gh-88773: Added teleport method to Turtle library

Doc/library/turtle.rst

@@ -107,6 +107,7 @@ Turtle motion
       | :func:`right` | :func:`rt`
       | :func:`left` | :func:`lt`
       | :func:`goto` | :func:`setpos` | :func:`setposition`
+      | :func:`teleport`
       | :func:`setx`
       | :func:`sety`
       | :func:`setheading` | :func:`seth`
@@ -372,6 +373,44 @@ Turtle motion
        (0.00,0.00)
 
 
+.. function:: teleport(x, y=None, *, fill_gap=False)
+
+   :param x: a number or ``None``
+   :param y: a number or ``None``
+   :param fill_gap: a boolean
+
+   Move turtle to an absolute position. Unlike goto(x, y), a line will not
+   be drawn. The turtle's orientation does not change. If currently
+   filling, the polygon(s) teleported from will be filled after leaving,
+   and filling will begin again after teleporting. This can be disabled
+   with fill_gap=True, which makes the imaginary line traveled during
+   teleporting act as a fill barrier like in goto(x, y).
+
+   .. doctest::
+      :skipif: _tkinter is None
+      :hide:
+
+      >>> turtle.goto(0, 0)
+
+   .. doctest::
+      :skipif: _tkinter is None
+
+       >>> tp = turtle.pos()
+       >>> tp
+       (0.00,0.00)
+       >>> turtle.teleport(60)
+       >>> turtle.pos()
+       (60.00,0.00)
+       >>> turtle.teleport(y=10)
+       >>> turtle.pos()
+       (60.00,10.00)
+       >>> turtle.teleport(20, 30)
+       >>> turtle.pos()
+       (20.00,30.00)
+
+   .. versionadded: 3.12
+
+
 .. function:: setx(x)
 
    :param x: a number (integer or float)
@@ -537,8 +576,7 @@ Turtle motion
       :skipif: _tkinter is None
 
       >>> turtle.color("blue")
-      >>> turtle.stamp()
-      11
+      >>> stamp_id = turtle.stamp()
       >>> turtle.fd(50)
 
 
@@ -575,15 +613,8 @@ Turtle motion
    .. doctest::
 
       >>> for i in range(8):
-      ...     turtle.stamp(); turtle.fd(30)
-      13
-      14
-      15
-      16
-      17
-      18
-      19
-      20
+      ...     unused_stamp_id = turtle.stamp()
+      ...     turtle.fd(30)
       >>> turtle.clearstamps(2)
       >>> turtle.clearstamps(-2)
       >>> turtle.clearstamps()

Lib/test/test_turtle.py

@@ -267,6 +267,14 @@ def test_goto(self):
         self.assertAlmostEqual(self.nav.xcor(), 100)
         self.assertAlmostEqual(self.nav.ycor(), -100)
 
+    def test_teleport(self):
+        self.nav.teleport(20, -30, fill_gap=True)
+        self.assertAlmostEqual(self.nav.xcor(), 20)
+        self.assertAlmostEqual(self.nav.ycor(), -30)
+        self.nav.teleport(-20, 30, fill_gap=False)
+        self.assertAlmostEqual(self.nav.xcor(), -20)
+        self.assertAlmostEqual(self.nav.ycor(), 30)
+
     def test_pos(self):
         self.assertEqual(self.nav.pos(), self.nav._position)
         self.nav.goto(100, -100)
@@ -440,6 +448,18 @@ def test_showturtle_hideturtle_and_isvisible(self):
         tpen.showturtle()
         self.assertTrue(tpen.isvisible())
 
+    def test_teleport(self):
+
+        tpen = turtle.TPen()
+
+        for fill_gap_value in [True, False]:
+            tpen.penup()
+            tpen.teleport(100, 100, fill_gap=fill_gap_value)
+            self.assertFalse(tpen.isdown())
+            tpen.pendown()
+            tpen.teleport(-100, -100, fill_gap=fill_gap_value)
+            self.assertTrue(tpen.isdown())
+
 
 if __name__ == '__main__':
     unittest.main()

