Python : Fix error user on install with requirements.txt.

The error show like this :

ERROR: Could not install packages due to an OSError: [WinError 5] Access is denied: 'C:\\Python311\\share'
Consider using the `--user` option or check the permissions.

This can be easy fix with :

pip install -r requirements.txt --user

By using the --user flag, the packages will be installed in the user-specific site-packages directory, ensuring that the packages are installed only for the current user and not affecting the system-wide Python installation.

News : OSINT - Open Source Intelligence python course.

For those who want to learn Python in order to: 

• become a really good developer; 
• to take the exam to get into university; 
• to be interviewed for a job.

This course omits VERY many important things and sometimes even recommends what could have been called bad practice. There are things that don't matter when writing small automations for everyday OSINT tasks, but are extremely important when creating serious team projects.

You cam see the project on this GhitHub account.

Python Qt6 : Download for youtube with PyQt6.

Simple example with PyQt6 to create an interface to download a video using a URL from youtube.

This simple example has some limitations, the filtering of the results is done according to the possibilities of the pytube mode and only after video, it does not use multithread and it does not have multiple selection possibilities and options. In conclusion, it offers a simple download functionality.

You can see more on my GitHub account.

import sys
from PyQt6.QtWidgets import QApplication, QMainWindow, QWidget, QVBoxLayout, QHBoxLayout, QLineEdit, QPushButton, QProgressBar, QDialog, QComboBox, QLabel, QMessageBox
from PyQt6.QtGui import QIcon, QPixmap
from pytube import YouTube
from PyQt6.QtCore import Qt
from PyQt6.QtWidgets import QDialogButtonBox


class FormatChecker:
    def __init__(self, url):
        self.url = url

    def check_formats(self):
        try:
            yt = YouTube(self.url)
            formats = []
            streams = yt.streams.filter(only_video=True)
            for stream in streams:
                if stream.url:
                    format_info = {
                        'resolution': stream.resolution,
                        'file_extension': stream.mime_type.split("/")[-1]
                    }
                    formats.append(format_info)
                    print(" format_info ",format_info)
            return formats
        except Exception as e:
            print("Error:", str(e))
            return []


class FormatInfo:
    def __init__(self, resolution, file_formats):
        self.resolution = resolution
        self.file_formats = file_formats


class ResolutionDialog(QDialog):
    def __init__(self, formats, parent=None):
        super().__init__(parent)
        self.setWindowTitle("Select Resolution and File Format")
        self.formats = formats

        layout = QVBoxLayout(self)

        self.resolution_combo = QComboBox(self)
        for format_info in formats:
            resolution = format_info.resolution
            self.resolution_combo.addItem(resolution)
        layout.addWidget(self.resolution_combo)

        self.file_format_combo = QComboBox(self)
        self.update_file_formats(self.resolution_combo.currentText())
        layout.addWidget(self.file_format_combo)

        button_box = QDialogButtonBox(QDialogButtonBox.StandardButton.Ok | QDialogButtonBox.StandardButton.Cancel)
        button_box.accepted.connect(self.accept)
        button_box.rejected.connect(self.reject)
        layout.addWidget(button_box)

        self.resolution_combo.currentIndexChanged.connect(self.on_resolution_changed)

    def update_file_formats(self, resolution):
        self.file_format_combo.clear()
        for format_info in self.formats:
            if format_info.resolution == resolution:
                file_formats = format_info.file_formats
                self.file_format_combo.addItems(file_formats)

    def selected_resolution(self):
        return self.resolution_combo.currentText()

    def selected_file_format(self):
        return self.file_format_combo.currentText()

    def on_resolution_changed(self, index):
        resolution = self.resolution_combo.currentText()
        self.update_file_formats(resolution)


class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("YouTube Downloader - selected - only_video =True")
        self.setFixedWidth(640)

        central_widget = QWidget(self)
        self.setCentralWidget(central_widget)

        layout = QVBoxLayout(central_widget)

        self.url_edit = QLineEdit()
        layout.addWidget(self.url_edit)

        download_button = QPushButton("Download")
        download_button.clicked.connect(self.show_resolution_dialog)
        layout.addWidget(download_button)

        progress_layout = QHBoxLayout()
        layout.addLayout(progress_layout)

        self.progress_bar = QProgressBar()
        self.progress_bar.setTextVisible(True)
        progress_layout.addWidget(self.progress_bar)

        self.progress_icon_label = QLabel(self)
        pixmap = QPixmap("youtube.png")  # Înlocuiți "path_to_icon.png" cu calea către iconul dorit
        self.progress_icon_label.setPixmap(pixmap)
        progress_layout.addWidget(self.progress_icon_label)

