PyQt5中的分段错误（核心转储）错误

Question

I just installed PyQt 5.7.0 on my google compute engine machine which running on a ubuntu 16.04:

However, when I wanted to run PyQt and import some module, it produce Segmentation fault (core dumped) error as shown:

Can I know how do I solve it? I have been searching an answer for this for hours and still can't find an answer. Will be greatly appreciated if anyone could help.

Answer 1

You can try (as explained in the comments) to compile PyQt5.7 yourself, using a different version of Python ( 3.4.3 and 3.4.4 worked for me, everything above 3.5 did not). Note that I also compiled Qt5.7 myself, but you can use the one provided by the installer. Here is a short, hopefully exhaustive, set of commands to setup a virtual environment:

Install dependencies using apt:

sudo apt-get install -y build-essential libgl1-mesa-dev libx11-dev libxext-dev libxfixes-dev libxi-dev libxrender-dev libxcb1-dev libx11-xcb-dev libxcb-glx0-dev libfontconfig1-dev libfreetype6-dev libglu1-mesa-dev libssl-dev libcups2-dev python3-pip git

Install Python 3.4.4:

cd ~/Downloads
wget https://www.python.org/ftp/python/3.4.4/Python-3.4.4.tar.xz
tar xf Python-3.4.4.tar.xz
cd Python-3.4.4
./configure
sudo make altinstall

Create the virtual environment:

sudo pip3 install virtualenv
virtualenv -p /usr/local/bin/python3.4 ~/python34
source ~/python34/bin/activate

Install Qt:

cd ~/Downloads
git clone git://code.qt.io/qt/qt5.git
cd ~/Downloads/qt5
git checkout 5.7
./init-repository
./configure -prefix ~/Qt/5.7/gcc_64 -opensource -nomake examples -nomake tests -release -confirm-license
make -j 5
make install

Install SIP:

cd ~/Downloads
wget http://downloads.sourceforge.net/project/pyqt/sip/sip-4.18.1/sip-4.18.1.tar.gz
tar xf sip-4.18.1.tar.gz
cd sip-4.18.1
python configure.py
make
sudo make install

Install PyQt:

cd ~/Downloads
wget http://downloads.sourceforge.net/project/pyqt/PyQt5/PyQt-5.7/PyQt5_gpl-5.7.tar.gz
tar xf PyQt5_gpl-5.7.tar.gz
cd PyQt5_gpl-5.7
python configure.py --qmake ~/Qt/5.7/gcc_64/bin/qmake --disable QtPositioning --no-qsci-api --no-designer-plugin --no-qml-plugin --confirm-license
make -j 5
sudo make install

Answer 2

Caveats:

• I'm going to assume that you can't run any GUI programs right now in your vm.
• I'm not that familiar with GCE platform and have not tried what I'm going to propose

Follow the steps at Your desktop on Google Cloud Platform to install a desktop GUI manager in the GCE vm (it will be X11-based for Linux OS), as well as vnc server.

Once you are vnc'd in to your vm using realvnc or tightvnc viewer, a GUI app will likely run. You may have to change the X11 DISPLAY variable -- eventhough the above link does not discuss this -- because AFAIR *nix systems use a separate desktop session for VNC than the one currently logged in.

I doubt it will run if there is no user logged on to the GCE vm.

Answer 3

If you installed PyQt5 with apt or apt-get, now do also

sudo pip3 install pyqt5

Answer 4

You cannot run a GUI program (PyQt) remotely, unless both machines use X11 protocol with properly set DISPLAY variables and xhost permissions. I doubt that Google compute engine is configurable to run in the X11 mode.

Answer 5

当你导入PyQt5时，它也会导入PyQt5.QtCore，因为PyQt5.QtCore是PyQt5的一部分。