Python 3.10.4 : EbookLib python library - part 001.

EbookLib is a Python library for managing EPUB2/EPUB3 files. It’s capable of reading and writing EPUB files programmatically.

You can read more about this python library on this website.

First, I install with the pip tool:

C:\Python310>python -m pip install --upgrade pip
Requirement already satisfied: pip in c:\python310\lib\site-packages (22.1)
Collecting pip
  WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, stat
us=None)) after connection broken by 'NewConnectionError(': Failed to establish a n
ew connection: [Errno 11001] getaddrinfo failed')': /packages/1f/2c/d9626f045e7b
49a6225c6b09257861f24da78f4e5f23af2ddbdf852c99b8/pip-22.2.2-py3-none-any.whl
  Downloading pip-22.2.2-py3-none-any.whl (2.0 MB)
     ---------------------------------------- 2.0/2.0 MB 1.5 MB/s eta 0:00:00
Installing collected packages: pip
  Attempting uninstall: pip
    Found existing installation: pip 22.1
    Uninstalling pip-22.1:
      Successfully uninstalled pip-22.1
Successfully installed pip-22.2.2

C:\Python310>python -m pip install lxml-4.9.0-cp310-cp310-win_amd64.whl
Processing c:\python310\lxml-4.9.0-cp310-cp310-win_amd64.whl
Installing collected packages: lxml
Successfully installed lxml-4.9.0

C:\Python310>python -m pip install EbookLib --user
Collecting EbookLib
  Using cached EbookLib-0.17.1.tar.gz (111 kB)
  Preparing metadata (setup.py) ... done
Requirement already satisfied: lxml in c:\python310\lib\site-packages (from Eboo
kLib) (4.9.0)
Collecting six
  Using cached six-1.16.0-py2.py3-none-any.whl (11 kB)
Using legacy 'setup.py install' for EbookLib, since package 'wheel' is not insta
lled.
Installing collected packages: six, EbookLib
  Running setup.py install for EbookLib ... done
Successfully installed EbookLib-0.17.1 six-1.16.0

I used a the simple python script from the last tutorial to test it:

The last tutorial used the default script from the official webpage.

Compared to the default script, I made changes, the selection in the Romanian language and diacritics...

from ebooklib import epub

book = epub.EpubBook()

# set metadata
book.set_identifier('__1976')
book.set_title('')
book.set_language('en')

book.add_author('Autho: Cătălin George Feștilă')

# create chapter
cap001 = epub.EpubHtml(title='Intro', file_name='capitolul_01.xhtml', lang='ro')
cap001.content=u'<h1>Introducere</h1><p>Această carte este...</p>'

# add chapter
book.add_item(cap001)

# define Table Of Contents
book.toc = (epub.Link('capitolul_01.xhtml', 'Introducere', 'introducere'),
             (epub.Section('O carte simplă'),
             (cap001, ))
            )

# add default NCX and Nav file
book.add_item(epub.EpubNcx())
book.add_item(epub.EpubNav())

# define CSS style
style = 'BODY {color: white;}'
nav_css = epub.EpubItem(uid="style_nav", file_name="style/nav.css", media_type="text/css", content=style)

# add CSS file
book.add_item(nav_css)

# basic spine
book.spine = ['nav', cap001]

# write to the file
epub.write_epub('ro_lan_test.epub', book, {})

This is the result of the epub file:

Python 3.11.0a7 : image conversions in Python.

Image processing is very important in development, therefore also in python.

The image processing packages used in python have undergone changes over time.

Pillow and PIL cannot co-exist in the same environment. Before installing Pillow, please uninstall PIL.

Pillow higher than version 10 no longer supports import Image. Please use from PIL import Image instead.

Pillow higher than version 2.1.0 no longer supports import _imaging. Please use from PIL.Image import core as _imaging instead.

Although the image formats are old compared to the newer ones in vector format, they are preferred depending on the field of work.

You can see all of these file image formats on the official python package.

First, the basic installation start with upgrade the pip tool:

C:\PythonProjects\ConvertImages>python -m pip install --upgrade pip
Requirement already satisfied: pip in c:\python311alpha\lib\site-packages (22.1.
2)
Collecting pip
  Downloading pip-22.2-py3-none-any.whl (2.0 MB)
     ---------------------------------------- 2.0/2.0 MB 3.3 MB/s eta 0:00:00
Installing collected packages: pip
  Attempting uninstall: pip
    Found existing installation: pip 22.1.2
    Uninstalling pip-22.1.2:
      Successfully uninstalled pip-22.1.2
Successfully installed pip-22.2

Secondary, the install of the Pillow python package:

C:\PythonProjects\ConvertImages>python  -m pip install --upgrade Pillow
Collecting Pillow
  Downloading Pillow-9.2.0-cp311-cp311-win_amd64.whl (3.3 MB)
     ---------------------------------------- 3.3/3.3 MB 4.0 MB/s eta 0:00:00
Installing collected packages: Pillow
Successfully installed Pillow-9.2.0

I have a webp image here that I have scaled to smaller sizes and that I will test its conversion from webp format to png format.

The image is named waterski2 and I'm using the 3.11.0a7 python version.

Let's see the source code:

from PIL import Image

# open the image file WEBP
image = Image.open('waterski2.webp')

# show the image 
image.show()

# convert the image to RGB color
image = image.convert('RGB')

# save PNG RGB image
image.save('waterski2_RGB_PNG.png', 'png')

# save JPG RGB image
image.save('waterski2_RGB_JPG.jpg', 'jpeg')

# open the image file JPG
image_jpg = Image.open('waterski2_RGB_JPG.jpg')

# convert the image to RGB color
image_rgb_jpg = image_jpg.convert('RGB')

# save PNG RGB image from JPG
image_rgb_jpg.save('new-image_RGB_PNG_from_JPG.png', 'png')

#same process of conversion to WEBP file type
# from png image
image = Image.open('waterski2_RGB_PNG.png')
image = image.convert('RGB')
image.save('new-image_RGB_WEBP_from_png.webp', 'webp')
# from jpg image
image = Image.open('waterski2_RGB_JPG.jpg')
image = image.convert('RGB')
image.save('new-image_RGB_WEBP_from_jpg.webp', 'webp')

Here is a screenshot with these converted images and the processed image.

Blender 3D and python scripting - part 023.

This script will add a submenu to the main Help menu with an icon with a folder that will open the explorer from the Windows operating system.

I have not solved the tooltip of this button, it is set to show a message about opening a URL.

This is the source code:

import bpy

def menu_func(self, context):
    '''Open explorer in windows systems'''
    self.layout.operator(
            "wm.url_open", text="Open explorer", icon='FILE_FOLDER').url = "C:/"
def register():
    bpy.types.TOPBAR_MT_help.append(menu_func)

def unregister():
    bpy.types.TOPBAR_MT_help.remove(menu_func)

if __name__ == "__main__":
    register()

If you want to change the tooltip then need to create a class OpenOperator and wrapper for this operator function and set the bl_label and all you need to have it.

The menu_func will get the layout operator with all defined in the class OpenOperator and will set the tooltip with the text: Open explorer in windows systems.

See this new source code:

import bpy

def menu_func(self, context):
    self.layout.operator(
            OpenOperator.bl_idname, text="Open explorer", icon='FILE_FOLDER')

class OpenOperator(bpy.types.Operator):
    """Open explorer in windows systems"""
    bl_idname = "wm.open_explorer"
    bl_label = "Open explorer"

    def execute(self, context):
        bpy.ops.wm.url_open(url="C:/")
        return {'FINISHED'}


def register():
    bpy.utils.register_class(OpenOperator)
    bpy.types.TOPBAR_MT_help.append(menu_func)


def unregister():
    bpy.utils.unregister_class(OpenOperator)
    bpy.types.TOPBAR_MT_help.remove(menu_func)


if __name__ == "__main__":
    register()

Python 3.7.13 : My colab tutorials - part 026.

Vosk is an offline open source speech recognition toolkit. It enables speech recognition for 20+ languages and dialects - English, Indian English, German, French, Spanish, Portuguese, Chinese, Russian, Turkish, Vietnamese, Italian, Dutch, Catalan, Arabic, Greek, Farsi, Filipino, Ukrainian, Kazakh, Swedish, Japanese, Esperanto, Hindi, Czech, Polish. More to come.