    def show_resolution_dialog(self):
        url = self.url_edit.text()
        if url:
            format_checker = FormatChecker(url)
            formats = format_checker.check_formats()
            format_infos = []
            for format in formats:
                resolution = format['resolution']
                file_extension = format['file_extension']
                format_info = next((info for info in format_infos if info.resolution == resolution), None)
                if format_info:
                    format_info.file_formats.append(file_extension)
                else:
                    format_info = FormatInfo(resolution, [file_extension])
                    format_infos.append(format_info)

            dialog = ResolutionDialog(format_infos, self)
            if dialog.exec() == QDialog.DialogCode.Accepted:
                resolution = dialog.selected_resolution()
                file_format = dialog.selected_file_format()
                self.download_video(url, resolution, file_format)
        else:
            print("Please enter a valid YouTube URL.")

    def download_video(self, url, resolution, file_format):
        try:
            yt = YouTube(url)
            stream = yt.streams.filter(only_video=True, resolution=resolution, mime_type="video/" + file_format).first()
            if stream:
                stream.download()
                print("Download completed!")
                QMessageBox.question(self, "Download Completed", "The video has been downloaded successfully.", QMessageBox.StandardButton.Ok)
            else:
                print("Error: The selected video format is not available for download.")
                QMessageBox.question(self, "Download Error", "The selected video format is not available for download.", QMessageBox.StandardButton.Ok)
        except Exception as e:
            print("Error:", str(e))
            QMessageBox.question(self, "Download Error", "An error occurred during the download.", QMessageBox.StandardButton.Ok)


def main():
    app = QApplication(sys.argv)
    window = MainWindow()
    window.show()
    sys.exit(app.exec())


if __name__ == "__main__":
    main()

Python 3.11.0 : Exo - domain-specific programming language in python.

Exo is a domain-specific programming language that helps low-level performance engineers transform very simple programs that specify what they want to compute into very complex programs that do the same thing as the specification, only much, much faster.

You can find it on GitHub project and on the official webpage.

Let's install it with pip tool:

C:\PythonProjects>mkdir exo-lang_001

C:\PythonProjects>cd exo-lang_001

C:\PythonProjects\exo-lang_001>pip install exo-lang --user
Collecting exo-lang
  Downloading exo_lang-0.0.2-py3-none-any.whl (142 kB)
  ...
Successfully installed PySMT-0.9.5 asdl-0.1.5 asdl-adt-0.1.0 astor-0.8.1 exo-lang-0.0.2 tomli-2.0.1 
yapf-0.33.0 z3-solver-4.12.2.0

Let's test with this default example but using virtual environments

This allow me to install Python packages in an isolated location from the rest of your system instead of installing them system-wide.

C:\PythonProjects\exo-lang_001>pip install virtualenv --user
...
C:\PythonProjects\exo-lang_001>python -m venv venv
C:\PythonProjects\exo-lang_001>venv\Scripts\activate.bat

(venv) C:\PythonProjects\exo-lang_001>python -m pip install -U setuptools wheel
Successfully installed setuptools-67.8.0 wheel-0.40.0

[notice] A new release of pip available: 22.3 -> 23.1.2
[notice] To update, run: python.exe -m pip install --upgrade pip
(venv) C:\PythonProjects\exo-lang_001>python.exe -m pip install --upgrade pip
Requirement already satisfied: pip in c:\pythonprojects\exo-lang_001\venv\lib\site-packages (22.3)
Collecting pip
  Using cached pip-23.1.2-py3-none-any.whl (2.1 MB)
...
Successfully installed pip-23.1.2
(venv) C:\PythonProjects\exo-lang_001>python -m pip install exo-lang
...
Installing collected packages: z3-solver, PySMT, asdl, tomli, numpy, attrs, astor, yapf, asdl-adt, exo-lang
Successfully installed PySMT-0.9.5 asdl-0.1.5 asdl-adt-0.1.0 astor-0.8.1 attrs-23.1.0 exo-lang-0.0.2 numpy-1.24.3
tomli-2.0.1 yapf-0.33.0 z3-solver-4.12.2.0

Let's try a simple example from official webpage:

(venv) C:\PythonProjects\exo-lang_001>notepad example.py
# example.py
from __future__ import annotations
from exo import *

@proc
def example_sgemm(
    M: size,
    N: size,
    K: size,
    C: f32[M, N] @ DRAM,
    A: f32[M, K] @ DRAM,
    B: f32[K, N] @ DRAM,
):
    for i in seq(0, M):
        for j in seq(0, N):
            for k in seq(0, K):
                C[i, j] += A[i, k] * B[k, j]

Use this command and check the out folder:

(venv) C:\PythonProjects\exo-lang_001>cd out
(venv) C:\PythonProjects\exo-lang_001\out>dir 
...
 example.c   example.h

If you want to know more see this video from youtube:

Python 3.11.3 : Using Jupyter Lab on Fedora linux distro.

