How to install PySide2 in Blender Python
GOAL
To use PySide/PySide2 UI in Blender Addon.
In this article PySide2 UI is used independently. PySide is not embedded in Blender custom UI or include Blender custom UI inside.
(more…)Month: September 2020
[Error]pip._vendor.urllib3.exceptions.ReadTimeoutError: HTTPSConnectionPool
Error Detail
When I install PySide2 with pip command, the error below occurred. There are 2 exceptions “socket.timeout: The read operation timed out” and “pip._vendor.urllib3.exceptions.ReadTimeoutError“.
<!–more–>
>pip install pyside2
Collecting pyside2
Downloading PySide2-5.15.2-5.15.2-cp35.cp36.cp37.cp38.cp39-none-win_amd64.whl (136.3 MB)
|██████████████████ | 75.3 MB 25 kB/s eta 0:40:29ERROR: Exception:
Traceback (most recent call last):
File "c:\users\<user_name>\appdata\local\programs\python\python38\lib\site-packages\pip\_vendor\urllib3\response.py", line 437, in _error_catcher
yield
.
.
. Omitted
.
.
File "c:\users\<user_name>\appdata\local\programs\python\python38\lib\ssl.py", line 1099, in read
return self._sslobj.read(len, buffer)
socket.timeout: The read operation timed out
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "c:\users\<user_name>\appdata\local\programs\python\python38\lib\site-packages\pip\_internal\cli\base_command.py", line 228, in _main
status = self.run(options, args)
.
.
. Omitted
.
.
File "c:\users\<user_name>\appdata\local\programs\python\python38\lib\site-packages\pip\_vendor\urllib3\response.py", line 442, in _error_catcher
raise ReadTimeoutError(self._pool, None, "Read timed out.")
pip._vendor.urllib3.exceptions.ReadTimeoutError: HTTPSConnectionPool(host='files.pythonhosted.org', port=443): Read timed out.Environment
Windows 10
Pyhon 3.8.7
pip 20.2.3
Cause
When response couldn’t gotten in time, both of exceptions are occurred. The time is defined by environment variable “PIP_DEFAULT_TIMEOUT”.
The cause is just a poor connection in my case.
Solution
Change the value of PIP_DEFAULT_TIMEOUT (the value is an integer in seconds).
Reference : “Environment Variables” from pip documentation
Method 1. Pass the option to pip directly
pip --default-timeout=1200 install pyside2
Method 2. Set the default value
set PIP_DEFAULT_TIMEOUT=1200
[Blender Error] AttributeError: ‘_RestrictContext’ object has no attribute ‘view_layer’
Error Detail
When I activate my addon that uses operations with bpy.ops in register() function, the error “AttributeError: ‘_RestrictContext’ object has no attribute ‘view_layer’ ” occurred.
(more…)How to see revision and restore previous article in WordPress
I mistakenly overwrote my article in WordPress. How can I recover them?
GOAL
To see revisions of the article and recover previous version in WordPress.
Environment
WordPress 5.6
Windows 10
Methods
Open the post and click “Revisions” in right sidebar.
Select the revision you’d like to recover and click “Restore This Revision” button.
What to do if “Restore This Revision” button is disable
“Restore This Revision” button couldn’t be pressed for some reasons.
You can copy the elements of previous version and paste it into the editor.
How To Run Python Script When Blender Starts
GOAL
To run Python script when Blender starts only once or every time.
Environment
Blender 2.83
Windows 10
Method
I created a simple Python script “Documents\blenderPython\test\spheres.py” to add spheres as below
import bpy
for i in range(3):
bpy.ops.mesh.primitive_uv_sphere_add(radius=1, location=((i-1)*3, 0, 3))Only once
Start Blender with command
Start blender in command prompt with an argument -P or –python.
Reference: Python Options in Blender 2.91 Manual