Today I tested this Python package with a video that contains sound content in the Chinese language

I created a simple interface where you can test other videos on youtube and where you can select the language and start time and duration for the detection sequence with the python vosk package.

I used the python youtube_dl package to take portions of wav sound from a youtube video.

I haven't done tests on other videos but it should work.

You can find it on this colab notebook.

Python 3.11.0a7 : local script for update python packages.

If you want to upgrade all local packages from a local script for pip with version greater than 10.0.1 version use a local python script with this source code:

import pkg_resources
from subprocess import call

packages = [dist.project_name for dist in pkg_resources.working_set]
call("pip install --upgrade " + ' '.join(packages), shell=True)

Run it with the python executable and you will see something like this:

C:\Python311alpha>python.exe update_python.py
...
Requirement already satisfied: pip-api in c:\python311alpha\lib\site-packages (0.0.29)
Requirement already satisfied: pypng in c:\python311alpha\lib\site-packages (0.0.21)
Requirement already satisfied: PyGetWindow in c:\python311alpha\lib\site-packages (0.0.9)
Requirement already satisfied: bs4 in c:\python311alpha\lib\site-packages (0.0.1)

Python 3.7.13 : My colab tutorials - part 025.

Today I tested a simple data processing example with the first image from NASA's James Webb Space Telescope

You can find this example and more on my GitHub repository for colab.

This is one of results of data processing with a simple logaritm function to see magnitude spectrum of Fourier transform X by shifting the zero-frequency map:

Blender 3D and python scripting - part 022.

In the last tutorial, we exemplified with the default template from Blender 3D how to create a panel in the Object area.

Today I will show you how to modify this panel with some useful elements for developing an addon.

The purpose of the old tutorial on this is the differences and changes that must be made to the template source code to introduce the following functions:

    StringProperty(
    BoolProperty( 
    IntProperty(
    IntVectorProperty(
    FloatProperty(
    FloatVectorProperty(
    BoolVectorProperty(

Some arguments need to be modified to have different input data, see the selection of colors in the attached image:

I commented on the source code areas in the template and added my changes:

The class also called SceneSettingItem and CollectionProperty is currently being tested and is not finalized to be implemented, it can be seen in panel: 0 items.

It can be seen that any defined class must be registered and unregistered

Here is the source code used to get the new screenshot changes:

import bpy

# Assign a collection
class SceneSettingItem(bpy.types.PropertyGroup):
    name = bpy.props.StringProperty(name="Cube")
    mesh = bpy.props.PointerProperty(type=bpy.types.Mesh)
    


PROPS = [
            ('myString', bpy.props.StringProperty(name='myString', default='this is my string!')),
            ('myBoolean', bpy.props.BoolProperty(name='myBoolean', default=False)),
            ('myInt', bpy.props.IntProperty(name='myInt', default=1)),
            ('myIntVectorXYZ', bpy.props.IntVectorProperty(subtype='XYZ')),
            ('myFloat', bpy.props.FloatProperty(name='myFloat', default=1)),
            ('myFloatVectorXYZ', bpy.props.FloatVectorProperty(subtype='XYZ')),
            ('myBooleanVector', bpy.props.BoolVectorProperty(size=3)),
            ('myBooleanVectorXYZ', bpy.props.BoolVectorProperty(size=3,subtype='XYZ')),
            ('myBooleanVectorColor', bpy.props.FloatVectorProperty(name="Edit Mode Color", subtype='COLOR',  default=(0.76, 0.0, 0.0), size=3, min=0, max=1)),
            ('myCollectionProperty', bpy.props.CollectionProperty(type=SceneSettingItem)),
        ]    

class HelloWorldPanelVariables(bpy.types.Panel):
    """Creates a Panel in the Object properties window"""
    bl_label = "Hello World Panel Variables"
    bl_idname = "OBJECT_PT_hello"
    bl_space_type = 'PROPERTIES'
    bl_region_type = 'WINDOW'
    bl_context = "object"