JupyterLab is the latest web-based interactive development environment for notebooks, code, and data. Its flexible interface allows users to configure and arrange workflows in data science, scientific computing, computational journalism, and machine learning.

Follow these steps:

1. Install the jupyterlab python package using pip. This will allow you to run Jupyter notebooks in the terminal.

   pip install jupyterlab

2. Open a Jupyter Lab session in the terminal using the command:

   jupyter lab

3. Create a new notebook file and save it with the .ipynb extension.
4. In the notebook file, add the source code to work with the Python programming language and save the file notebook.

See the next screenshot how this works:

Python 3.8.10 : My colab tutorials and news from colab - part 033.

Colab comes with new changes:

Starting today paid users can select their preferred NVIDIA GPU. Visit Runtime > Change runtime type and choose between T4, V100, and A100. We'll do our best to assign your choice based on GPU availability.

Today I tested a new python package called News API with colab to search for news.

News API is a simple, easy-to-use REST API that returns JSON search results for current and historic news articles published by over 80,000 worldwide sources.

You can find my sample code in my collaboration area of the GitHub repository.

Extension for inkscape with python.

Today, I created the first Python extension for Inkscape, and although in theory, it seems easy, it is not really so.

You have to study a little and search the web, but I created a tutorial on one of my website.

The idea is to use at least two files with different extensions.

I named one catafest_extension.inx and the other catafest_extension.py.

For the Python file, I used this source code:

#!/usr/bin/env python
# coding=utf-8
#
# Copyright (C) 2023 Catalin George Festila, catafest@yahoo.com
#

"""
Simple test extension for inkscape
"""

import inkex
# add by me 

from lxml import etree
def draw_SVG_square(w,h, x,y, parent):
    style = { 'stroke'        : 'none',
              'stroke-width'  : '1',
              'fill'          : '#0000FF'
            }

    attribs = {
        'style'     : str(inkex.Style(style)),
        'height'    : str(h),
        'width'     : str(w),
        'x'         : str(x),
        'y'         : str(y)
            }
    patrat = etree.SubElement(
        parent, inkex.addNS('rect','svg'), attribs )
    return patrat

class MyExtension(inkex.Effect):
    def __init__(self):
        super().__init__()

    def effect(self):
        self.msg("This is an empty extension created by catafest !")
        parent = self.svg.get_current_layer()
        draw_SVG_square(100,100, 0,0, parent)

if __name__ == '__main__':
    MyExtension().run()

The result is this

Python 3.8.10 : My colab tutorials - part 032.

I haven't written for the python community in a long time, here is another example that I created using a tool from google called colab.

catafest_038.ipynb - simple example with StableDiffusionPipeline and DiffusionPipeline to generate images based a text ...

This and the other examples can be found in my repository named colab_google on my GitHub account.

Python Qt6 : use sqlite - part 002.

In this article tutorial I will show you how to read from the sqlite file the content of the table: files.

In the last article tutorial, I create a interface with PyQt6 that search files by regular expresion and result is add to sqlite file named: file_paths.db.

I used same steps with a default python class and I used QSqlTableModel to show the content received.

The script will create a window with this QSqlTableModel, then reads the file and add the result.

Let's see the source code:

import sys
from PyQt6.QtWidgets import QApplication, QMainWindow, QTableView
from PyQt6.QtSql import QSqlDatabase, QSqlQuery, QSqlTableModel

class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()

        # Initialize the database
        self.init_db()

        # Set up the GUI
        self.table_view = QTableView(self)
        self.setCentralWidget(self.table_view)

        # Set up the model and connect it to the database
        self.model = QSqlTableModel(self)
        self.model.setTable('files')
        self.model.select()
        self.table_view.setModel(self.model)

    def init_db(self):
        # Connect to the database
        db = QSqlDatabase.addDatabase('QSQLITE')
        db.setDatabaseName('file_paths.db')
        if not db.open():
            print('Could not open database')
            sys.exit(1)

    def create_table(self):
        # Create the 'files' table if it doesn't exist
        query = QSqlQuery()
        query.exec('CREATE TABLE IF NOT EXISTS files (id INTEGER PRIMARY KEY, path TEXT)')

if __name__ == '__main__':
    app = QApplication(sys.argv)
    window = MainWindow()
    window.show()
    sys.exit(app.exec())

I add this source code into a python script named view.py and I run it.

This is the result of the running script:

Python Qt6 : use sqlite - part 001.

