Looking at various examples of python-fu, it seems the width of an image can be obtained with method #1 or method #2 below (see below). Method #2 is a property of the image object. Where are the properties documented or how can I see all the properties of the image? Is one method preferred over the other?

I just prefer method 2.

I don't know where documentation is for image's attributes and methods are
but using the below code it prints out all the methods and attributes for image

it prints out this list
['ID', '__class__', '__cmp__', '__delattr__', '__doc__', '__format__', '__getattribute__', '__hash__', '__init__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', 'active_channel', 'active_drawable', 'active_layer', 'active_vectors', 'add_channel', 'add_hguide', 'add_layer', 'add_vguide', 'attach_new_parasite', 'base_type', 'channels', 'clean_all', 'crop', 'delete_guide', 'dirty', 'disable_undo', 'duplicate', 'enable_undo', 'filename', 'find_next_guide', 'flatten', 'floating_sel_attached_to', 'floating_selection', 'free_shadow', 'get_channel_by_tattoo', 'get_component_active', 'get_component_visible', 'get_guide_orientation', 'get_guide_position', 'get_layer_by_tattoo', 'height', 'insert_channel', 'insert_layer', 'layers', 'lower_channel', 'lower_layer', 'lower_layer_to_bottom', 'merge_down', 'merge_visible_layers', 'name', 'new_layer', 'parasite_attach', 'parasite_detach', 'parasite_find', 'parasite_list', 'pick_correlate_layer', 'raise_channel', 'raise_layer', 'raise_layer_to_top', 'remove_channel', 'remove_layer', 'resize', 'resize_to_layers', 'resolution', 'scale', 'selection', 'set_component_active', 'set_component_visible', 'tattoo_state', 'undo_freeze', 'undo_group_end', 'undo_group_start', 'undo_is_enabled', 'undo_thaw', 'unit', 'unset_active_channel', 'uri', 'vectors', 'width']

Some are methods, i guess you'll just to play around with them to get the right parameters going.
or a link to documentation would be nice usually, the methods need parameters just like their pdb.methods equivalent without the image parameter since this already belongs to image.

In the python console

does the same. In practice you'll also find other objects/classes with other not-too-documented attributes. Some are read-only, some can be written to (layer.name='New name'). Instinct, experimentation and comparison with the pdb.* method usually gives you enough to work them out.

Using the object methods/attributes makes for more readable (and oftesn simpler) code.

Very helpful!

With the dir(image) example, image is really something like:



The only way I know how to get access to the image is




I found additional help in the Python Console: