Update Doc/tutorial/interpreter.rst

Co-authored-by: Petr Viktorin <encukou@gmail.com>

Author: Yuheng3107

Doc/tutorial/interpreter.rst

@@ -32,6 +32,15 @@ Typing an end-of-file character (:kbd:`Control-D` on Unix, :kbd:`Control-Z` on
 Windows) at the primary prompt causes the interpreter to exit with a zero exit
 status.  If that doesn't work, you can exit the interpreter by typing the
 following command: ``quit()``.
+The interpreter's line-editing features include interactive editing, history
+substitution and code completion on most systems.
+Perhaps the quickest check to see whether command line editing is supported is
+typing a word in on the Python prompt, then pressing Left arrow (or :kbd:`Control-b`).
+If the cursor moves, you have command line editing; see Appendix
+:ref:`tut-interacting` for an introduction to the keys.
+If nothing appears to happen, or if a sequence like ``^[[D`` or ``^B`` appears,
+command line editing isn't available; you'll only be able to use
+backspace to remove characters from the current line.
 
 The interpreter operates somewhat like the Unix shell: when called with standard
 input connected to a tty device, it reads and executes commands interactively;