#    def draw(self, context):
#        layout = self.layout
#        obj = context.object
#        row = layout.row()
#        row.label(text="Hello world!", icon='WORLD_DATA')
#        row = layout.row()
#        row.label(text="Active object is: " + obj.name)
#        row = layout.row()
#        row.prop(obj, "name")
#        row = layout.row()
#        row.operator("mesh.primitive_cube_add")

    def draw(self, context):
        col = self.layout.column()
        for (prop_name, _) in PROPS:
            row = col.row()
            row.prop(context.scene, prop_name)

        
def register():
    bpy.utils.register_class(SceneSettingItem)
    bpy.utils.register_class(HelloWorldPanelVariables)
    for (prop_name, prop_value) in PROPS:
        setattr(bpy.types.Scene, prop_name, prop_value)

def unregister():
    bpy.utils.unregister_class(SceneSettingItem)
    bpy.utils.unregister_class(HelloWorldPanelVariables)    
    for (prop_name, _) in PROPS:
        delattr(bpy.types.Scene, prop_name)

if __name__ == "__main__":
    register()

Blender 3D and python scripting - part 021.

I will continue the series of tutorials with python and the Blender 3D software interface.

From the main menu we can get to the scripting part and here we choose Templates - Python - Ui Panel Simple.

The source code will be added to the python editor.

Save this source code with a name and load it as an addon.

After loading this source code it can be found at Properties at Object, see screenshot.

You can see the source code from the Ui Panel Simple template that I used.

import bpy

class HelloWorldPanel(bpy.types.Panel):
    """Creates a Panel in the Object properties window"""
    bl_label = "Hello World Panel"
    bl_idname = "OBJECT_PT_hello"
    bl_space_type = 'PROPERTIES'
    bl_region_type = 'WINDOW'
    bl_context = "object"

    def draw(self, context):
        layout = self.layout

        obj = context.object

        row = layout.row()
        row.label(text="Hello world!", icon='WORLD_DATA')

        row = layout.row()
        row.label(text="Active object is: " + obj.name)
        row = layout.row()
        row.prop(obj, "name")

        row = layout.row()
        row.operator("mesh.primitive_cube_add")

def register():
    bpy.utils.register_class(HelloWorldPanel)


def unregister():
    bpy.utils.unregister_class(HelloWorldPanel)

if __name__ == "__main__":
    register()

Python 3.7.10 : Simple example with PyQRCode.

The pyqrcode module is a QR code generator that can automate most of the building process for creating QR codes.

The pypng python library is required to save and upload PNG images.

I had to install them both with the pip utility.

pip install pyqrcode
Collecting pyqrcode
  Using cached PyQRCode-1.2.1-py3-none-any.whl
Installing collected packages: pyqrcode
Successfully installed pyqrcode-1.2.1
WARNING: There was an error checking the latest version of pip.
...
pip install pypng
Collecting pypng
  Using cached pypng-0.0.21-py3-none-any.whl (48 kB)
Installing collected packages: pypng
Successfully installed pypng-0.0.21
WARNING: There was an error checking the latest version of pip.
Let's try some simple examples:
import pyqrcode
url = pyqrcode.create('https://ro.wikipedia.org/wiki/Utilizator:Catalin_Festila', error='H', mode='binary')
url.svg('uca-url.svg', scale=8)
url.eps('uca-url.eps', scale=2)
url.png('code.png', scale=5, module_color=[0, 0, 0, 128], background=[0, 0, 128])
url.show()
print(url.terminal(quiet_zone=1))
This is the result of this source code:

Python 3.7.13 : About pip-audit version 2.3.4.

More infos about this python package can be found here.

pip-audit is a tool for scanning Python environments for packages with known vulnerabilities. It uses the Python Packaging Advisory Database (https://github.com/pypa/advisory-database) via the PyPI JSON API as a source of vulnerability reports.

I tested this package feature for colab google with these python packages: unionml, pandas, sklearn and pip-audit.

