
\obindex{list}
If the primary is a mapping object (e.g., a dictionary), the subscript must
If the primary is a mapping object (such as a dictionary), the subscript must
have a type compatible with the mapping's key type, and the mapping is
then asked to create a key/datum pair which maps the subscript to
the assigned object. This can either replace an existing key/value
@ -230,7 +230,7 @@ key with the same value existed).
\item
If the target is a slicing: The primary expression in the reference is
evaluated. It should yield a mutable sequence object (e.g., a list). The
evaluated. It should yield a mutable sequence object (such as a list). The
assigned object should be a sequence object of the same type. Next,
the lower and upper bound expressions are evaluated, insofar they are
present; defaults are zero and the sequence's length. The bounds
@ -251,7 +251,7 @@ during the code generation phase, causing less detailed error
messages.)
WARNING: Although the definition of assignment implies that overlaps
between the left-hand side and the right-hand side are `safe' (e.g.,
between the left-hand side and the right-hand side are `safe' (for example
\samp{a, b = b, a} swaps two variables), overlaps \emph{within} the
collection of assigned-to variables are not safe! For instance, the
following program prints \samp{[0, 2]}:
@ -523,8 +523,9 @@ from __future__ import generators
\end{productionlist}
If no expressions are present, \keyword{raise} re-raises the last
expression that was active in the current scope. If no exception is
active in the current scope, an exception is raised indicating this error.
exception that was active in the current scope. If no exception is
active in the current scope, a \exception{Queue.Empty} exception is
raised indicating this error.
\index{exception}
\indexii{raising}{exception}