diff options
Diffstat (limited to 'Doc/ref/ref8.tex')
-rw-r--r-- | Doc/ref/ref8.tex | 105 |
1 files changed, 0 insertions, 105 deletions
diff --git a/Doc/ref/ref8.tex b/Doc/ref/ref8.tex deleted file mode 100644 index a9e688a..0000000 --- a/Doc/ref/ref8.tex +++ /dev/null @@ -1,105 +0,0 @@ -\chapter{Top-level components} - -The Python interpreter can get its input from a number of sources: -from a script passed to it as standard input or as program argument, -typed in interactively, from a module source file, etc. This chapter -gives the syntax used in these cases. -\index{interpreter} - -\section{Complete Python programs} -\index{program} - -While a language specification need not prescribe how the language -interpreter is invoked, it is useful to have a notion of a complete -Python program. A complete Python program is executed in a minimally -initialized environment: all built-in and standard modules are -available, but none have been initialized, except for \verb@sys@ -(various system services), \verb@__builtin__@ (built-in functions, -exceptions and \verb@None@) and \verb@__main__@. The latter is used -to provide the local and global name space for execution of the -complete program. -\bimodindex{sys} -\bimodindex{__main__} -\bimodindex{__builtin__} - -The syntax for a complete Python program is that for file input, -described in the next section. - -The interpreter may also be invoked in interactive mode; in this case, -it does not read and execute a complete program but reads and executes -one statement (possibly compound) at a time. The initial environment -is identical to that of a complete program; each statement is executed -in the name space of \verb@__main__@. -\index{interactive mode} -\bimodindex{__main__} - -Under {\UNIX}, a complete program can be passed to the interpreter in -three forms: with the {\bf -c} {\it string} command line option, as a -file passed as the first command line argument, or as standard input. -If the file or standard input is a tty device, the interpreter enters -interactive mode; otherwise, it executes the file as a complete -program. -\index{UNIX} -\index{command line} -\index{standard input} - -\section{File input} - -All input read from non-interactive files has the same form: - -\begin{verbatim} -file_input: (NEWLINE | statement)* -\end{verbatim} - -This syntax is used in the following situations: - -\begin{itemize} - -\item when parsing a complete Python program (from a file or from a string); - -\item when parsing a module; - -\item when parsing a string passed to the \verb@exec@ statement; - -\end{itemize} - -\section{Interactive input} - -Input in interactive mode is parsed using the following grammar: - -\begin{verbatim} -interactive_input: [stmt_list] NEWLINE | compound_stmt NEWLINE -\end{verbatim} - -Note that a (top-level) compound statement must be followed by a blank -line in interactive mode; this is needed to help the parser detect the -end of the input. - -\section{Expression input} -\index{input} - -There are two forms of expression input. Both ignore leading -whitespace. - -The string argument to \verb@eval()@ must have the following form: -\bifuncindex{eval} - -\begin{verbatim} -eval_input: condition_list NEWLINE* -\end{verbatim} - -The input line read by \verb@input()@ must have the following form: -\bifuncindex{input} - -\begin{verbatim} -input_input: condition_list NEWLINE -\end{verbatim} - -Note: to read `raw' input line without interpretation, you can use the -built-in function \verb@raw_input()@ or the \verb@readline()@ method -of file objects. -\obindex{file} -\index{input!raw} -\index{raw input} -\bifuncindex{raw_index} -\ttindex{readline} |