This will default update for any python project:

python.exe -m pip install --upgrade pip --user
...
Successfully installed pip-23.1

The sqlite3 is already on my python instalation because I use version 3.11.0, you can see the official webpage.

Install the PyQt6 with the pip tool, I have this python package:

pip install PyQt6 --user
Requirement already satisfied: PyQt6 in c:\python311\lib\site-packages (6.4.1)
...

The next source of code will create a windows with two buttons and one edit area.

The PyQt6 graphics user interface use these elements: QPushButton, QLineEdit and QMessageBox from QWidget.

The python class will create a window with these elements and dor each of these is need to have methods.

First you need to select the folder, then use an regular expresion for search.

I used this : .*\.blend1$ this means *.blend1.

The last step is to use FindFiles button to search all blend files, in this case and add path of each of these to the sqlite database into a table named: files .

If you select the root C: then will take some time to search the files.

Let's see the source code:

import sys
import os
import re
from PyQt6.QtWidgets import *
from PyQt6.QtCore import *
import sqlite3

class FindFiles(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("Find Files")
        self.setGeometry(100, 100, 500, 300)

        self.folder_button = QPushButton("Choose Folder")
        self.folder_button.clicked.connect(self.choose_folder)
        self.pattern_edit = QLineEdit()
        self.pattern_edit.setPlaceholderText("Enter regular expression pattern")
        self.pattern_edit.setFixedWidth(250)
        self.find_button = QPushButton("Find Files")
        self.find_button.clicked.connect(self.find_files)

        layout = QVBoxLayout()
        layout.addWidget(self.folder_button)
        layout.addWidget(self.pattern_edit)
        layout.addWidget(self.find_button)
        self.setLayout(layout)

        self.folder_path = ""

        self.conn = sqlite3.connect("file_paths.db")
        self.cursor = self.conn.cursor()
        self.cursor.execute("CREATE TABLE IF NOT EXISTS files (id INTEGER PRIMARY KEY, path TEXT)")

    def choose_folder(self):
        self.folder_path = QFileDialog.getExistingDirectory(self, "Choose Folder")
        if self.folder_path:
            self.folder_button.setText(self.folder_path)

    def find_files(self):
        if not self.folder_path:
            QMessageBox.warning(self, "Warning", "Please choose a folder first!")
            return

        pattern = self.pattern_edit.text()

        if not pattern:
            QMessageBox.warning(self, "Warning", "Please enter a regular expression pattern!")
            return

        file_paths = []
        for root, dirs, files in os.walk(self.folder_path):
            for file in files:
                if re.match(pattern, file):
                    file_path = os.path.join(root, file)
                    file_paths.append(file_path)
                    self.cursor.execute("INSERT INTO files (path) VALUES (?)", (file_path,))
        self.conn.commit()

        QMessageBox.information(self, "Information", f"Found {len(file_paths)} files that match the pattern!")

if __name__ == "__main__":
    app = QApplication(sys.argv)
    find_files = FindFiles()
    find_files.show()
    sys.exit(app.exec())

I put this source code into a file named:main.py and I run it.

python main.py

The result is this:

Python 3.11.0 : about consolemenu .

This simple console menu can help to create menus, you can find the project on GitHub project.

pip install console-menu --user

For testing, I used the default example, and works well.

# Import the necessary packages
from consolemenu import *
from consolemenu.items import *

# Create the menu
menu = ConsoleMenu("Title", "Subtitle")

# Create some items

# MenuItem is the base class for all items, it doesn't do anything when selected
menu_item = MenuItem("Menu Item")

# A FunctionItem runs a Python function when selected
function_item = FunctionItem("Call a Python function", input, ["Enter an input"])

# A CommandItem runs a console command
command_item = CommandItem("Run a console command",  "touch hello.txt")

# A SelectionMenu constructs a menu from a list of strings
selection_menu = SelectionMenu(["item1", "item2", "item3"])

# A SubmenuItem lets you add a menu (the selection_menu above, for example)
# as a submenu of another menu
submenu_item = SubmenuItem("Submenu item", selection_menu, menu)

# Once we're done creating them, we just add the items to the menu
menu.append_item(menu_item)
menu.append_item(function_item)
menu.append_item(command_item)
menu.append_item(submenu_item)

# Finally, we call show to show the menu and allow the user to interact
menu.show()

Create an ovoid with python on Blender 3D.