You can see all vulnerabilities or you can use argument --desc for more information:

!pip-audit
- Auditing zipp (3.8.0)
Found 54 known vulnerabilities in 14 packages
Name          Version  ID                  Fix Versions
------------- -------- ------------------- ----------------------------
dask          2.12.0   PYSEC-2021-387      2021.10.0
distributed   1.25.3   GHSA-j8fq-86c5-5v2r 2021.10.0
httplib2      0.17.4   PYSEC-2020-46       0.18.0
httplib2      0.17.4   PYSEC-2021-16       0.19.0
ipython       5.5.0    PYSEC-2022-12       6.0.0rc1,7.16.3,7.31.1,8.0.1
lxml          4.2.6    PYSEC-2021-19       4.6.3
lxml          4.2.6    PYSEC-2020-62       4.6.2
lxml          4.2.6    PYSEC-2021-852      4.6.5
mpmath        1.2.1    PYSEC-2021-427
notebook      5.3.1    PYSEC-2018-18       5.7.2
notebook      5.3.1    PYSEC-2019-158      5.7.8
notebook      5.3.1    PYSEC-2018-57       5.4.1
notebook      5.3.1    PYSEC-2018-17       5.7.1
notebook      5.3.1    PYSEC-2019-159      5.7.6
notebook      5.3.1    PYSEC-2019-157      5.5.0
notebook      5.3.1    PYSEC-2020-215      6.1.5
notebook      5.3.1    PYSEC-2022-180      6.4.10
notebook      5.3.1    PYSEC-2022-212      6.4.12
notebook      5.3.1    GHSA-hwvq-6gjx-j797 5.7.11,6.4.1
notebook      5.3.1    GHSA-rv62-4pmj-xw6h 5.7.8
numpy         1.21.6   GHSA-fpfv-jqm9-f5jm 1.22
opencv-python 4.1.2.30 GHSA-8849-5h85-98qw
opencv-python 4.1.2.30 GHSA-m6vm-8g8v-xfjh
opencv-python 4.1.2.30 GHSA-q799-q27x-vp7w 4.2.0.32
pillow        7.1.2    PYSEC-2021-137      8.2.0
pillow        7.1.2    PYSEC-2021-138      8.2.0
pillow        7.1.2    PYSEC-2021-70       8.1.0
pillow        7.1.2    PYSEC-2021-331      8.3.0
pillow        7.1.2    PYSEC-2021-41       8.1.1
pillow        7.1.2    PYSEC-2021-71       8.1.0
pillow        7.1.2    PYSEC-2021-69       8.1.0
pillow        7.1.2    PYSEC-2021-38       8.1.1
pillow        7.1.2    PYSEC-2021-139      8.2.0
pillow        7.1.2    PYSEC-2021-94       8.2.0
pillow        7.1.2    PYSEC-2021-39       8.1.1
pillow        7.1.2    PYSEC-2021-36       8.1.1
pillow        7.1.2    PYSEC-2021-40       8.1.1
pillow        7.1.2    PYSEC-2021-37       8.1.1
pillow        7.1.2    PYSEC-2021-317      8.3.2
pillow        7.1.2    PYSEC-2021-35       8.1.1
pillow        7.1.2    PYSEC-2021-93       8.2.0
pillow        7.1.2    PYSEC-2021-42       8.1.1
pillow        7.1.2    PYSEC-2021-92       8.2.0
pillow        7.1.2    PYSEC-2022-10       9.0.0
pillow        7.1.2    PYSEC-2022-9        9.0.0
pillow        7.1.2    PYSEC-2022-8        9.0.0
pillow        7.1.2    PYSEC-2022-168      9.0.1
pillow        7.1.2    GHSA-jgpv-4h4c-xhw3 8.1.2
pillow        7.1.2    GHSA-4fx9-vc88-q2xc 9.0.0
psutil        5.4.8    PYSEC-2019-41       5.6.6
pygments      2.6.1    PYSEC-2021-140      2.7.4
pygments      2.6.1    PYSEC-2021-141      2.7.4
urllib3       1.25.11  PYSEC-2021-108      1.26.5
werkzeug      1.0.1    PYSEC-2022-203      2.1.1
Name                    Skip Reason
----------------------- ------------------------------------------------------------------------------------------------
dlib                    Dependency not found on PyPI and could not be audited: dlib (19.18.0+zzzcolab20220513001918)
en-core-web-sm          Dependency not found on PyPI and could not be audited: en-core-web-sm (3.3.0)
jaxlib                  Dependency not found on PyPI and could not be audited: jaxlib (0.3.7+cuda11.cudnn805)
pygobject               Dependency not found on PyPI and could not be audited: pygobject (3.26.1)
screen-resolution-extra Dependency not found on PyPI and could not be audited: screen-resolution-extra (0.0.0)
tensorflow              Dependency not found on PyPI and could not be audited: tensorflow (2.8.2+zzzcolab20220527125636)
torch                   Dependency not found on PyPI and could not be audited: torch (1.11.0+cu113)
torchaudio              Dependency not found on PyPI and could not be audited: torchaudio (0.11.0+cu113)
torchvision             Dependency not found on PyPI and could not be audited: torchvision (0.12.0+cu113)
xkit                    Dependency not found on PyPI and could not be audited: xkit (0.0.0)

Blender 3D and python scripting - part 020.

