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python-3.7.4-docs-html/_sources/tutorial/interactive.rst.txt

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+.. _tut-interacting:
+
+**************************************************
+Interactive Input Editing and History Substitution
+**************************************************
+
+Some versions of the Python interpreter support editing of the current input
+line and history substitution, similar to facilities found in the Korn shell and
+the GNU Bash shell.  This is implemented using the `GNU Readline`_ library,
+which supports various styles of editing.  This library has its own
+documentation which we won't duplicate here.
+
+
+.. _tut-keybindings:
+
+Tab Completion and History Editing
+==================================
+
+Completion of variable and module names is
+:ref:`automatically enabled <rlcompleter-config>` at interpreter startup so
+that the :kbd:`Tab` key invokes the completion function; it looks at
+Python statement names, the current local variables, and the available
+module names.  For dotted expressions such as ``string.a``, it will evaluate
+the expression up to the final ``'.'`` and then suggest completions from
+the attributes of the resulting object.  Note that this may execute
+application-defined code if an object with a :meth:`__getattr__` method
+is part of the expression.  The default configuration also saves your
+history into a file named :file:`.python_history` in your user directory.
+The history will be available again during the next interactive interpreter
+session.
+
+
+.. _tut-commentary:
+
+Alternatives to the Interactive Interpreter
+===========================================
+
+This facility is an enormous step forward compared to earlier versions of the
+interpreter; however, some wishes are left: It would be nice if the proper
+indentation were suggested on continuation lines (the parser knows if an indent
+token is required next).  The completion mechanism might use the interpreter's
+symbol table.  A command to check (or even suggest) matching parentheses,
+quotes, etc., would also be useful.
+
+One alternative enhanced interactive interpreter that has been around for quite
+some time is IPython_, which features tab completion, object exploration and
+advanced history management.  It can also be thoroughly customized and embedded
+into other applications.  Another similar enhanced interactive environment is
+bpython_.
+
+
+.. _GNU Readline: https://tiswww.case.edu/php/chet/readline/rltop.html
+.. _IPython: https://ipython.org/
+.. _bpython: https://www.bpython-interpreter.org/