https://github.com/python/cpython/commit/996300c794683fbb9d6ccc8c697b2e56f52ea1a6
commit: 996300c794683fbb9d6ccc8c697b2e56f52ea1a6
branch: 3.15
author: Serhiy Storchaka <[email protected]>
committer: hugovk <[email protected]>
date: 2026-09-05T16:01:06+01:00
summary:
[3.15] gh-156347: Fix wrong statements in the curses documentation (GH-156354)
(#156872)
window.encoding does not encode the string arguments on a build with
wide-character support: the curses library converts the characters itself.
In the HOWTO: getch() returns -1, not curses.ERR, when there is no input,
and half-delay mode does the same as no-delay mode. getkey() returns the
key name only for a special key. leaveok() is not a synonym for curs_set().
getstr() returns a bytes object, interprets the erase and kill characters,
and limits bytes. The ACS_* constants are not all larger than 255.
Also document get_wch() before getch(), and read whole characters in the
example.
(cherry picked from commit 161054cbfe5a5fb566698c3514ad6bc2078b00d8)
files:
M Doc/howto/curses.rst
M Doc/library/curses.rst
diff --git a/Doc/howto/curses.rst b/Doc/howto/curses.rst
index 7bcf63c0b458962..8adbd64ed7ecce0 100644
--- a/Doc/howto/curses.rst
+++ b/Doc/howto/curses.rst
@@ -297,15 +297,18 @@ the next subsection.
The :meth:`~curses.window.addstr` method takes a Python string or
bytestring as the value to be displayed. The contents of bytestrings
-are sent to the terminal as-is. Strings are encoded to bytes using
-the value of the window's :attr:`~window.encoding` attribute; this defaults to
-the default system encoding as returned by :func:`locale.getencoding`.
+are sent to the terminal as-is.
+On a build without wide-character support strings are encoded
+using the value of the window's :attr:`~window.encoding` attribute;
+this defaults to the default system encoding
+as returned by :func:`locale.getencoding`.
The :meth:`~curses.window.addch` methods take a character, which can be
either a string of length 1, a bytestring of length 1, or an integer.
-Constants are provided for extension characters; these constants are
-integers greater than 255. For example, :const:`ACS_PLMINUS` is a +/-
+Constants are provided for the characters of the terminal's alternate
+character set.
+For example, :const:`ACS_PLMINUS` is a +/-
symbol, and :const:`ACS_ULCORNER` is the upper left corner of a box
(handy for drawing borders). You can also use the appropriate Unicode
character.
@@ -319,11 +322,11 @@ won't be distracting; it can be confusing to have the
cursor blinking at some
apparently random location.
If your application doesn't need a blinking cursor at all, you can
-call ``curs_set(False)`` to make it invisible. For compatibility
-with older curses versions, there's a ``leaveok(bool)`` function
-that's a synonym for :func:`~curses.curs_set`. When *bool* is true, the
-curses library will attempt to suppress the flashing cursor, and you
-won't need to worry about leaving it in odd locations.
+call ``curs_set(False)`` to make it invisible.
+The window method :meth:`~curses.window.leaveok` does something different:
+when its argument is true,
+curses leaves the cursor wherever the last update put it,
+instead of moving it back to the window's cursor position.
Attributes and Color
@@ -429,40 +432,48 @@ The C curses library offers only very simple input
mechanisms. Python's
:mod:`curses` module adds a basic text-input widget. (Other libraries
such as :pypi:`Urwid` have more extensive collections of widgets.)
-There are two methods for getting input from a window:
+There are three methods for getting input from a window:
-* :meth:`~curses.window.getch` refreshes the screen and then waits for
+* :meth:`~curses.window.get_wch` refreshes the screen and then waits for
the user to hit a key, displaying the key if :func:`~curses.echo` has been
called earlier. You can optionally specify a coordinate to which
the cursor should be moved before pausing.