So far I have added or branched used python scripts in the blender and created a UV texture for this use UV Smart projection.

The resulting script is quite large in content.

I thought I should create an addon to use and show you how to do it.

Let's follow the basic steps when working with python scripts in Blender 3D.

1. go to the tag named: Scripting;
2. use main menu to create a new script from Text - New;
3. use main menu - Template - Python - Addon Add Object;
4. save the script with a good name, I used: addon_catafest_add_branch.py;
5. save the blend file with a good name: I used: addon_catafest_add_branch.blend;

See this screenshot:

After these changes you can modify in the template file the parts related to the names, descriptions and other elements that will be viewed in Blender 3D

Restart the Blender 3D software, open the python script with all changes and run it.

In the 3D Viewport area press the shortkeys: Shift + A and use Mesh menu to see this addon feature, see screenshot:

This is source code I used:

bl_info = {
    "name": "New branch",
    "author": "Your Name Here",
    "version": (1, 0),
    "blender": (3, 3, 0),
    "location": "View3D > Add > Mesh > New Object",
    "description": "Adds a new branch Mesh Object",
    "warning": "",
    "doc_url": "",
    "category": "Add Mesh",
}


import bpy
from bpy.types import Operator
from bpy.props import FloatVectorProperty
from bpy_extras.object_utils import AddObjectHelper, object_data_add
from mathutils import Vector


def add_object(self, context):
    scale_x = self.scale.x
    scale_y = self.scale.y

    verts = [
        Vector((-1 * scale_x, 1 * scale_y, 0)),
        Vector((1 * scale_x, 1 * scale_y, 0)),
        Vector((1 * scale_x, -1 * scale_y, 0)),
        Vector((-1 * scale_x, -1 * scale_y, 0)),
    ]

    edges = []
    faces = [[0, 1, 2, 3]]

    mesh = bpy.data.meshes.new(name="New Object Mesh")
    mesh.from_pydata(verts, edges, faces)
    # useful for development when the mesh may be invalid.
    # mesh.validate(verbose=True)
    object_data_add(context, mesh, operator=self)


class OBJECT_OT_add_object(Operator, AddObjectHelper):
    """Create a new branch Mesh Object"""
    bl_idname = "mesh.add_object"
    bl_label = "Add Mesh Object"
    bl_options = {'REGISTER', 'UNDO'}

    scale: FloatVectorProperty(
        name="scale",
        default=(1.0, 1.0, 1.0),
        subtype='TRANSLATION',
        description="scaling",
    )

    def execute(self, context):

        add_object(self, context)

        return {'FINISHED'}


# Registration

def add_object_button(self, context):
    self.layout.operator(
        OBJECT_OT_add_object.bl_idname,
        text="catafest - add branch",
        icon='PLUGIN')


# This allows you to right click on a button and link to documentation
def add_object_manual_map():
    url_manual_prefix = "https://docs.blender.org/manual/en/latest/"
    url_manual_mapping = (
        ("bpy.ops.mesh.add_object", "scene_layout/object/types.html"),
    )
    return url_manual_prefix, url_manual_mapping


def register():
    bpy.utils.register_class(OBJECT_OT_add_object)
    bpy.utils.register_manual_map(add_object_manual_map)
    bpy.types.VIEW3D_MT_mesh_add.append(add_object_button)


def unregister():
    bpy.utils.unregister_class(OBJECT_OT_add_object)
    bpy.utils.unregister_manual_map(add_object_manual_map)
    bpy.types.VIEW3D_MT_mesh_add.remove(add_object_button)


if __name__ == "__main__":
    register()

Blender 3D and python scripting - part 019.

Today I'm going to show you how to have a UV map for the entire mesh of the object created with the smart projection mode.

It's the same when you create a UV map using UV Mapping - Smart UV Project in the UV Editing view.

In principle, everything created in the Blender 3D interface has an equivalent in the A.P.I. of the 3D Blender.

You can see a screenshot with this script:

Here you see the source code that includes this option.

import bpy
import random

# import bmesh 
import bmesh

MinNubmer = -10
MaxNumber = 10

# Clean up the area , uncoment the next two row to keep
# branch after running the script
#bpy.ops.object.select_all(action="SELECT")
#bpy.ops.object.delete()

# Number of branches
branch = 4
# Create the verts array
verts = [(0,0,0)]
# Create the edges array
edges = [(0,0)]
# Create the faces array
faces = []

# define random number for X and Y axis 
def RN():
    return  random.randint(MinNubmer, MaxNumber) / 20 

# define random number for positive Z axis
def RNZ():
    return  random.randint(10, 50) / 10  

# create a list of branch thicknesses
rand_list = []

name_branch = "TreeMesh"
# define createBranch 

def createBranch(branch, name_branch):
    # Create the mesh for branch 
    mesh = bpy.data.meshes.new(name_branch) 
    for i in range(1,branch):
        rand_list.append(RNZ()/30)
        # sort all reverse by thicknesses
        rand_list.sort(reverse=True)

    # generate vertices list for drawing the branch
    for i in range(1,branch):
        verts.append((rand_list[i-1] +0.1,rand_list[i-1]+0.1,RNZ()))
        edges.append((i-1,i))
    
    # sort the list of vertices by last number witch is Z axis 
    verts.sort(key=lambda x: x[2])
    # create branch update and validate, see documentation
    mesh.from_pydata(verts, edges, faces) 
    mesh.update()
    mesh.validate()
    # Create object to hold the mesh branch with the new name for object
    obj = bpy.data.objects.new(name_branch+'_Obj', mesh)
    return obj

# create a new branch     
def createNewBranch(obj_branch, n):
    bpy.ops.object.mode_set(mode="EDIT", toggle=False)
    me = obj_branch.data
    bm = bmesh.from_edit_mesh(me)
    bm.select_mode = {'VERT'}

    for i,v in enumerate(bm.verts):
        # select only by the index of list 
        if i == n:
            v.select = ( v.co.x > 0.0 )
            v2 = v    
        else: 
            v.select = False
    # flush and update view 
    v1 = bm.verts.new( (RN()+(v.co.x) + 1.0 , RN()+(v.co.y) + 1.0 , (v.co.z) - (v.co.z)/3) )
    #v1 = bm.verts.new(1, 1, 3)
    bm.edges.new((v1, v2))
    rand_list.append(0.01)
    rand_list.sort(reverse=True)
    # update 
    bm.select_flush_mode()   
    me.update()
    #mesh.validate()
    #bmesh.update_edit_mesh(obj_branch.data)
    

# use the createBranch
obj_branch = createBranch(branch, name_branch)


## now set up shape key in Blender
#mesh=obj_branch.data
#sk_basis = obj_branch.shape_key_add(name='Basis',from_mix=False)
#sk_basis.interpolation = 'KEY_LINEAR'
## must set relative to false here
#obj_branch.data.shape_keys.use_relative = False

## create new shape key
#sk = obj_branch.shape_key_add(name='Deform',from_mix=False)
#sk.interpolation = 'KEY_LINEAR'
#sk.slider_min = 0
#sk.slider_max = 2

# ... and add it to the scene
scene = bpy.context.scene
scene.collection.objects.link(obj_branch)

# this will fix the error ...  mode_set_poll()
bpy.context.view_layer.objects.active = obj_branch  

createNewBranch(obj_branch, 1)

# print tool for developing area 
def print_python_console(data):
    for window in bpy.context.window_manager.windows:
        screen = window.screen
        for area in screen.areas:
            if area.type == 'CONSOLE':
                override = {'window': window, 'screen': screen, 'area': area}
                bpy.ops.console.scrollback_append(override, text=str(data), type="OUTPUT")

