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Diffstat (limited to 'Doc/ref/ref3.tex')
| -rw-r--r-- | Doc/ref/ref3.tex | 35 |
1 files changed, 18 insertions, 17 deletions
diff --git a/Doc/ref/ref3.tex b/Doc/ref/ref3.tex index cb861cd..7cc0762 100644 --- a/Doc/ref/ref3.tex +++ b/Doc/ref/ref3.tex @@ -144,7 +144,6 @@ arithmetic operators and arithmetic built-in functions. Numeric objects are immutable; once created their value never changes. Python numbers are of course strongly related to mathematical numbers, but subject to the limitations of numerical representation in computers. -\obindex{number} \obindex{numeric} Python distinguishes between integers and floating point numbers: @@ -162,7 +161,7 @@ There are two types of integers: These represent numbers in the range -2147483648 through 2147483647. (The range may be larger on machines with a larger natural word size, but not smaller.) -When the result of an operation falls outside this range, the +When the result of an operation would fall outside this range, the exception \exception{OverflowError} is raised. For the purpose of shift and mask operations, integers are assumed to have a binary, 2's complement notation using 32 or more bits, and @@ -221,7 +220,7 @@ number of items of a sequence. When the lenth of a sequence is \var{n}, the index set contains the numbers 0, 1, \ldots, \var{n}-1. Item \var{i} of sequence \var{a} is selected by \code{\var{a}[\var{i}]}. -\obindex{seqence} +\obindex{sequence} \index{index operation} \index{item selection} \index{subscription} @@ -618,7 +617,7 @@ instance dictionary directly. Class instances can pretend to be numbers, sequences, or mappings if they have methods with certain special names. See section \ref{specialnames}, ``Special method names.'' -\obindex{number} +\obindex{numeric} \obindex{sequence} \obindex{mapping} @@ -702,15 +701,14 @@ a number of flags for the interpreter. \ttindex{co_stacksize} \ttindex{co_varnames}} -The following flag bits are defined for \member{co_flags}: bit 2 is set -if the function uses the \samp{*arguments} syntax to accept an -arbitrary number of positional arguments; bit 3 is set if the function -uses the \samp{**keywords} syntax to accept arbitrary keyword -arguments; other bits are used internally or reserved for future use. -If a code object represents a function, the first item in -\member{co_consts} is the documentation string of the -function, or \code{None} if undefined. -\index{documentation string} +The following flag bits are defined for \member{co_flags}: bit +\code{0x04} is set if the function uses the \samp{*arguments} syntax +to accept an arbitrary number of positional arguments; bit +\code{0x08} is set if the function uses the \samp{**keywords} syntax +to accept arbitrary keyword arguments; other bits are used internally +or reserved for future use. If\index{documentation string} a code +object represents a function, the first item in \member{co_consts} is +the documentation string of the function, or \code{None} if undefined. \item[Frame objects] Frame objects represent execution frames. They may occur in traceback @@ -1098,10 +1096,13 @@ three methods. Called to implement evaluation of \code{\var{self}[\var{i}:\var{j}]}. The returned object should be of the same type as \var{self}. Note that missing \var{i} or \var{j} in the slice expression are replaced -by zero or \code{sys.maxint}, respectively, and no further -transformations on the indices is performed. The interpretation of -negative indices and indices larger than the length of the sequence is -up to the method. +by zero or \code{sys.maxint}, respectively. If negative indexes are +used in the slice, the length of the sequence is added to that index. +If the instance does not implement the \method{__len__()} method, an +\exception{AttributeError} is raised. +No guarantee is made that indexes adjusted this way are not still +negative. Indexes which are greater than the length of the sequence +are not modified. \end{methoddesc} \begin{methoddesc}[sequence object]{__setslice__}{self, i, j, sequence} |