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python Programming Glossary: slotsWhy can't you add attributes to object in python? [duplicate] http://stackoverflow.com/questions/1285269/why-cant-you-add-attributes-to-object-in-python this behavior in a derived class class Foo object ... __slots__ ... f Foo f.bar 42 Traceback most recent call last File stdin.. object has no attribute 'bar' Quoting from the docs on slots ... The __slots__ declaration takes a sequence of instance variables.. attribute 'bar' Quoting from the docs on slots ... The __slots__ declaration takes a sequence of instance variables and reserves..
Can't set attributes of object class http://stackoverflow.com/questions/1529002/cant-set-attributes-of-object-class special mechanism for the purpose... class fint int ... __slots__ 'foobar' ... def __init__ self x self.foobar x 100 ... asizeof.asizeof.. surely much better than a dint . When the class has the __slots__ special attribute a sequence of strings then the class statement.. to have arbitrary attributes just a finite rigid set of slots basically places which can each hold one reference to some object..
Why the order in Python dictionaries is arbitrary? http://stackoverflow.com/questions/15479928/why-the-order-in-python-dictionaries-is-arbitrary Keys are hashed and hash values are assigned to slots in a dynamic table it can grow or shrink based on needs . And.. what is already there. Listing the contents loops over the slots and so keys are listed in the order they currently reside in..
multiprocessing GUI schemas to combat the “Not Responding” blocking http://stackoverflow.com/questions/15698251/multiprocessing-gui-schemas-to-combat-the-not-responding-blocking data from Worker # send data to Tab object with signals slots class Tab QTabWidget # spawn a thread separate from main GUI.. needed class Worker_thread QtCore.QThread # signals and slots are used to communicate back to the main GUI thread update_signal.. to use a thread to spawn a process and use signals and slots to update the GUI while the data is continuously retrieved by..
Threading in a PyQt application: Use Qt threads or Python threads? http://stackoverflow.com/questions/1595649/threading-in-a-pyqt-application-use-qt-threads-or-python-threads QThreads are better integrated with Qt asynchrnous signals slots event loop etc. . Also you can't use Qt from a Python thread..
How are Python's Built In Dictionaries Implemented http://stackoverflow.com/questions/327311/how-are-pythons-built-in-dictionaries-implemented figure below 0 1 ... i ... on the left are indices of the slots in the hash table they are just for illustrative purposes and.. n ... When a new dict is initialized it starts with 8 slots . see dictobject.h 49 When adding entries to the table we start.. it starts probing . Probing just means it searches the slots by slot to find an empty slot. Technically we could just go..
http://stackoverflow.com/questions/472000/python-slots __slots__ In Python when would I want to use __slots__ and when would.. __slots__ In Python when would I want to use __slots__ and when would I want to avoid it python share improve.. this question Quoting Jacob Hallen The proper use of __slots__ is to save space in objects. Instead of having a dynamic dict..
How would you implement a basic event-loop? http://stackoverflow.com/questions/658403/how-would-you-implement-a-basic-event-loop For the sake of learning I will implement my own signals slots and I would use those to generate custom events e.g. go_forward_event..
Background thread with QThread in PyQt http://stackoverflow.com/questions/6783194/background-thread-with-qthread-in-pyqt of QObject and therefore does # not provide signals and slots. class Runnable QtCore.QRunnable def run self count 0 app QtCore.QCoreApplication.instance..
Why is early return slower than else? http://stackoverflow.com/questions/8271139/why-is-early-return-slower-than-else slower. Edit A dictionary with 7 or 8 keys probably has 32 slots so on that basis without_else has a hash collision with __builtins__..
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