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"exec" is now a statement. execfile() is obsolete. 

(Also added a stub for "access".)
This commit is contained in:
Guido van Rossum 1993-10-18 17:59:42 +00:00
parent db3165e655
commit a75d306e2b
2 changed files with 78 additions and 0 deletions
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39
Doc/ref/ref6.tex
View File

@ -17,6 +17,8 @@ simple_stmt: expression_stmt
| continue_stmt
| import_stmt
| global_stmt
| access_stmt
| exec_stmt
\end{verbatim}
\section{Expression statements}
@ -466,3 +468,40 @@ definition, function definition, or \verb\import\ statement.
restrictions, but programs should not abuse this freedom, as future
implementations may enforce them or silently change the meaning of the
program.)
\section{The {\tt access} statement} \label{access}
\stindex{access}
\begin{verbatim}
access_stmt: "access" ...
\end{verbatim}
This statement will be used in the future to control access to
instance and class variables. Currently its syntax and effects are
undefined; however the keyword \verb\access\ is a reserved word for
the parser.
\section{The {\tt exec} statement} \label{exec}
\stindex{exec}
\begin{verbatim}
exec_stmt: "exec" expression ["in" expression ["," expression]]
\end{verbatim}
This statement supports dynamic execution of Python code. The first
expression should evaluate to either a string, an open file object, or
a code object. If it is a string, the string is parsed as a suite of
Python statements which is then executed (unless a syntax error
occurs). If it is an open file, the file is parsed until EOF and
executed. If it is a code object, it is simply executed.
In all cases, if the optional parts are omitted, the code is executed
in the current scope. If only the first expression after \verb\in\ is
specified, it should be a dictionary, which will be used for both the
global and the local variables. If two expressions are given, both
must be dictionaries and they are used for the global and local
variables, respectively.
Note: dynamic evaluation of expressions is supported by the built-in
function \verb\eval\.

39
Doc/ref6.tex
View File

@ -17,6 +17,8 @@ simple_stmt: expression_stmt
| continue_stmt
| import_stmt
| global_stmt
| access_stmt
| exec_stmt
\end{verbatim}
\section{Expression statements}
@ -466,3 +468,40 @@ definition, function definition, or \verb\import\ statement.
restrictions, but programs should not abuse this freedom, as future
implementations may enforce them or silently change the meaning of the
program.)
\section{The {\tt access} statement} \label{access}
\stindex{access}
\begin{verbatim}
access_stmt: "access" ...
\end{verbatim}
This statement will be used in the future to control access to
instance and class variables. Currently its syntax and effects are
undefined; however the keyword \verb\access\ is a reserved word for
the parser.
\section{The {\tt exec} statement} \label{exec}
\stindex{exec}
\begin{verbatim}
exec_stmt: "exec" expression ["in" expression ["," expression]]
\end{verbatim}
This statement supports dynamic execution of Python code. The first
expression should evaluate to either a string, an open file object, or
a code object. If it is a string, the string is parsed as a suite of
Python statements which is then executed (unless a syntax error
occurs). If it is an open file, the file is parsed until EOF and
executed. If it is a code object, it is simply executed.
In all cases, if the optional parts are omitted, the code is executed
in the current scope. If only the first expression after \verb\in\ is
specified, it should be a dictionary, which will be used for both the
global and the local variables. If two expressions are given, both
must be dictionaries and they are used for the global and local
variables, respectively.
Note: dynamic evaluation of expressions is supported by the built-in
function \verb\eval\.