12/24/2022 0 Comments Image mixer 3 init file![]() Depending on the user's knowledge of C and compilers, and the user's operating system, this could become almost arbitrarily hairy. In the past, this burden was mostly on the user. To recap, the problem is that many Python packages rely on C code, which needs to be compiled before installation. Nowadays, pip install whatever will reliably install pretty much anything without any trouble. Very surprisingly, this is no longer the case. Installing Python packages used to be a pain. the downside of compilation is: no Windows support. But ever since wheels became ubiquitous and painless, and virtualenv was integrated into Python, and the development of PyEnv, these issues now have better solutions, and conda is no longer needed for my applications. ![]() Mind you, conda solved real problems back in the day (binary package distributions, Python version management, and environment management), and arguably still does (MKL et al, paid packages). I also like to use these official tools and packages instead of conda's parallel universe of mostly-open, mostly-free, mostly-standard replacements. I find this process much simpler, and easier to manage, because it relies on small, orthogonal tools (pyenv, venv, pip) instead of one integrated conda that kind of does everything. After that, you use Python's own venv and pip. Plus, it provides an easy and transparent way of switching between installed versions (including any system-installed versions). It downloads the sources from the official repos, and compiles them on your machine. This can be a version of CPython, PyPy, IronPython, Jython, Pyston, stackless, miniconda, or even Anaconda. In contrast, with PyEnv, you install a Python. Just like Anaconda, package managers want to be the true and only source of packages, and don't like to interact with Python's own package manager. For every package you install, you have to make a choice of using pip or conda, and the same goes for specifying your dependencies.Īs an aside, many of these complaints are just as true for package-manager-provided Python packages (which often break pip, too!). When you install packages through conda, you get binaries and source code from anaconda's servers, not the official packages from PyPi, which might or might not be up-to-date and feature-complete. Some features of conda require a login, some require a paid subscription. In the past, they once did break pip because they wanted to promote conda instead. So why would I choose PyEnv over the more popular Anaconda? Because Anaconda is a Python distribution, a package manager, an environment manager, and a platform for paid packages. The thing is: PyEnv installs (any version of) Python. I used to use Anaconda (or WinPython, or EPD) to do this. Instead, I like to install a separate Python in my home directory. That version is often outdated, and you risk messing with an integral part of your operating system. How to install Python? If your platform has a package manager, you might be tempted to use that to install Python. In particular, this changes the imports, replaces app.exec_() with app.exec(), and replaces mouseEvent.pos() with mouseEvent.position().toPoint() (see note in map11.py:). Update: As of April 2022, all code examples have been updated to use PySide6. The Qt for Python Video Tutorial by Bastian Bechtold is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. If you want to modify them or create derivative works, please contact me. Please do not upload them to social media or YouTube, but link to this website instead. You may also download the videos and share them with your friends. ![]() If the videos are too slow, feel free to speed them up by right-clicking, and adjusting play speed (Firefox only, as far as I know). It is a tutorial, in German, for building a small Qt GUI that visualizes the ongoing pandemic on a world map. This video series was produced in the spring of 2020, during the COVID19-pandemic, when all lectures had to be held electronically, without physical attendance. ![]()
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