Blender 3D use python version 3.10.9 and you can write your scripts with the Blender 3D features. This script can also be found on the website where I write tutorials. This Python script for Blender 3D creates an ovoid model using the math formula for ovoid:

import bpy
import math

# Define the parameters of the ovoid
a = 1.9
b = 1.5
c = 1.5

# Define the number of vertices in each direction
n_long = 32
n_lat = 16

# Create a new mesh
mesh = bpy.data.meshes.new(name="Ovoid")

# Create the vertices
verts = []
for j in range(n_lat):
    lat = (j / (n_lat - 1)) * math.pi
    for i in range(n_long):
        lon = (i / (n_long - 1)) * 2 * math.pi
        x = a * math.sin(lat) * math.cos(lon)
        y = b * math.sin(lat) * math.sin(lon)
        z = c * math.cos(lat)
        verts.append((x, y, z))

# Create the faces
faces = []
for j in range(n_lat - 1):
    for i in range(n_long - 1):
        v1 = j * n_long + i
        v2 = j * n_long + i + 1
        v3 = (j + 1) * n_long + i + 1
        v4 = (j + 1) * n_long + i
        faces.append((v1, v2, v3, v4))

# Create the mesh and object
mesh.from_pydata(verts, [], faces)
obj = bpy.data.objects.new(name="Ovoid", object_data=mesh)

# Add the object to the scene
scene = bpy.context.scene
scene.collection.objects.link(obj)

Python : Open3D cannot be used on Windows 10 and Fedora Linux Distro .

Open3D is an open-source library that supports rapid development of software that deals with 3D data. The Open3D frontend exposes a set of carefully selected data structures and algorithms in both C++ and Python. The backend is highly optimized and is set up for parallelization. Open3D was developed from a clean slate with a small and carefully considered set of dependencies. It can be set up on different platforms and compiled from source with minimal effort. The code is clean, consistently styled, and maintained via a clear code review mechanism. Open3D has been used in a number of published research projects and is actively deployed in the cloud. We welcome contributions from the open-source community.

Today I tested this python package with Windows 10 and Fedora Linux Distro with python versions 11 and 10 ...

This package does not work and you will see why ...

C:\PythonProjects\Open3D001>git clone https://github.com/isl-org/Open3D.git
Cloning into 'Open3D'...
remote: Enumerating objects: 67435, done.
remote: Counting objects: 100% (2280/2280), done.
remote: Compressing objects: 100% (1894/1894), done.
remote: Total 67435 (delta 886), reused 599 (delta 385), pack-reused 65155
Receiving objects: 100% (67435/67435), 237.23 MiB | 17.11 MiB/s, done.

Resolving deltas: 100% (50682/50682), done.
Updating files: 100% (2315/2315), done.

C:\PythonProjects\Open3D001>cd Open3D

C:\PythonProjects\Open3D001\Open3D>mkdir build

C:\PythonProjects\Open3D001\Open3D>cd build

C:\PythonProjects\Open3D001\Open3D\build>cmake -DBUILD_SHARED_LIBS=ON -DCMAKE_INSTALL_PREFIX=C:\open3d_install ..
-- Building for: Visual Studio 17 2022
-- Setting build type to Release as none was specified.
-- CMAKE_BUILD_TYPE is set to Release.
-- Downloading third-party dependencies to C:/PythonProjects/Open3D001/Open3D/3rdparty_downloads
CMake Deprecation Warning at CMakeLists.txt:189 (cmake_policy):
  The OLD behavior for policy CMP0072 will be removed from a future version
  of CMake.

  The cmake-policies(7) manual explains that the OLD behaviors of all
  policies are deprecated and that a policy should be set to OLD only under
  specific short-term circumstances.  Projects should be ported to the NEW
  behavior and not rely on setting a policy to OLD.

...

According to this issue number 4796 and my test on Windows 10 with a Python version greater than 10 and on Fedora Linux Distro you cannot use this python package.

You can try an older version of Python and try it, see this example:

C:\PythonProjects\Open3D001>C:\Python310\python.exe -m pip install --user open3d --no-warn-script-location
C:\PythonProjects\Open3D001>C:\Python310\python.exe -c "import open3d as o3d; print(o3d)"
Traceback (most recent call last):
 ...
    from open3d.cpu.pybind import (core, camera, data, geometry, io, pipelines,
ImportError: DLL load failed while importing pybind: A dynamic link library (DLL) initialization routine failed.
...
pip install pybind --user
Collecting pybind
  Using cached pybind-0.1.35.tar.gz (15.5 MB)
ERROR: Could not install packages due to an OSError: [WinError 206] The filename or extension is too 

long: 'C:\\Users\\catafest\\AppData\\Local\\Temp\\pip-install-7ccpzu3z\\pybind_

...

Basically, this python package cannot be used with an old python version in Windows 10.

Python 3.11.0 : Image generation with OpenAI.

In this tutorial I will show you a python script with PyQt6 and OpenAI that generates an image based on OpenAI token keys and a text that describes the image.

