diff options
Diffstat (limited to 'Doc/ref/ref4.tex')
| -rw-r--r-- | Doc/ref/ref4.tex | 28 |
1 files changed, 13 insertions, 15 deletions
diff --git a/Doc/ref/ref4.tex b/Doc/ref/ref4.tex index 91713f9..8366a5f 100644 --- a/Doc/ref/ref4.tex +++ b/Doc/ref/ref4.tex @@ -24,9 +24,9 @@ command (a command specified on the interpreter command line with the `\strong{-c}' option) is a code block. The file read by the built-in function \function{execfile()} is a code block. The string argument passed to the built-in function \function{eval()} and to the -\keyword{exec} statement is a code block. And finally, the expression -read and evaluated by the built-in function \function{input()} is a -code block. +\keyword{exec}\stindex{exec} statement is a code block. And finally, +the expression read and evaluated by the built-in function +\function{input()} is a code block. A code block is executed in an execution frame. An \dfn{execution frame}\indexii{execution}{frame} contains some administrative @@ -86,10 +86,11 @@ occurring as the target of an assignment, in a \keyword{for} loop header Whether a name is local or global in a code block is determined by static inspection of the source text for the code block: in the -absence of \keyword{global} statements, a name that is bound anywhere -in the code block is local in the entire code block; all other names -are considered global. The \keyword{global} statement forces global -interpretation of selected names throughout the code block. +absence of \keyword{global}\stindex{global} statements, a name that is +bound anywhere in the code block is local in the entire code block; +all other names are considered global. The \keyword{global} statement +forces global interpretation of selected names throughout the code +block. The following constructs bind names: formal parameters to functions, \keyword{import} statements, class and function definitions (these @@ -97,9 +98,9 @@ bind the class or function name in the defining block), and targets that are identifiers if occurring in an assignment, \keyword{for} loop header, or in the second position of an \keyword{except} clause header. The \keyword{import} statement of the form ``\samp{from -\ldots import *}'' binds all names defined in the imported module, -except those beginning with an underscore. This form may only be used -at the module level. +\ldots import *}''\stindex{from} binds all names defined in the +imported module, except those beginning with an underscore. This form +may only be used at the module level. A target occurring in a \keyword{del} statement is also considered bound for this purpose (though the actual semantics are to unbind the @@ -110,15 +111,12 @@ When a global name is not found in the global namespace, it is searched in the built-in namespace (which is actually the global namespace of the module \module{__builtin__}\refbimodindex{__builtin__}). The built-in namespace associated with the execution of a code block -is actually found by looking up the name \code{__builtins__} is its +is actually found by looking up the name \code{__builtins__} in its global namespace; this should be a dictionary or a module (in the -latter case its dictionary is used). Normally, the +latter case the module's dictionary is used). Normally, the \code{__builtins__} namespace is the dictionary of the built-in module \module{__builtin__} (note: no `s'). If it isn't, restricted execution\indexii{restricted}{execution} mode is in effect. -\stindex{from} -\stindex{exec} -\stindex{global} The namespace for a module is automatically created the first time a module is imported. The main module for a script is always called |