char, str; bytes, unicode, string
bytes = b"string"
str = chr(int)
Embed an interactive 3D plot in PyQt5
1) Create the FigureCanvas before adding the axes. See https://stackoverflow.com/a/9007892/3962328
canvas = FigureCanvas(fig)
ax = figure.add_subplot(111, projection='3d')
(Solved)Unable to launch C:\Miniconda3\Lib\site-packages\pyqt5_tools\bin\uic.exe
When I use Qt Designer, I want to view the corresponding python or c code(Form > View Code). However, the installed qt-designer cannot find uic module. I found the uic moudle(uic.exe) located in
C:\Miniconda3\Lib\site-packages\pyqt5_tools\uic.exe
Git Push to Two URL Simultaneously
git remote set-url --add --push origin git://original/repo.git
git remote set-url --add --push origin git://another/repo.git
Raspberry Pi New User Cannot Access GPIO
wiringPiSetup: Unable to open /dev/mem or /dev/gpiomem: Permission denied.
Aborting your program because if it can not access the GPIO
hardware then it most certianly won’t work
Try running with sudo?
sudo usermod -a -G gpio user_name
% change the owner and group respectively
sudo chown root.gpio /dev/gpiomem
sudo chmod g+rw /dev/gpiomem
WIN10内置Ubuntu子系统（WSL）出现中文方块乱码
sudo vim /etc/default/locale
Compile C Extension of Python on Windows
Unable to find vcvarsall.bat
Run PyQt5 in Ubuntu
qt.qpa.plugin: Could not load the Qt platform plugin “xcb” in “” even though it was found. This application failed to start because no Qt platform plugin could be initialized.
Use Code Snippets to Modify Your WordPress site
Sometimes, I found some tutorials for some wordpress problem. And it often ask you to change your functions.php or other source code.
Raspberry Pi, GPIO, Python, C/C++ Extension and wiringPi Connected
I used gpiozero and RPi.GPIO to control my 3D printer. However, the speed is quite slow. After some nervewracking thinking, I found it the python that cause the slow motion of those motors. Even I delete the time.sleep() line, it still run slowly. This give me no choice that I have to rewrite my control module into c code. After the rewriting, the problem finally solved.
In the c code, I choose wiringPi library to control the GPIO.
The numbering system of the gpiozero and RPi.GPIO with wiringPi is quite different. You should use
gpio readallto get the number map of your Pi.
Next you should wrap your c code in python.
Create a file test.c
and a file setup.py
Once the coding is finished, you should build and install you code. I suggest you install this in a virtual environment.
sudo apt install python-virtualenv
python setup.py build
python setup.py install
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