The script is quite simple and requires the installation of python packets: PyQt6,openai.

In the script you can find a python class called MainWindow in which graphic user interface elements are included and openai elements for generating images.

You also need a token key from the official openai page to use for generation.

The script runs with the command python numa_script.py and in the two editboxes is inserted chaie from token API OpenAI and the text that will describe the image to be generated.

This is the python script with the source code:

#create_image.py

import os
import openai

from PyQt6.QtCore import Qt, QSize
from PyQt6.QtGui import QImage, QPixmap
from PyQt6.QtWidgets import QApplication, QWidget, QLabel, QLineEdit, QVBoxLayout, QHBoxLayout, QPushButton
import requests

class MainWindow(QWidget):
    def __init__(self):
        super().__init__()
        self.resize(500, 500)
        self.setWindowTitle("AI Data Input")
        
        # create widgets
        self.image_label = QLabel(self)
        self.image_label.setFixedSize(QSize(300, 300))
        self.url_edit = QLineEdit(self)
        self.api_key = QLineEdit(self)
        self.send_button = QPushButton("Send data to AI", self)
        self.send_button.clicked.connect(self.on_send_button_clicked)
        
        # create layout
        layout = QVBoxLayout()
        url_layout = QHBoxLayout()
        url_layout.addWidget(QLabel("Text request AI: "))
        url_layout.addWidget(self.url_edit)
        api_layout = QHBoxLayout()
        api_layout.addWidget(QLabel("OpenAI API Key: "))
        api_layout.addWidget(self.api_key)

        layout.addLayout(url_layout)
        layout.addLayout(api_layout)
        layout.addWidget(self.image_label, alignment=Qt.AlignmentFlag.AlignCenter)
        layout.addWidget(self.send_button, alignment=Qt.AlignmentFlag.AlignCenter)
        
        self.setLayout(layout)
    
    def on_send_button_clicked(self):
        #openai.api_key = "your api key generated by OpenAI API"
        openai.api_key = self.api_key.text()
        PROMPT = self.url_edit.text()
        url = openai.Image.create(
            prompt=PROMPT,
            n=1,
            size="256x256",
        )

        # extract the url value
        url_value = url['data'][0]['url']
        if url_value :
            response = requests.get(url_value)
            if response.status_code == 200:
                image = QImage.fromData(response.content)
                pixmap = QPixmap.fromImage(image)
                self.image_label.setPixmap(pixmap)
                self.image_label.setScaledContents(True)

if __name__ == "__main__":
    app = QApplication([])
    window = MainWindow()
    window.show()
    app.exec()

This is the result of the source script:

Python 3.11.0 : clean from frequent folder and the list of recent files.

This python script that clears all entries in the Windows File Explorer from frequent folder and the list of recent files:

import os
import shutil

# Quick Access folder path on Windows
quick_access_path = os.path.join(os.environ['USERPROFILE'], 'AppData', 'Roaming', 'Microsoft', 'Windows', 'Recent', 'AutomaticDestinations')

# List all files in the Quick Access folder
files = os.listdir(quick_access_path)
print(files)
# Loop through all files in the Quick Access folder
for file in files:
    # Check if the file name contains "tmp" or "temp"
    if 'tmp' in file.lower() or 'temp' in file.lower():
        # Construct the full file path
        file_path = os.path.join(quick_access_path, file)
        # Delete the file
        os.remove(file_path)
        # Print a message to the console
        print(f"{file_path} deleted successfully.")

# Clear Frequent folder
frequent_folder = os.path.join(os.environ['APPDATA'], 'Microsoft', 'Windows', 'Recent', 'AutomaticDestinations')
os.system('del /f /q "{}\*"'.format(frequent_folder))

# Clear Recent files list
recent_folder = os.path.join(os.environ['APPDATA'], 'Microsoft', 'Windows', 'Recent')
os.system('del /f /q "{}\*"'.format(recent_folder))

Python 3.11.0 : testing discord application with python bot.

Today I opened the online discord and found that the Roblox bot works without problems, so I tested another python bot this time.

Discord settings are difficult for the application because they need to generate an authentication URL to your discord server.

Go to your applications area and select your application, see this webpage.

They ssay: "OAuth2 Use Discord as an authorization system or use our API on behalf of your users. Add a redirect URI, pick your scopes, roll a D20 for good luck, and go! ... Redirects You must specify at least one URI for authentication to work. If you pass a URI in an OAuth request, it must exactly match one of the URIs you enter here. "

I select my URL from my server discord then I set the In-App Authorization with SCOPES set to bot and applications.commands .

The source code for this bot needs to be able to send messages, select the Send Messages permission.

