Enable reading textures from spec in Python

PiperOrigin-RevId: 842151742
Change-Id: I477d118cc7e2385d29b395b192fa89e9facb9c3e

doc/python.rst

@@ -654,6 +654,19 @@ The :ref:`mjsMesh` object includes convenience methods for model creation with n
    mesh = spec.add_mesh(name='prism')
    mesh.make_cone(nedge=5, radius=1)
 
+Texture editing
+^^^^^^^^^^^^^^^
+The :ref:`mjsTexture` buffer option stores the texture bytes in the ``data`` attribute. This attribute is stored as
+bytes but its elements can be read and modified as ``int``\s via index access and read as Python's built-in ``bytes`` or
+``bytearray`` objects.  See `specs_test.py
+<https://github.com/google-deepmind/mujoco/blob/main/python/mujoco/specs_test.py>`__.
+
+.. code-block:: python
+
+  texture = spec.add_texture(name='texture', height=1, width=3, nchannel=3)
+  texture.data = bytes([255, 0, 0, 0, 255, 0, 0, 0, 255])  # Assign red, green and blue pixels.
+  texture.data[1] = 255  # Change the first pixel to yellow.
+
 .. _PyMJCF:
 
 Relationship to ``PyMJCF`` and ``bind``