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+
+:mod:`code` --- Interpreter base classes
+========================================
+
+.. module:: code
+ :synopsis: Facilities to implement read-eval-print loops.
+
+
+
+The ``code`` module provides facilities to implement read-eval-print loops in
+Python. Two classes and convenience functions are included which can be used to
+build applications which provide an interactive interpreter prompt.
+
+
+.. class:: InteractiveInterpreter([locals])
+
+ This class deals with parsing and interpreter state (the user's namespace); it
+ does not deal with input buffering or prompting or input file naming (the
+ filename is always passed in explicitly). The optional *locals* argument
+ specifies the dictionary in which code will be executed; it defaults to a newly
+ created dictionary with key ``'__name__'`` set to ``'__console__'`` and key
+ ``'__doc__'`` set to ``None``.
+
+
+.. class:: InteractiveConsole([locals[, filename]])
+
+ Closely emulate the behavior of the interactive Python interpreter. This class
+ builds on :class:`InteractiveInterpreter` and adds prompting using the familiar
+ ``sys.ps1`` and ``sys.ps2``, and input buffering.
+
+
+.. function:: interact([banner[, readfunc[, local]]])
+
+ Convenience function to run a read-eval-print loop. This creates a new instance
+ of :class:`InteractiveConsole` and sets *readfunc* to be used as the
+ :meth:`raw_input` method, if provided. If *local* is provided, it is passed to
+ the :class:`InteractiveConsole` constructor for use as the default namespace for
+ the interpreter loop. The :meth:`interact` method of the instance is then run
+ with *banner* passed as the banner to use, if provided. The console object is
+ discarded after use.
+
+
+.. function:: compile_command(source[, filename[, symbol]])
+
+ This function is useful for programs that want to emulate Python's interpreter
+ main loop (a.k.a. the read-eval-print loop). The tricky part is to determine
+ when the user has entered an incomplete command that can be completed by
+ entering more text (as opposed to a complete command or a syntax error). This
+ function *almost* always makes the same decision as the real interpreter main
+ loop.
+
+ *source* is the source string; *filename* is the optional filename from which
+ source was read, defaulting to ``'<input>'``; and *symbol* is the optional
+ grammar start symbol, which should be either ``'single'`` (the default) or
+ ``'eval'``.
+
+ Returns a code object (the same as ``compile(source, filename, symbol)``) if the
+ command is complete and valid; ``None`` if the command is incomplete; raises
+ :exc:`SyntaxError` if the command is complete and contains a syntax error, or
+ raises :exc:`OverflowError` or :exc:`ValueError` if the command contains an
+ invalid literal.
+
+
+.. _interpreter-objects:
+
+Interactive Interpreter Objects
+-------------------------------
+
+
+.. method:: InteractiveInterpreter.runsource(source[, filename[, symbol]])
+
+ Compile and run some source in the interpreter. Arguments are the same as for
+ :func:`compile_command`; the default for *filename* is ``'<input>'``, and for
+ *symbol* is ``'single'``. One several things can happen:
+
+ * The input is incorrect; :func:`compile_command` raised an exception
+ (:exc:`SyntaxError` or :exc:`OverflowError`). A syntax traceback will be
+ printed by calling the :meth:`showsyntaxerror` method. :meth:`runsource`
+ returns ``False``.
+
+ * The input is incomplete, and more input is required; :func:`compile_command`
+ returned ``None``. :meth:`runsource` returns ``True``.
+
+ * The input is complete; :func:`compile_command` returned a code object. The
+ code is executed by calling the :meth:`runcode` (which also handles run-time
+ exceptions, except for :exc:`SystemExit`). :meth:`runsource` returns ``False``.
+
+ The return value can be used to decide whether to use ``sys.ps1`` or ``sys.ps2``
+ to prompt the next line.
+
+
+.. method:: InteractiveInterpreter.runcode(code)
+
+ Execute a code object. When an exception occurs, :meth:`showtraceback` is called
+ to display a traceback. All exceptions are caught except :exc:`SystemExit`,
+ which is allowed to propagate.
+
+ A note about :exc:`KeyboardInterrupt`: this exception may occur elsewhere in
+ this code, and may not always be caught. The caller should be prepared to deal
+ with it.
+
+
+.. method:: InteractiveInterpreter.showsyntaxerror([filename])
+
+ Display the syntax error that just occurred. This does not display a stack
+ trace because there isn't one for syntax errors. If *filename* is given, it is
+ stuffed into the exception instead of the default filename provided by Python's
+ parser, because it always uses ``'<string>'`` when reading from a string. The
+ output is written by the :meth:`write` method.
+
+
+.. method:: InteractiveInterpreter.showtraceback()
+
+ Display the exception that just occurred. We remove the first stack item
+ because it is within the interpreter object implementation. The output is
+ written by the :meth:`write` method.
+
+
+.. method:: InteractiveInterpreter.write(data)
+
+ Write a string to the standard error stream (``sys.stderr``). Derived classes
+ should override this to provide the appropriate output handling as needed.
+
+
+.. _console-objects:
+
+Interactive Console Objects
+---------------------------
+
+The :class:`InteractiveConsole` class is a subclass of
+:class:`InteractiveInterpreter`, and so offers all the methods of the
+interpreter objects as well as the following additions.
+
+
+.. method:: InteractiveConsole.interact([banner])
+
+ Closely emulate the interactive Python console. The optional banner argument
+ specify the banner to print before the first interaction; by default it prints a
+ banner similar to the one printed by the standard Python interpreter, followed
+ by the class name of the console object in parentheses (so as not to confuse
+ this with the real interpreter -- since it's so close!).
+
+
+.. method:: InteractiveConsole.push(line)
+
+ Push a line of source text to the interpreter. The line should not have a
+ trailing newline; it may have internal newlines. The line is appended to a
+ buffer and the interpreter's :meth:`runsource` method is called with the
+ concatenated contents of the buffer as source. If this indicates that the
+ command was executed or invalid, the buffer is reset; otherwise, the command is
+ incomplete, and the buffer is left as it was after the line was appended. The
+ return value is ``True`` if more input is required, ``False`` if the line was
+ dealt with in some way (this is the same as :meth:`runsource`).
+
+
+.. method:: InteractiveConsole.resetbuffer()
+
+ Remove any unhandled source text from the input buffer.
+
+
+.. method:: InteractiveConsole.raw_input([prompt])
+
+ Write a prompt and read a line. The returned line does not include the trailing
+ newline. When the user enters the EOF key sequence, :exc:`EOFError` is raised.
+ The base implementation uses the built-in function :func:`raw_input`; a subclass
+ may replace this with a different implementation.
+