Lib/turtle.py

@@ -135,7 +135,7 @@
         'pu', 'radians', 'right', 'reset', 'resizemode', 'rt',
         'seth', 'setheading', 'setpos', 'setposition', 'settiltangle',
         'setundobuffer', 'setx', 'sety', 'shape', 'shapesize', 'shapetransform', 'shearfactor', 'showturtle',
-        'speed', 'st', 'stamp', 'tilt', 'tiltangle', 'towards',
+        'speed', 'st', 'stamp', 'teleport', 'tilt', 'tiltangle', 'towards',
         'turtlesize', 'undo', 'undobufferentries', 'up', 'width',
         'write', 'xcor', 'ycor']
 _tg_utilities = ['write_docstringdict', 'done']
@@ -1614,6 +1614,13 @@ def _goto(self, end):
         """move turtle to position end."""
         self._position = end
 
+    def teleport(self, x=None, y=None, *, fill_gap: bool = False) -> None:
+        """To be overwritten by child class RawTurtle.
+        Includes no TPen references."""
+        new_x = x if x is not None else self._position[0]
+        new_y = y if y is not None else self._position[1]
+        self._position = Vec2D(new_x, new_y)
+
     def forward(self, distance):
         """Move the turtle forward by the specified distance.
 
@@ -2293,6 +2300,15 @@ def fillcolor(self, *args):
         else:
             return self._color(self._fillcolor)
 
+    def teleport(self, x=None, y=None, *, fill_gap: bool = False) -> None:
+        """To be overwritten by child class RawTurtle.
+        Includes no TNavigator references.
+        """
+        pendown = self.isdown()
+        if pendown:
+            self.pen(pendown=False)
+        self.pen(pendown=pendown)
+
     def showturtle(self):
         """Makes the turtle visible.
 
@@ -2710,6 +2726,54 @@ def _cc(self, args):
         if not ((0 <= r <= 255) and (0 <= g <= 255) and (0 <= b <= 255)):
             raise TurtleGraphicsError("bad color sequence: %s" % str(args))
         return "#%02x%02x%02x" % (r, g, b)
+
+    def teleport(self, x=None, y=None, *, fill_gap: bool = False) -> None:
+        """Instantly move turtle to an absolute position.
+
+        Arguments:
+        x -- a number      or     None
+        y -- a number             None
+        fill_gap -- a boolean     This argument must be specified by name.
+
+        call: teleport(x, y)         # two coordinates
+        --or: teleport(x)            # teleport to x position, keeping y as is
+        --or: teleport(y=y)          # teleport to y position, keeping x as is
+        --or: teleport(x, y, fill_gap=True)          
+                                     # teleport but fill the gap in between
+
+        Move turtle to an absolute position. Unlike goto(x, y), a line will not
+        be drawn. The turtle's orientation does not change. If currently
+        filling, the polygon(s) teleported from will be filled after leaving,
+        and filling will begin again after teleporting. This can be disabled
+        with fill_gap=True, which makes the imaginary line traveled during 
+        teleporting act as a fill barrier like in goto(x, y).
+
+        Example (for a Turtle instance named turtle):
+        >>> tp = turtle.pos()
+        >>> tp
+        (0.00,0.00)
+        >>> turtle.teleport(60)
+        >>> turtle.pos()
+        (60.00,0.00)
+        >>> turtle.teleport(y=10)
+        >>> turtle.pos()
+        (60.00,10.00)
+        >>> turtle.teleport(20, 30)
+        >>> turtle.pos()
+        (20.00,30.00)
+        """
+        pendown = self.isdown()
+        was_filling = self.filling()
+        if pendown:
+            self.pen(pendown=False)
+        if was_filling and not fill_gap:
+            self.end_fill()
+        new_x = x if x is not None else self._position[0]
+        new_y = y if y is not None else self._position[1]
+        self._position = Vec2D(new_x, new_y)
+        self.pen(pendown=pendown)
+        if was_filling and not fill_gap:
+            self.begin_fill()   
 
     def clone(self):
         """Create and return a clone of the turtle.

Misc/NEWS.d/next/Library/2023-04-28-18-04-23.gh-issue-88773.xXCNJw.rst

@@ -0,0 +1 @@
+Added :func:`turtle.teleport` to the :mod:`turtle` module to move a turtle to a new point without tracing a line, visible or invisible.  Patch by Liam Gersten.