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.

News : JupyterLab 4.0 released.

The Jupyter contributor community is proud to announce JupyterLab 4.0, the next major release of our full-featured development environment. The package is now available on PyPI and conda-forge. You can upgrade by running pip install --upgrade jupyterlab or conda install -c conda-forge jupyterlab.

You can read more on the official website.

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: