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Benjamin Bandt-Horn

Unicode and new style string formatting ~ The Voidspace Techie Blog - 0 views

www.voidspace.org.uk/...arch_d7_2010_04_10.shtml

python print String Formatting unicode string

shared by Benjamin Bandt-Horn on 14 Dec 13 - No Cached
  • Unicode and new style string formatting Python 2.6 and Python 3 gain a new style of string formatting, which is apparently based on the string formatting in C#. I wasn't a big fan of the string formatting in C# and so wasn't very excited about it moving into Python, but as is to be expected it has grown a bit on me.
  • As always, the best solution is to not mix Unicode and byte-strings but to keep all strings in Unicode and only perform the encode when actually needed.
  • So why does this behaviour matter? Well it particularly matters for framework authors formatting messages based on 'user' input. This is the case with unittest, which creates error messages when tests fail. The error messages internally in unittest are byte-strings and they are often mixed with user supplied messages using string formatting. We use old-style (% based) formatting, so if the user supplies byte-strings then the resulting messages will be byte-strings. If the user supplies Unicode strings then the resulting messages will be in Unicode. Because all the internal unittest messages are ascii only we can guarantee than an implicit decode to Unicode will succeed - so the user can choose the output type by varying the type of the messages they provide.
  • Benjamin Bandt-Horn on 14 Dec 13
     
     Python 2.6 and Python 3 gain a new style of string formatting, which is apparently based on the string formatting in C#. I wasn't a big fan of the string formatting in C# and so wasn't very excited about it moving into Python, but as is to be expected it has grown a bit on me.
Benjamin Bandt-Horn

!performance - Python string formatting: % vs. .format - Stack Overflow - 0 views

stackoverflow.com/...on-string-formatting-vs-format

python

shared by Benjamin Bandt-Horn on 14 Dec 13 - No Cached
  • which is just ugly. .format doesn't have those issues. Also in the second example you gave, the .format example is much cleaner looking.
  • Benjamin Bandt-Horn on 14 Dec 13
     
    .format just seems more sophisticated in many ways. You can do stuff like re-use arguments, which you can't do with %. An annoying thing about % is also how it can either take a variable or a tuple
Benjamin Bandt-Horn

Mac OSX : How to burn an ISO image to a USB key - The Endless Geek - 0 views

endlessgeek.com/...burn-an-iso-image-to-a-usb-key

mac osx how to burn iso image usb key

shared by Benjamin Bandt-Horn on 09 Jan 16 - No Cached
  • Benjamin Bandt-Horn on 09 Jan 16
     
    If you have tried to create a bootable USB key from an iso image in Mac OSX using Disk Utility then you have probably encountered the frustrating and almost Windows-like cryptic error message "Could not validate source - Invalid argument" error. Looking in the system log via the Console app I suspect this is because internally DiskUtil tries to run /usr/sbin/asr to verify the image, which fails.   1 2 3 $ asr imagescan --source ubuntu-rescue-remix-12-04.iso only UDIF and NDIF images can be scanned. asr: image scan failed - Invalid argument. UDIF and NDIF are image formats used by Apple, and Disk Utility is pretty hopeless with anything that falls outside of these standards. The iso standard is short for ISO9660 and is a standard that defines the format of an image intended for burning to CD. Even after using hdutil to convert the image to UDRO (a UDIF Read-Only image) Disk Utility will still stubbornly refuse to help. Disk Destroyer Duplicator to the rescue Being Unix based, OSX has the command line dd utility available. Short for Disk Duplicator, dd is a block level reader/writer that makes raw copies from one file to another. But you want to copy the image to a device, right? That's fine, because everything in the world of Unix/Linux is a file - even devices. Informally referred to as Disk Destroyer, should you tell dd to output to the wrong device then your day is definitely going to be spoiled, so to avoid any mishaps we will make sure we know which devices on your system is your USB stick. You can determine this from the command line:
Benjamin Bandt-Horn

Rapid GUI Programming with Python and Qt - 0 views

www.qtrac.eu/pyqtbook.html

python qt book GUI PyQT library PySide

shared by Benjamin Bandt-Horn on 14 Jan 14 - Cached
  • From PyQt4.6, PyQt has two APIs, API#1 (the original), and API#2 (new). API#2 is more Pythonic and eliminates QString and QVariant, and is a bit nicer to use. API#1 remains best for those using PyQt to prototype C++/Qt applications. API#1 is the default for PyQt4.x with Python 2.x, and for PyQt4.0-4.5 with Python 3.x. API#2 is the default for PyQt4.6+ with Python 3.x, and for PySide.
  • most of the changes affect uses of QDataStream, QSettings, and QTextStream, and of course any use of QString methods (since in API#2, QString is gone, so we use str).
  • To convert any particular example to PySide the steps are as follows: Replace python3 in the first line with python. Add the following statements before the first import: from __future__ import division from __future__ import print_function from future_builtins import * Replace PyQt4 with PySide throughout (e.g., in the imports) If using Python 2.6 replace {} in format strings with {0}, {1}, etc., as appropriate. Add [0] at the end of every QFileDialog.*() function call. (In PyQt these return a—possibly empty—filename; in PySide they return a filename–filter 2-tuple, but all the examples only need the filename.) Replace QT_VERSION_STR with qVersion(). Replace PYQT_VERSION_STR with PySide.__version__; you will also need to add import PySide in the imports after the future imports. Replace @pyqtSignature with @Slot. Replace def isAlive(qobj): ... with def isAlive(qobj): return True. (There is currently no PySide equivalent.) Replace chr with unichr.
Benjamin Bandt-Horn

Game programming - Wikipedia, the free encyclopedia - 0 views

en.wikipedia.org/...Game_programming

game programming

shared by Benjamin Bandt-Horn on 12 Jan 14 - No Cached
  • The central component of any game, from a programming standpoint, is the game loop. The game loop allows the game to run smoothly regardless of a user's input or lack thereof. Most traditional software programs respond to user input and do nothing without it. For example, a word processor formats words and text as a user types. If the user doesn't type anything, the word processor does nothing. Some functions may take a long time to complete, but all are initiated by a user telling the program to do something. Games, on the other hand, must continue to operate regardless of a user's input. The game loop allows this. A highly simplified game loop, in pseudocode, might look something like this: while( user doesn't exit ) check for user input run AI move enemies resolve collisions draw graphics play sounds end while
  • Benjamin Bandt-Horn on 12 Jan 14
     
    The central component of any game, from a programming standpoint, is the game loop. The game loop allows the game to run smoothly regardless of a user's input or lack thereof.
Benjamin Bandt-Horn

''.format_map() in Python 2.x - 0 views

gist.github.com/1384338

python print format format_map

shared by Benjamin Bandt-Horn on 14 Dec 13 - No Cached
  • """''.format_map() in Python 2.x"""
  • Benjamin Bandt-Horn on 14 Dec 13
     
    ''.format_map() in Python 2.x
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