How to unhide hidden objects with a Python script?

Question

Here are a few objects that I have hidden:

I am using the script below to make them visible:

bpy.ops.object.hide_view_clear()

but it does not help.

So what is the perfect script to make them visible?

Answer 1

As of Blender 2.81, Object.hide_set() is working properly and seems to be the equivalent of Object.hide property in 2.7x versions.

Proof using the console:

>>> bpy.context.object.hide_set(False)

To unhide multiple objects you can run over objects in the scene and call the setter per object:

for o in ("Cube", "Camera", "Light"):
   obj = bpy.context.scene.objects.get(o)
   #if obj: obj.hide_viewport = False
   if obj: obj.hide_set(False)

You can also iterate through any given collection:

col = bpy.data.collections.get("Collection")
if col:
   for obj in col.objects:
       obj.hide_set(False)

Whatever you like...

Answer 2

You need a way to specify which objects to unhide. Hidden objects cannot be selected, so you cannot just use bpy.context.selected_objects, you can use their names to identify them or whatever other attribute. You will need to loop through the objects from which you wish to pick the ones to unhide, you could use bpy.data.objects to do that for all scenes, but bpy.context.scene.objects are all the objects in the current scene that you are more likely to wish to work with. The script picking them by name could be something like this:

import bpy

for o in bpy.context.scene.objects:
    if 'Cube' in o.name:
        o.hide_viewport = o.hide_render = False

Note that there are a few ways to hide objects. object.hide_viewport or object.hide_render or object.hide_select

You can find out stuff like that using autocomplete functionality of the Python console (ctrl+space while hovering mouse over Python console panel with some text you started typing):

C is short for bpy.context in the console. C.object is the active object.