Qt for Python/GettingStarted/Windows

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The Qt library has to be built with the same version of MSVC as Python and PySide2, this can be selected when using the online installer.

Requirements

Building from sources on Windows 10

The following steps are performed on the command prompt (cmd) that is included with the MSVC2015 package, to include the proper compiler configuration. A 64bit infrastructure is assumed in the procedure, but if the host is a 32bit environment it is possible to just download the proper architecture packages. The packages used on this process are:

  • 7zip (7z1700-x64)
  • Git (Git-2.15.1.2-64)
  • CMake (cmake-3.10.2-win64-x64)
  • Python (python-3.6.4-amd64)
  • MSVC2015 (visualcppbuildtools_full)
  • CLANG (libclang-release_39-windows-vs2015_64.7z)
  • Qt 5.9.4 (qt-unified-windows-x86-3.0.2-online)

Setting up CLANG

http://download.qt.io/development_releases/prebuilt/libclang/libclang-release_39-windows-vs2015_64.7z
  • Extract the files, e.g. using 7zip
  • Move the directory libclang to any desire path, e.g c:\, and then set an environment variable with the new path:
set LLVM_INSTALL_DIR=c:\libclang

Getting PySide2

  • You must download git in order to clone the repository.
  • Cloning the official repository
git clone --recursive https://codereview.qt-project.org/pyside/pyside-setup
  • Checking out the version that we want to build, e.g. 5.9 (Keep in mind you need to use the same version as your Qt installation)
cd pyside-setup && git checkout 5.9

Building PySide2

  • You must download Python to build PySide2 (3.6 is recommended)
  • Check your Qt installation path, to specifically use that version of qmake to build PySide2.

e.g. E:\Qt\5.9.4\msvc2015_64\bin\qmake.exe

  • Build can take a few minutes, so it is recommended to use more than one CPU core (e.g. 8). Remember to replace the paths to your current qmake path:
python setup.py build --qmake=E:\Qt\5.9.4\msvc2015_64\bin\qmake.exe  --build-tests --ignore-git --jobs=8

Installing PySide2

  • To install on the current directory, just run:
python setup.py install --qmake=E:\Qt\5.9.4\msvc2015_64\bin\qmake.exe --build-tests --ignore-git --jobs=8

Test installation

  • You can execute one of the examples to verify the process is properly working.
  • Remember to properly set the environment variables for Qt and PySide2.
python examples/examples/widgets/widgets/tetrix.py

Development

Development happens in the 5.9 and dev branches of the pyside-setup repository. The top level repository has the following submodules:

  • sources/pyside2-tools: uic, rcc tools
  • examples/

Contributions follow the standard process. It is helpful to have debug binaries and/or symbols for Python available. On Windows, this is done by choosing Customized Installation when installing Python and ticking the respective check boxes. It is also recommended to use a Virtual Environment for testing to be able to always start from a clean base and avoid issues with write permissions in installations. On Windows an installation step may be required: 

python -m pip install virtualenv                                                       
python -m virtualenv testenv

The Virtual Environment is activated by· 

CALL testenv\Scripts\activate.bat

Before building the first time, the module Sphinx should be installed into the virtual environment:· 

pip install sphinx
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