[samuel@archdesk ~]$ pacman -Qs qt5
local/appstream-qt 0.10.6-1
    Qt5 interface for AppStream
local/attica-qt5 5.31.0-1 (kf5)
    Qt5 library that implements the Open Collaboration Services API
local/grantlee 5.1.0-1
    A string template engine based on the Django template system and written in Qt5
local/libdbusmenu-qt5 0.9.3+16.04.20160218-1
    A library that provides a Qt implementation of the DBusMenu spec
local/neovim-qt 0.2.4-1
    Neovim client library and GUI, in Qt5.
local/phonon-qt5 4.9.1-1
    The multimedia framework for KF5
local/phonon-qt5-gstreamer 4.9.0-1
    Phonon GStreamer backend for Qt5
local/plasma-framework 5.31.0-2 (kf5)
    Plasma library and runtime components based upon KF5 and Qt5
local/polkit-qt5 0.112.0+git20160226-1
    A library that allows developers to access PolicyKit API with a nice Qt-style API
local/poppler-qt5 0.52.0-1
    Poppler Qt5 bindings
local/pyqt5-common-debug 5.8-1
    Common PyQt files shared between python-pyqt5-debug and python2-pyqt5-debug
local/python-pyqt5-debug 5.8-1
    A set of Python 3.x bindings for the Qt5 toolkit
local/python-qscintilla-qt5 2.9.4-1
    Python 3.x bindings for QScintilla2
local/python-qscintilla-qt5-common 2.9.4-1
    Common python qscintilla bindings files shared between python-qscintilla-qt5 and python2-qscintilla-qt5
local/python2-pyqt5 5.8-1
    A set of Python 2.x bindings for the Qt5 toolkit
local/qca-qt5 2.1.3-1
    Qt Cryptographic Architecture
local/qscintilla-qt5 2.9.4-1
    A port to Qt5 of Neil Hodgson's Scintilla C++ editor class
local/qt5-base-debug 5.8.0-5.1 (qt qt5)
    A cross-platform application and UI framework
local/qt5-declarative 5.8.0-1 (qt qt5)
    Classes for QML and JavaScript languages
local/qt5-graphicaleffects 5.8.0-1 (qt qt5)
    Graphical effects for use with Qt Quick 2
local/qt5-location 5.8.0-1 (qt qt5)
    Provides access to position, satellite and area monitoring classes
local/qt5-multimedia 5.8.0-1 (qt qt5)
    Classes for audio, video, radio and camera functionality
local/qt5-quickcontrols 5.8.0-1 (qt qt5)
    Reusable Qt Quick based UI controls to create classic desktop-style user interfaces
local/qt5-script 5.8.0-1 (qt qt5)
    Classes for making Qt applications scriptable. Provided for Qt 4.x compatibility
local/qt5-sensors 5.8.0-1 (qt qt5)
    Provides access to sensor hardware and motion gesture recognition
local/qt5-serialport 5.8.0-1 (qt qt5)
    Provides access to hardware and virtual serial ports
local/qt5-speech 5.8.0-2 (qt qt5)
    Qt module to make text to speech and speech recognition easy
local/qt5-svg 5.8.0-1 (qt qt5)
    Classes for displaying the contents of SVG files
local/qt5-tools 5.8.0-1 (qt qt5)
    A cross-platform application and UI framework (Development Tools, QtHelp)
local/qt5-webchannel 5.8.0-1 (qt qt5)
    Provides access to QObject or QML objects from HTML clients for seamless integration of Qt applications with HTML/JavaScript clients
local/qt5-webengine-debug 5.8.0-2 (qt qt5)
    Provides support for web applications using the Chromium browser project
local/qt5-webkit-debug 5.8.0-1 (qt qt5)
    Classes for a WebKit2 based implementation and a new QML API
local/qt5-x11extras 5.8.0-1 (qt qt5)
    Provides platform-specific APIs for X11
local/qt5-xmlpatterns 5.8.0-1 (qt qt5)
    Support for XPath, XQuery, XSLT and XML schema validation
local/qt5ct 0.30-1
    Qt5 Configuration Utility
local/qtkeychain 0.7.0-1
    Provides support for secure credentials storage
local/quazip 0.7.3-1
    C++ wrapper for the Gilles Vollant's ZIP/UNZIP C package
local/qupzilla 2.1.1-1
    Cross-platform QtWebEngine browser
local/qutebrowser-git r11182.038a517c5-1
    A keyboard-driven, vim-like browser based on PyQt5 and QtWebKit
local/sonnet 5.31.0-1 (kf5)
    Spelling framework for Qt5
local/tensor-git r295.d01b8b8-1
    Cross-platform Qt5/QML-based Matrix client

[samuel@archdesk ~]$ uname -a
Linux archdesk 4.9.9-1-ARCH #1 SMP PREEMPT Thu Feb 9 19:07:09 CET 2017 x86_64 GNU/Linux

[samuel@archdesk ~]$ python --version
Python 3.6.0