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New restriction on pow(x, y, z): If z is not None, x and y must be of

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integer types, and y must be >= 0.  See discussion at
http://sf.net/tracker/index.php?func=detail&aid=457066&group_id=5470&atid=105470
This commit is contained in:
Tim Peters 2001-09-03 08:35:41 +00:00
parent 5d2b77cf31
commit 32f453eaa4
9 changed files with 79 additions and 49 deletions
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18
Doc/lib/libfuncs.tex
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@ -118,7 +118,7 @@ class instances are callable if they have a \method{__call__()} method.
operations.
\end{funcdesc}
\begin{funcdesc}{compile}{string, filename, kind\optional{,
\begin{funcdesc}{compile}{string, filename, kind\optional{,
flags\optional{, dont_inherit}}}
Compile the \var{string} into a code object. Code objects can be
executed by an \keyword{exec} statement or evaluated by a call to
@ -408,7 +408,7 @@ raised.
\begin{funcdesc}{locals}{}
Return a dictionary representing the current local symbol table.
\strong{Warning:} The contents of this dictionary should not be
modified; changes may not affect the values of local variables used by
modified; changes may not affect the values of local variables used by
the interpreter.
\end{funcdesc}
@ -478,7 +478,7 @@ the interpreter.
ignored). If the file cannot be opened, \exception{IOError} is
raised.
If \var{mode} is omitted, it defaults to \code{'r'}. When opening a
If \var{mode} is omitted, it defaults to \code{'r'}. When opening a
binary file, you should append \code{'b'} to the \var{mode} value
for improved portability. (It's useful even on systems which don't
treat binary and text files differently, where it serves as
@ -519,8 +519,14 @@ the interpreter.
case, all arguments are converted to float and a float result is
delivered. For example, \code{10**2} returns \code{100}, but
\code{10**-2} returns \code{0.01}. (This last feature was added in
Python 2.2. In Python 2.1 and before, a negative second argument
would raise an exception.)
Python 2.2. In Python 2.1 and before, if both arguments were of integer
types and the second argument was negative, an exception was raised.)
If the second argument is negative, the third argument must be omitted.
If \var{z} is present, \var{x} and \var{y} must be of integer types,
and \var{y} must be non-negative. (This restriction was added in
Python 2.2. In Python 2.1 and before, floating 3-argument \code{pow()}
returned platform-dependent results depending on floating-point
rounding accidents.)
\end{funcdesc}
\begin{funcdesc}{range}{\optional{start,} stop\optional{, step}}
@ -731,7 +737,7 @@ returns a dictionary corresponding to the object's symbol table.
The returned dictionary should not be modified: the effects on the
corresponding symbol table are undefined.\footnote{
In the current implementation, local variable bindings cannot
normally be affected this way, but variables retrieved from
normally be affected this way, but variables retrieved from
other scopes (such as modules) can be. This may change.}
\end{funcdesc}