Select the permisions for Privileged Gateway Intents section:

The result of these settings will be an URL for authentification into GENERATED URL area.

Use this URL to make authentification with your discord server.

In my case the application and the server has the same name: catafest.

This is the source code I used in a python script named catafest_bot.py.

import discord
from discord.ext import commands

intents = discord.Intents.default()
intents.members = True

client = commands.Bot(command_prefix='!', intents=intents)

@client.event
async def on_ready():
    print('Bot is ready!')

@client.command()
async def send_message(ctx):
# Replace CHANNEL_ID with the ID of the channel you want to send the message
    channel = client.get_channel(CHANNEL_ID) 
    await channel.send('Hello there! This is a test message.') 

client.run('app_token')

I used pip tool to install the discord python package:

pip install discord --user

I run the script with python:

python catafest_bot.py
[2023-03-12 16:18:26] [WARNING ] discord.ext.commands.bot: Privileged message content intent is missing, commands may
not work as expected.
[2023-03-12 16:18:26] [INFO    ] discord.client: logging in using static token
[2023-03-12 16:18:27] [INFO    ] discord.gateway: Shard ID None has connected to Gateway (Session ID: 76b32c93c4...).
Bot is ready!

I used /msg to send the command to bot, !send_message:

The result on my server is this:

Python 3.11.0 : The yattag python package.

Yattag is a Python library for generating HTML or XML in a pythonic way.

You can find more information on the official webpage.

Installation can be done easily with the pip utility:

pip install yattag --user

I test a simple example code from the official documentation and works well:

from yattag import Doc

doc, tag, text = Doc(
    defaults = {
        'title': 'Untitled',
        'contact_message': 'You just won the lottery!'
    },
    errors = {
        'contact_message': 'Your message looks like spam.'
    }
).tagtext()

with tag('h1'):
    text('Contact form')
with tag('form', action = ""):
    doc.input(name = 'title', type = 'text')
    with doc.textarea(name = 'contact_message'):
        pass
    doc.stag('input', type = 'submit', value = 'Send my message')

print(doc.getvalue())

Python Qt5 : OpenStreetMap with PyQtWebEngine.

You need to install the PyQtWebEngine python package and to have the PyQt5 python package installed.

PyQt6 works in the same way as PyQt5 but with small differences ...

pip install PyQtWebEngine --user
Collecting PyQtWebEngine
  Downloading PyQtWebEngine-5.15.6-cp37-abi3-win_amd64.whl (182 kB)
     ---------------------------------------- 182.7/182.7 kB 580.6 kB/s eta 0:00:00
...
     ---------------------------------------- 60.0/60.0 MB 655.7 kB/s eta 0:00:00
...
Installing collected packages: PyQtWebEngine-Qt5, PyQtWebEngine
Successfully installed PyQtWebEngine-5.15.6 PyQtWebEngine-Qt5-5.15.2

import sys
from PyQt5.QtWebEngineWidgets import QWebEngineView
from PyQt5.QtWidgets import QApplication, QWidget, QVBoxLayout

class MapWidget(QWidget):
    def __init__(self, parent=None):
        super().__init__(parent)

        # Create a QWebEngineView object to display the map
        self.map = QWebEngineView()
        self.map.setHtml("""
            <!DOCTYPE html>
            <html>
                <head>
                    <meta name="viewport" content="width=device-width, initial-scale=1.0">
                    <style>
                        #map {
                            height: 100%;
                        }
                    </style>
                </head>
                <body>
                    <div id="map"></div>
                    <script src="https://openlayers.org/en/v4.6.5/build/ol.js"></script>
                    <script>
                        var map = new ol.Map({
                            target: 'map',
                            layers: [
                                new ol.layer.Tile({
                                    source: new ol.source.OSM()
                                })
                            ],
                            view: new ol.View({
                                center: ol.proj.fromLonLat([0, 0]),
                                zoom: 2
                            })
                        });
                    </script>
                </body>
            </html>
        """)

        # Create a QVBoxLayout to hold the map widget
        layout = QVBoxLayout()
        layout.addWidget(self.map)
        self.setLayout(layout)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    widget = MapWidget()
    widget.show()
    sys.exit(app.exec_())

The run of this python script will show a window with the OpenStreetMap map.

Python 3.11.0 : OpenCV - part 001.

A few years ago I made a series of several tutorials about python and OpenCV. They were functional, but I know that due to time, changes in development can lead to changes in the source code. Today I tested a script with this python package and it worked quite well.