# used to see the size of radius skin for each vertices
print_python_console(rand_list)

# fix error :  skin modifier is locked when using edit mode.
bpy.ops.object.mode_set(mode="OBJECT", toggle=False)
# add the skin modifier - NOT FIXED FOR THE LAST BRANC ADDED
obj_branch.modifiers.new(name="SK", type="SKIN")
bpy.context.view_layer.objects.active = obj_branch  
# get the skin vertices layers
skin_vertices = obj_branch.data.skin_vertices
# get the layer
skin_layer = skin_vertices[0]
for i in range(1,branch+1):
    # assigns radius for each vertice to sized the branch 
    skin_layer.data[i-1].radius = (rand_list[i-1], rand_list[i-1]) 
    #Indices 0 and 1 are the vertex indices
    skin_layer.data[i].radius = (rand_list[i-1],rand_list[i-1])

# this will apply the modifier named 'SK'
bpy.ops.object.modifier_apply( modifier = 'SK' )
#
bpy.ops.object.mode_set(mode="EDIT", toggle=True)
bpy.ops.object.skin_root_mark()

bpy.ops.object.mode_set(mode="OBJECT", toggle=True)
# set modes for user 

mesh = bpy.data.meshes.new(name_branch+'_Obj') 
mesh.update()
mesh.validate()

import math 

def get_dimension(normal):
    x_abs = math.fabs(normal[0])
    y_abs = math.fabs(normal[1])
    z_abs = math.fabs(normal[2])
    if z_abs >= x_abs and z_abs >= y_abs:
        return 2
    elif x_abs >= y_abs:
        return 0
    else:
        return 1

texture_scale = 1.0
bpy.ops.object.mode_set(mode="EDIT", toggle=True)  
bpy.ops.mesh.select_all(action='SELECT')  
me = obj_branch.data
bm = bmesh.from_edit_mesh(me)

bpy.ops.uv.sphere_project()

uv_layer = bm.loops.layers.uv.verify()

# adjust uv coordinates
for face in bm.faces:
    for l in face.loops:
        luv = l[uv_layer]
        # select UV vertex if these are in certain range
        if 0 <= luv.uv.x <= 1 and 0 <= luv.uv.y <= 1:
            luv.select = True
            luv = l[uv_layer]
            luv.uv = l.vert.co.yz * texture_scale
            luv.uv = l.vert.co.xz * texture_scale
            luv.uv = l.vert.co.xy * texture_scale
                
bmesh.update_edit_mesh(me) 
me.update()  

bpy.ops.object.mode_set(mode='EDIT')
bpy.ops.mesh.select_all(action='SELECT')
bpy.ops.uv.smart_project(angle_limit=1.15192, island_margin=0, area_weight=0, correct_aspect=True, scale_to_bounds=False)
# use this for cylinder project for UV map 
#bpy.ops.uv.cylinder_project(direction='ALIGN_TO_OBJECT',
#align='POLAR_ZX',
#radius=1.0,
#correct_aspect=True,
#clip_to_bounds=False,
#scale_to_bounds=True)


bmesh.update_edit_mesh(me)
bpy.ops.object.mode_set(mode="OBJECT", toggle=True)

Blender 3D and python scripting - part 018.

In this tutorial I will show you how to create a UV map.

I searched the web and the documentation briefly and I didn't find anything very concrete, but here I created a functional example.

The example contains a function that calculates dimensions, which are then processed and added to the UV Editing workspace.

This is what the source code added to the initial script tested looks like:

mesh.validate()

import math 

def get_dimension(normal):
    x_abs = math.fabs(normal[0])
    y_abs = math.fabs(normal[1])
    z_abs = math.fabs(normal[2])
    if z_abs >= x_abs and z_abs >= y_abs:
        return 2
    elif x_abs >= y_abs:
        return 0
    else:
        return 1

texture_scale = 1.0
bpy.ops.object.mode_set(mode="EDIT", toggle=True)    
me = obj_branch.data
bm = bmesh.from_edit_mesh(me)

uv_layer = bm.loops.layers.uv.verify()


for f in bm.faces:
    largest_index = get_dimension(f.normal)
    for l in f.loops:
        luv = l[uv_layer]
        luv.uv = l.vert.co.yz * texture_scale
        luv.uv = l.vert.co.xz * texture_scale
        luv.uv = l.vert.co.xy * texture_scale


me.update()

Here is a screenshot of the result, you can see that it only shows the node, you can select for all nodes to see a final result.