Sets the Python code evaluated when the item is executed.
When calling an operator, use one that supports the current editor, mode, and selection.

```python
# Add a cube in the 3D Viewport's Object Mode
bpy.ops.mesh.primitive_cube_add()
```

:::{admonition} Writing commands
:class: important

The input limit is **1,024 UTF-8 bytes**. Text containing multibyte characters reaches the limit sooner than 1,024 characters.
Separate short simple statements with `;`; do not mechanically flatten indented blocks into one line.
See [Code Input and Execution](/reference/command_text.md) for checking length and moving code into an external script.

:::

:::{admonition} Global variables
:class: hint

**Examples of available globals:**
- `C`: the context PME provides to scripts
- `O`: bpy.ops (Blender operators)
- `E`: event information

See [Scripting Reference](/reference/scripting.rst) for details.
:::