Installing Qt.py (advanced methods)25 Jul 2016 #Python #Maya #Nuke #Qt.py #PySide #PyQt
Qt.py can be installed in many ways, depending on your needs. This post aims to outline some common approaches:
- Install using pip
- Install into an application’s custom Python build
- Make Qt.py available using
Install using pip
pip install Qt.py
Please also note that this method doesn’t automatically make Qt.py available in e.g. Maya or Nuke as those applications use their own distribution of Python.
If you want to be up really quickly with Qt.py you can also install PyQt5 which offers a wheel (!) for Python 3:
pip3 install PyQt5 Qt.py
Install into an application’s custom Python build
You can place the
Qt.py file manually within an application which comes with its own
site-packages folder (such as Maya or Nuke).
Windows: C:\Program Files\Autodesk\maya2017\Python\Lib\site-packages Linux: /usr/autodesk/maya2017/lib/python2.7/site-packages macOS: /Applications/Autodesk/maya2017/Maya.app/Contents/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages
Windows: C:\Program Files\Nuke10.0v1\lib\site-packages Linux: /usr/local/Nuke10.0v1/lib/python2.7/site-packages macOS: /Applications/Nuke10.0v2/Nuke10.0v2.app/Contents/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages
However, I actually don’t recommend this approach for a number of reasons (mostly risk of confusion):
- It’s no longer obvious, from reading your code, where Qt.py actually resides.
- It’s possible that you forget that you did put Qt.py here, and are trying to load a newer version of Qt.py via e.g. vendoring, but instead the Qt.py from within this custom Python build is being used.
- For every new version of this main application, you’d have to remember to re-install Qt.py.
You can download the
Qt.py file and bundle it with your application’s source tree. Something like this:
. ├── myapp.py └── vendor └── Qt.py
site package can be used to specify where Qt.py can be loaded from. For example,
myapp.py in the above source tree could use this to be able to use Qt.py:
# myapp.py import os import site QTPY_PATH = os.path.join(os.path.dirname(os.path.abspath(__file__)), 'vendor') site.addsitedir(QTPY_PATH) import Qt
Please note, you can use pip to install Qt.py into the vendor folder by specifying the
pip install --target=vendor Qt.py
You could also “vendor” a clone (or fork) of the Qt.py repository. This approach is nice if you intend to contribute to Qt.py and run tests. A Github repository will also offer the possibility to quite easily perform updates to Qt.py via
You can then bundle the Qt.py repository with your source tree and from within your Python script use e.g. the
site package to make Qt.py available.
git clone https://github.com/mottosso/Qt.py
. ├── myapp.py └── vendor └── Qt.py ├── build_caveats_tests.py ├── CAVEATS.md ├── CONTRIBUTING.md ├── Dockerfile ├── LICENSE ├── parser.py ├── Qt.py ├── README ├── tests.py └── tests.py
# myapp.py import os import site QTPY_PATH = os.path.join(os.path.dirname(os.path.abspath(__file__)), 'vendor', 'Qt.py') site.addsitedir(QTPY_PATH) import Qt
Make Qt.py available using
In cases where Qt.py is simply not found…
>>> import Qt Traceback (most recent call last): File "<stdin>", line 1, in <module> ImportError: No module named Qt
…you can make it available via e.g. the
site standard Python module:
>>> import site >>> site.addsitedir(PATH_TO_QTPY) >>> import Qt >>> print(Qt.__binding__) PySide2
Or you can add the Qt.py path to
>>> import sys >>> sys.path.append(PATH_TO_QTPY) >>> import Qt
>>> import sys >>> sys.path.insert(0, PATH_TO_QTPY) >>> import Qt