the next iteration of your gui - europython next iteration of your gui pep 342 (coroutines via...
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THE NEXT ITERATION OF YOUR GUI
PEP 342 (Coroutines via Enhanced Generators) PEP 380 (Syntax for Delegating to a Subgenerator)
conceptive.be @erikjanssshore.be @jeroendierckxpython-camelot.com
WHAT'S GOING ONinteraction
TRADEOFFS
user friendlinesssimplicity of development
testability
TRADEOFFSuser friendliness
• use a progress indicator
• provide a cancel button
• respond to events
• similar controls as in other places
USER FRIENDLINESSOSX human interface guidlines
USER FRIENDLINESSMultithreaded toolkits - A failed dream?
Graham Hamiltonhttps://weblogs.java.net/blog/kgh/archive/2004/10/multithreaded_t.html
TRADEOFFSsimplicity of development
TRADEOFFStestability
TRADEOFFStestability
EXAMPLE APPLICATIONprocess pickinglist
PROCESS PICKINGLISTstep one. scan items in warehouse
example application
PROCESS PICKINGLISTstep two. import scanned lines
example application
PROCESS PICKINGLISTstep two. import scanned lines
example application
PROCESS PICKINGLISTstep three. verify import data
example application
PROCESS PICKINGLISTpossible issues. freeze
example application
PROCESS PICKINGLISTpossible issues. exceptions
example application
PROCESS PICKINGLISTshow and tell
example application
THE COMPETITION
user friendlinesssimplicity of development
testability
THE COMPETITION
TRADEOFFSuser friendliness
TRADEOFFStestability
TRADEOFFSsimplicity of development
user friendlinesssimplicity of development
testability
BALANCEvisual basic
THE COMPETITION
TRADEOFFSuser friendliness
TRADEOFFStestability
TRADEOFFSsimplicity of development
BALANCEjava
user friendlinesssimplicity of development
testability
PYTHONunique language features
PEP 255Simple generators
PEP 342Coroutines via Enhanced Generators
PEP 342Coroutines via Enhanced Generators
1. Redefine `yield` to be an expression2. Add a new send() method3. Add a new throw() method4. Allow "yield" to be used in try/finally blocks
PEP 342An application as a series of action steps
EXAMPLE APPLICATIONselect a file
PEP 342
• ChangeObject
• ChangeObjects
• PrintChart
• PrintPreview
• PrintHtml
ACTION STEPS
• PrintJinjaTemplate
•OpenFile
•OpenStream
•OpenJinjaTemplate
• CloseView
•MessageBox
• Refresh
•OpenFormView
• ShowPixmap
• ShowChart
• SelectFile
• SelectObject
out of the box in Camelot
EVENT LOOP INTEGRATIONUsing multiple threads to prevent freezes
EXAMPLE APPLICATIONimport data
event loop integration
EXCEPTIONSwait ... what?
EXAMPLE APPLICATIONuser cancels import
•get_collection
•get_selection
•get_object
WHAT'S THE CONTEXT
obligatory xkcd comic
TESTABILITY
UNITTESTINGexample application in action and code ...
THE SWEET SPOT
BALANCEpython (camelot)
user friendlinesssimplicity of development
testability
PEP 380delegating to a subgenerator
THE NEXT ITERATION OF YOUR GUI
PEP 342 (Coroutines via Enhanced Generators) PEP 380 (Syntax for Delegating to a Subgenerator)
python-camelot.com
conceptive.be @erikjanssshore.be @jeroendierckx
THE NEXT ITERATION OF YOUR GUI
PEP 342 (Coroutines via Enhanced Generators) PEP 380 (Syntax for Delegating to a Subgenerator)
python-camelot.comThanks !Questions ?
We’re hiring !
conceptive.be @erikjanssshore.be @jeroendierckx