In some cases, depending on the web camera and the operating system, the way of capturing images can be modified with the two specific elements: cv2.VideoCapture(cv2.CAP_DSHOW) or cv2.VideoCapture(cv2.CAP_V4L2)

This is the source code I used:

import cv2
import numpy as np
import time 

def draw_hist(name, gray):
    hist = cv2.calcHist([gray], [0], None, [256], [0,256])
    MAX = max(hist)
    plot = np.zeros((512,1024))
    for i in range(255):
        x1 = 4*i
        x2 = 4*(i+1)
        y1 = int(hist[i]*512/MAX)
        y2 = int(hist[i+1]*512/MAX)
        cv2.line(plot, (x1,y1), (x2,y2), 1, 3)
    cv2.imshow(name + "-gray", gray)
    cv2.imshow(name + "-hist", plot)


def main():
    cam = cv2.VideoCapture(0)
    #while cv2.waitKey(10) == -1:
    start_time = time.time()
    while time.time() - start_time < 30:
        ret, img = cam.read()
        if not ret:  # add check for empty image
            continue
        gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
        draw_hist("cam",gray)
        cv2.waitKey(10)

if __name__=="__main__":
    main()

This is the result:

Wednesday, March 1, 2023

Python 3.11.0 : The sunpy python package - part 002.

In the last article tutorial, I show some simple examples with the sunpy python package.

Today I installed it again with all of these python packages using the pip tool.

You don't need all of these if you just start, but in time you will need to install them:

pip install sunpy --user
Collecting sunpy
  Downloading sunpy-4.1.3.tar.gz (3.6 MB)
     ---------------------------------------- 3.6/3.6 MB 3.6 MB/s eta 0:00:00
     ...
     Successfully installed PyYAML-6.0 aioftp-0.21.4 astropy-5.2.1 pyerfa-2.0.0.1 sunpy-4.1.3
...
pip install zeep --user
Collecting zeep
  Using cached zeep-4.2.1-py3-none-any.whl (101 kB)  
  ...
  Successfully installed isodate-0.6.1 pytz-2022.7.1 requests-file-1.5.1 requests-toolbelt-0.10.1 zeep-4.2.1
  ...
pip install drms --user
Collecting drms
  Downloading drms-0.6.3-py3-none-any.whl (35 kB)
  ...
  Successfully installed drms-0.6.3 pandas-1.5.3
pip install hvpy --user
Collecting hvpy
  Downloading hvpy-1.0.1-py3-none-any.whl (44 kB)
     ---------------------------------------- 44.0/44.0 kB 359.5 kB/s eta 0:00:00
     ...
     Successfully installed hvpy-1.0.1
pip install scipy --user
Collecting scipy
  Downloading scipy-1.10.1-cp311-cp311-win_amd64.whl (42.2 MB)
     ---------------------------------------- 42.2/42.2 MB 7.4 MB/s eta 0:00:00
     ...
     Successfully installed scipy-1.10.1 
pip install glymur --user
Collecting glymur
  Downloading Glymur-0.12.2-py3-none-any.whl (2.7 MB)
     ---------------------------------------- 2.7/2.7 MB 4.2 MB/s eta 0:00:00
     ...
     Successfully installed glymur-0.12.2
     

Let's use the 1600 Angstrom from these all data of spectral range: 335 Angstrom, 131 Angstrom, 191-195 Angstrom, 211 Angstrom, 1600 Angstrom, 1700 Angstrom, 4500 Angstrom, 171-175 Angstrom, 304 Angstrom, 94 Angstrom

from datetime import datetime
from hvpy import createMovie, DataSource, create_events, create_layers
createMovie(
     startTime=datetime(2023, 2, 27),                    # start from 1st September 2022
     endTime=datetime(2023, 2, 28),                      # end at 5th September 2022
     layers=create_layers([(DataSource.AIA_1600, 100)]), # use AIA_193 Lens with 100% Opacity
     events=create_events(["CH"]),                      # show the Active regions
     eventsLabels=True,                                 # event labels should be included
     imageScale=1,                                      # Image scale in arcseconds per pixel
     hq=True,                                           # Download a higher-quality movie file
     timeout=10,                                        # Wait 10 minutes to get a response
     overwrite=True
)

The result is a video that looks like this :

There are easier ways to get information about the sun…

You can take one screenshot using the api.helioviewer.org feature in your browser.

https://api.helioviewer.org/v2/takeScreenshot/?imageScale=1&layers=[SDO,AIA,AIA,304,1,100]&events=&eventLabels=true&scale=true&scaleType=earth&scaleX=0&scaleY=0&date=2023-02-28T15:00:00.000Z&x1=-1100.0&x2=1100.0&y1=-1100.0&y2=1100.0&display=true&watermark=true&events=[CH,all,1]

You can find movies of the last two days of HMI magnetograms and intensitygrams on this webpage.

Subscribe to: Posts (Atom)