from skimage import data

import napari

with napari.gui_qt():

viewer = napari.Viewer()

# each image is stacked on a layer list (it should be a layer stack =D)

# we assign a label to each layer so that we can recover it easily later

viewer.add_image(data.astronaut(), name='astronaut')

viewer.add_image(data.moon(), name='moon')

viewer.add_image(data.camera(), name='camera')

# we can access the layers

#

# viewer.layers[key]

#

# key can be the key/label assigned to the layer or

# an index (integer value)

#

# `viewer.layers` has type LayerList, which is a list-like layer collection

# with built-in reordering and callback hooks.

# A layer with an image has the type: napari.layers.image.image.Image

# or 'Image layer'

# To remove a layer, just use:

# viewer.layers.pop(i)

# All these codes can be used in the built-in interactive terminal

# of Napari, which already has all loaded data on memory