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-\chapter{Top-level components\label{top-level}}
-
-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\label{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 \module{sys}
-(various system services), \module{__builtin__} (built-in functions,
-exceptions and \code{None}) and \module{__main__}.  The latter is used
-to provide the local and global namespace for execution of the
-complete program.
-\refbimodindex{sys}
-\refbimodindex{__main__}
-\refbimodindex{__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 namespace of \module{__main__}.
-\index{interactive mode}
-\refbimodindex{__main__}
-
-Under \UNIX, a complete program can be passed to the interpreter in
-three forms: with the \programopt{-c} \var{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\label{file-input}}
-
-All input read from non-interactive files has the same form:
-
-\begin{productionlist}
-  \production{file_input}
-             {(NEWLINE | \token{statement})*}
-\end{productionlist}
-
-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 \function{exec()} function;
-
-\end{itemize}
-
-
-\section{Interactive input\label{interactive}}
-
-Input in interactive mode is parsed using the following grammar:
-
-\begin{productionlist}
-  \production{interactive_input}
-             {[\token{stmt_list}] NEWLINE | \token{compound_stmt} NEWLINE}
-\end{productionlist}
-
-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\label{expression-input}}
-\index{input}
-
-There are two forms of expression input.  Both ignore leading
-whitespace.
-The string argument to \function{eval()} must have the following form:
-\bifuncindex{eval}
-
-\begin{productionlist}
-  \production{eval_input}
-             {\token{expression_list} NEWLINE*}
-\end{productionlist}
-
-The input line read by \function{input()} must have the following form:
-\bifuncindex{input}
-
-\begin{productionlist}
-  \production{input_input}
-             {\token{expression_list} NEWLINE}
-\end{productionlist}
-
-Note: to read `raw' input line without interpretation, you can use the
-the \method{readline()} method of file objects, including \code{sys.stdin}.
-\obindex{file}
-\index{input!raw}
-\withsubitem{(file method)}{\ttindex{readline()}}