Snake

• Why Snake?
• It's Snake!
• Easy, but requires:
• Arrays
• Loops
• UI
• Input

Python

• Aims for readability
• "Scripting" language
• Dynamic types
• Familiar syntax...
• ...except blocks use whitespace

Python

"Executable pseudo-code"

names = "Bob", "Jill"

for name in names:
    print( name )

Python 3

The big unicode fix

• All strings are unicode
• May be encoded to/from bytes
• Wrinkles around I/O (necessarily)

Python 3

Iterators everywhere

for i in range( 10 ): # No list is created
    print( i )

More comprehensions

print( { i: i*i for i in range( 10 ) } )

# prints:
# {0: 0, 1: 1, 2: 4, 3: 9}

Python 3

New string formatting

msg = "Score: {0}".format( score )

Or using names

msg = "Score: {foo}".format( foo=score )

Python 3

Tidying

• print is a function
• Types and classes are unified
• super now behaves as it should
• Exception-catching syntax uses as
• input is the new raw_input
• Compare using key not cmp
• Lots of other small changes

Qt

• Widget toolkit (+ more)
• Cross-platform
• Used by Adobe, Skype, VLC, Spotify
• Base of KDE
• Proprietory and open licenses

Qt

• At home on C++
• Lots of language bindings
• Extends C++ with signals and slots

Qt

Very complete

• Full-featured canvas
• Multimedia
• Multi-touch
• Networking
• SQL
• Qt Creator IDE

Qt 5

• QML (JavaScript, effects)
• Android, iOS, WinRT, Blackberry
• OpenGL
• Broken into modules

Good bits (Python 3)

• Python 3 feels like Python
• I still love Python for small projects
• Unicode and string formatting are much better
• The tidy-ups all feel right

Good bits (Qt)

• Worked with little pain
• Canvas does resizing for you
• But had to subvert it to keep the model out of UI layer

Bad bits (Python)

Context: 12,000-line type-heavy Python 2 project, plus lots of smaller projects

• Lack of block endings impacts readability
• Lack of types:
  • Makes life harder in large programs
  • Makes code navigation and completion harder

Bad bits (Qt 5)

Context: totally new to Qt

• You must do things their way
• Python bindings have almost no docs
• Crash on exit, fixed by del window
• Proprietory license options

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