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python Programming Glossary: type.__new__What is a metaclass in Python? http://stackoverflow.com/questions/100003/what-is-a-metaclass-in-python name.upper val else uppercase_attr name val # reuse the type.__new__ method # this is basic OOP nothing magic in there return type.__new__.. method # this is basic OOP nothing magic in there return type.__new__ upperattr_metaclass future_class_name future_class_parents.. name.upper val else uppercase_attr name val return type.__new__ cls clsname bases uppercase_attr We can make it even cleaner..
How to wrap every method of a class in python? http://stackoverflow.com/questions/11349183/how-to-wrap-every-method-of-a-class-in-python of method newClassDict attributeName attribute return type.__new__ meta classname bases newClassDict class MyClass object __metaclass__..
How to make built-in containers (sets, dicts, lists) thread safe? http://stackoverflow.com/questions/13610654/how-to-make-built-in-containers-sets-dicts-lists-thread-safe dict_ methodname lockmethodfactory methodname lockattr cls type.__new__ mcls name bases dict_ return cls def __call__ self args kwargs.. dict_ methodname lockmethodfactory methodname lockattr cls type.__new__ mcls name bases dict_ return cls def __call__ self args kwargs..
Class-level read-only properties in Python http://stackoverflow.com/questions/1735434/class-level-read-only-properties-in-python classdict attr value.make_property return type.__new__ UniqeROType classname bases classdict class Foo object __metaclass__.. __new__ mcl a k ... uniquemcl type 'Uniq' mcl ... return type.__new__ uniquemcl a k ... class X __metaclass__ Meta ... class Y __metaclass__..
Metaclass not being called in subclasses http://stackoverflow.com/questions/1770712/metaclass-not-being-called-in-subclasses . As an alternative to using super one could use return type.__new__ cls name bases attrs The important thing is that we give cls..
why defined '__new__' and '__init__' all in a class http://stackoverflow.com/questions/2017876/why-defined-new-and-init-all-in-a-class which can be a new one typically that task is delegated to type.__new__ an existing one to implement singletons recycle instances from..
Final classes in Python 3.x- something Guido isn't telling me? http://stackoverflow.com/questions/2825364/final-classes-in-python-3-x-something-guido-isnt-telling-me ' is not an acceptable base type .format b.__name__ return type.__new__ cls name bases dict classdict class C metaclass Final pass class..
How do I concisely implement multiple similar unit tests in the Python unittest framework? http://stackoverflow.com/questions/347109/how-do-i-concisely-implement-multiple-similar-unit-tests-in-the-python-unittest f for f in funcs attrs 'test_gen_' f doTest f return type.__new__ cls name bases attrs class T unittest.TestCase __metaclass__..
Is there a way to set metaclass after the class definition? http://stackoverflow.com/questions/5120688/is-there-a-way-to-set-metaclass-after-the-class-definition def __new__ cls name bases dct dct test_var True return type.__new__ cls name bases dct def __init__ cls name bases dct super MetaClass..
nose, unittest.TestCase and metaclass: auto-generated test_* methods not discovered http://stackoverflow.com/questions/5176396/nose-unittest-testcase-and-metaclass-auto-generated-test-methods-not-discove arg arg func self arg attrs testable_name testable return type.__new__ cls name bases attrs class TestCase unittest.TestCase __metaclass__..
Can I get a reference to the 'owner' class during the __init__ method of a descriptor? http://stackoverflow.com/questions/6083708/can-i-get-a-reference-to-the-owner-class-during-the-init-method-of-a-descr pass class Meta type def __new__ cls name bases attrs obj type.__new__ cls name bases attrs # obj is now a type instance # this loop..
How to adapt the Singleton pattern? (Deprecation warning) http://stackoverflow.com/questions/6264025/how-to-adapt-the-singleton-pattern-deprecation-warning argument 2 given Gimmel suggest another solution _instance type.__new__ cls . For me it breaks the inheritance Traceback most recent.. Sumid src miscutil.py line 40 in __new__ _instance type.__new__ cls TypeError type.__new__ Settings Settings is not a subtype.. line 40 in __new__ _instance type.__new__ cls TypeError type.__new__ Settings Settings is not a subtype of type The same problem..
Lazy data-flow (spreadsheet like) properties with dependencies in Python http://stackoverflow.com/questions/8340289/lazy-data-flow-spreadsheet-like-properties-with-dependencies-in-python dependence_tree.update invert_tree inverted_tree return type.__new__ cls name bases dict_ if __name__ __main__ # Example and visual..
http://stackoverflow.com/questions/8618157/how-can-i-add-a-delay-to-every-method-in-a-python-sub-class-when-i-dont-want-to attribute newClassDict attributeName attribute return type.__new__ meta classname bases newClassDict return MetaClass def delayed..
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