How to install pysqlite (python sqlite binding interface) on Ubuntu Linux

First you need development libraries:

$ sudo apt-get install libsqlite3-dev

Then you have to download pysqlite files from http://code.google.com/p/pysqlite/
Next steps are usual: unpack and change dir

After that run (you should have gcc - GNU C compiler - of course):

$ python setup.py build

After compilation runs successfully you are able to install pysqlite with:

$ sudo python setup.py install

That's all

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How to program SPI flash memory on Digilent Nexys4 and other 7th generation devices using Vivado 2014.x

Update: The methods described below work also on Vivado 2015! Please let me know if you had any issues with other Vivado versions. The information in the official user guides and tutorials seems to be fragmentary and sometimes out-of-date, that's why I decided to fill in this gap, not waiting for the official Xilinx updates. Our goal is to show how to program the SPI flash memory of the 7th generation Xilinx devices with Vivado 2014 on example of Nexys4 board. Note: before we start, we assume you already have a working project, that means the generated bitstream file works on your device. If not, you may want to go directly to the Program the SPI flash section to test your Nexys4 board with prepared .mcs file. Plan Configure the hardware to work with SPI flash memory Regenerate the bitstream file Convert the bitstream file into the "Prom" format Program the SPI flash Boot the device Configure the hardware to work with SPI flash memory ...

How to fix 'ImportError: cannot import name QtCore' on Debian Linux

What to do if such import error occurs? >>> import PySide >>> from PySide import QtCore Traceback (most recent call last): File "<stdin>", line 1, in <module> ImportError: cannot import name QtCore 1. Try to locate where your pyside is installed: $ locate PySide ... /usr/lib/python2.7/dist-packages/PySide /usr/lib/python2.7/dist-packages/PySide/__init__.py /usr/lib/python2.7/dist-packages/PySide/__init__.pyc /usr/lib/python2.7/dist-packages/PySide/phonon.so /usr/lib/python2.7/dist-packages/PySide/QtCore.so /usr/lib/python2.7/dist-packages/PySide/QtDeclarative.so /usr/lib/python2.7/dist-packages/PySide/QtGui.so /usr/lib/python2.7/dist-packages/PySide/QtHelp.so ... Hint: use this to update your file index: $ sudo updatedb 2. The solution is easy: add this to your ~/.bashrc (or ~/.<shell>rc you actually have). export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/lib/python2.7/dist-packages/PySide

Inkscape extension example

Recently, when preparing figures for publications using Inkscape, I decided to simplify my life. Some of the figures can be described as 2x2, 2x3, or even 2x6 grids. Sometimes it is very awkward to rearrange them if you decide to switch from 2x6 to 3x4 or vice versa. It would be nice to have an Inkscape extension, which will minimize the efforts. For the sake of simplicity we assume that all the elements are equal in width and should be rearranged symmetrically with respect to the vertical axis. Also, the element should be ordered according to its relative to the other elements location. The top left element is the first and the bottom right is the last one. So for example, you can visually prepare the elements and then tidy them up with a single click of our magic button. Hint : before developing a similar extension, you may want to check the standard Align and Distribute tool (Ctrl+Shift+A). Before writing any actual code let's take a look at some official Inkscape extensio...

The Concept of Creation

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