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Maniphest T63504

Python Template demo script error
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Description

System Information
Operating system: Ubuntu 18.04.2 64bit
Graphics card: AMD RX 580 8GB

Blender Version
Broken: 2.80.55, a3b88c917299, 2019-04-10
Broken also in 2.79b

Short description of error
This error appears when running a demo template python script included in Blender

raise KeyError("key {name!r} already exists")

Exact steps for others to reproduce the error

  1. Open Blender
  2. Go in Scripting workspace
  3. Select ui_previews_dynamic_enum.py from Templates > Python > UI Previews Dynamic Enum
  4. Run it, you will find the panel in the object properties window
  5. Now choose a directory for the icons to load
  6. Choose another directory
  7. And choose the directory you have chosen before (point 5)

The following error appears:

Traceback (most recent call last):
  File "/ui_previews_dynamic_enum.py", line 54, in enum_previews_from_directory_items
  File "/home/marco/Scaricati/blender-2.80-a3b88c917299-linux-glibc224-x86_64/2.80/scripts/modules/bpy/utils/previews.py", line 97, in load
    raise KeyError("key {name!r} already exists")
KeyError: 'key {name!r} already exists'
File "/ui_previews_dynamic_enum.py", line 26, in enum_previews_from_directory_items

Revisions and Commits

rB Blender
rBf3fc8271b81f Fix T63504: Python Template 'ui_previews_dynamic_enum' error

Related Objects

Event Timeline

Marco (nacioss) created this task.Apr 11 2019, 10:27 PM
Marco (nacioss) updated the task description. (Show Details)Apr 11 2019, 10:42 PM
Marco (nacioss) added a project: BF Blender: 2.8.
Jeroen Bakker (jbakker) added a subscriber: Jeroen Bakker (jbakker).Apr 12 2019, 8:51 AM
Marco (nacioss) added a comment.Apr 12 2019, 1:17 PM

And i found a solution to the problem:
just add these lines of code after line 53 of the script

icon = pcoll.get(name)
if not icon:
    thumb = pcoll.load(name, filepath, 'IMAGE')
else:
    thumb = pcoll[name]


So that it checks if the icons have already been imported.
This could be helpful to others who need to make a dynamic enum.

Philipp Oeser (lichtwerk) claimed this task.Apr 12 2019, 2:07 PM
Philipp Oeser (lichtwerk) lowered the priority of this task from 90 to 50.
Philipp Oeser (lichtwerk) added a subscriber: Philipp Oeser (lichtwerk).

lgtm, will commit, thx for the fix!

Philipp Oeser (lichtwerk) edited projects, added Add-ons (BF-Blender); removed BF Blender: 2.8.Apr 12 2019, 2:07 PM
Philipp Oeser (lichtwerk) changed the task status from Unknown Status to Resolved by committing rBf3fc8271b81f: Fix T63504: Python Template 'ui_previews_dynamic_enum' error.Apr 12 2019, 2:12 PM
Philipp Oeser (lichtwerk) added a commit: rBf3fc8271b81f: Fix T63504: Python Template 'ui_previews_dynamic_enum' error.
Marco (nacioss) added a comment.Apr 12 2019, 2:15 PM

Wow :D my first python fix! Thank you a lot, you are awesome!

Alfonso Annarumma (anfeo) added a subscriber: Alfonso Annarumma (anfeo).Jan 23 2020, 2:38 PM

You can do a

pcoll.clear()

After the if that control the chance of directory.
If you change directory do a clear of pcoll.