-* :meth:`~curses.window.getkey` does the same thing but converts the
- integer to a string. Individual characters are returned as
- 1-character strings, and special keys such as function keys return
- longer strings containing a key name such as ``KEY_UP`` or ``^G``.
+* :meth:`~curses.window.getch` does the same thing but returns the code of
+ the key instead of a character.
+ With ncurses this is a single byte of the key's encoding in the current
+ locale, so a character encoded with several bytes takes several calls,
+ one byte per call.
+
+* :meth:`~curses.window.getkey` does the same as :meth:`!getch` but returns
+ a string:
+ an ordinary key as a 1-character string,
+ and a special key as its name, such as ``KEY_UP``.
It's possible to not wait for the user using the
:meth:`~curses.window.nodelay` window method. After ``nodelay(True)``,
-:meth:`!getch` and :meth:`!getkey` for the window become
-non-blocking. To signal that no input is ready, :meth:`!getch` returns
-``curses.ERR`` (a value of -1) and :meth:`!getkey` raises an exception.
+the reads for the window become non-blocking.
+To signal that no input is ready,
+:meth:`!get_wch` and :meth:`!getkey` raise an exception,
+and :meth:`!getch` returns ``-1``.
There's also a :func:`~curses.halfdelay` function, which can be used to (in
-effect) set a timer on each :meth:`!getch`; if no input becomes
+effect) set a timer on each read; if no input becomes
available within a specified delay (measured in tenths of a second),
-curses raises an exception.
+the read fails the same way.
-The :meth:`!getch` method returns an integer; if it's between 0 and 255, it
-represents the ASCII code of the key pressed. Values greater than 255 are
-special keys such as Page Up, Home, or the cursor keys. You can compare the
-value returned to constants such as :const:`curses.KEY_PPAGE`,
+Special keys such as Page Up, Home, or the cursor keys are returned by all
+three as one of the :ref:`KEY_* constants <curses-key-constants>`,
+all larger than 255.
+You can compare the value returned to constants such as
+:const:`curses.KEY_PPAGE`,
:const:`curses.KEY_HOME`, or :const:`curses.KEY_LEFT`. The main loop of
your program may look something like this::
while True:
- c = stdscr.getch()
- if c == ord('p'):
+ c = stdscr.get_wch()
+ if c == 'p':
PrintDocument()
- elif c == ord('q'):
+ elif c == 'q':
break # Exit the while loop
elif c == curses.KEY_HOME:
x = y = 0
@@ -474,15 +485,16 @@ conversion functions that take either integer or
1-character-string arguments
and return the same type. For example, :func:`curses.ascii.ctrl` returns the
control character corresponding to its argument.
-There's also a method to retrieve an entire string,
+There's also a method to retrieve an entire line,
:meth:`~curses.window.getstr`. It isn't used very often, because its
functionality is quite limited; the only editing keys available are
-the backspace key and the Enter key, which terminates the string. It
-can optionally be limited to a fixed number of characters. ::
+the erase and kill characters, and the Enter key, which terminates the line.
+It returns a bytes object,
+and can optionally be limited to a fixed number of bytes. ::
curses.echo() # Enable echoing of characters
- # Get a 15-character string, with the cursor on the top line
+ # Get a line of at most 15 bytes, with the cursor on the top line
s = stdscr.getstr(0,0, 15)
The :mod:`curses.textpad` module supplies a text box that supports an
diff --git a/Doc/library/curses.rst b/Doc/library/curses.rst
index f87107f395a8c4a..4cdc40300d6b32b 100644
--- a/Doc/library/curses.rst
+++ b/Doc/library/curses.rst
@@ -984,7 +984,8 @@ Window objects
.. attribute:: window.encoding
- Encoding used to encode method arguments (Unicode strings and characters).
+ Encoding used to encode the string arguments of the methods and to decode
+ their results on a build without wide-character support.
The encoding attribute is inherited from the parent window when a subwindow
is created, for example with :meth:`window.subwin`.
By default, current locale encoding is used (see
:func:`locale.getencoding`).
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