Results

• Metaclasses in Python 1.5

  ...constructor the same three arguments that are passed to the default class constructor or to an extension's metaclass: name, bases, and namespace. It is easy to be confused by what exactly happens when using a metaclass, because we lose the absolute distinction between classes and instances: a class is an instance of a metaclass (a ``metainstance''), but technically (i.e. in the eyes of the python runtime system), the metaclass is just a class, and the metainstance is just an instance. ...

• Standard Exception Classes in Python 1.5

  ...constructor, rather than passing value as a single argument (and an empty tuple calls the constructor without arguments). This makes a difference because there's a difference between f(a, b) and f((a, b)). These are all compromises - they work well with the kind of arguments that the standard exceptions typically take (like a simple string). For clarity in new code, the form raise class(argument, ...) is recommended (i.e. make an explicit call to the constructor). H...

• Unifying types and classes in Python 2.2

  ...definition of the save method would mean that a D instance, when requested to save itself, only saves the A and B parts of its data, but not the part of its data defined by class C! C++ notices that D inherits two conflicting definitions of method m, and issues an error message. The author of D is then supposed to override m to resolve the conflict. But what is D's definition of m supposed to do? It can call B's m followed by C's m, but because both definitions call the definition of...

• Unifying types and classes in Python 2.2

  ...definition of the save method would mean that a D instance, when requested to save itself, only saves the A and B parts of its data, but not the part of its data defined by class C! C++ notices that D inherits two conflicting definitions of method m, and issues an error message. The author of D is then supposed to override m to resolve the conflict. But what is D's definition of m supposed to do? It can call B's m followed by C's m, but because both definitions call the definition of...

• Unifying types and classes in Python 2.2

  ...definition of the save method would mean that a D instance, when requested to save itself, only saves the A and B parts of its data, but not the part of its data defined by class C! C++ notices that D inherits two conflicting definitions of method m, and issues an error message. The author of D is then supposed to override m to resolve the conflict. But what is D's definition of m supposed to do? It can call B's m followed by C's m, but because both definitions call the definition of...

• Unifying types and classes in Python 2.2

  ...definition of the save method would mean that a D instance, when requested to save itself, only saves the A and B parts of its data, but not the part of its data defined by class C! C++ notices that D inherits two conflicting definitions of method m, and issues an error message. The author of D is then supposed to override m to resolve the conflict. But what is D's definition of m supposed to do? It can call B's m followed by C's m, but because both definitions call the definition of...

• Towards a Standard Parser Generator

  ...definition file. Like YACC, YAPPS supports custom code before and after the grammar definition. YAPPS parsers integrate with the scanner through a Scanner object, which is passed to the parser as a constructor argument. Even though YAPPS supports definition of tokens in the grammar, we have not used this capability in XPath, since we have provided my own scanner class. The YAPPS parser will only require a token() method from the scanner object, which must return a four-tuple (start, e...

• Python 2.0

  ...definitions of PyModule_AddStringConstant and PyModule_AddObject if the Python version is less than 2.0, which provides compatibility with PyXML on Python 1.5.2. If the platform has a bogus definition for LONG_BIT (the number of bits in a long), an error will be reported at compile time. Fix bugs in _PyTuple_Resize() which caused hard-to-interpret garbage collection crashes and possibly other, unreported crashes. Fixed a memory leak in _PyUnicode_Fini(). Build issues ...

• Notes

  ...constructor, Message.add_payload(), Utils.dump_address_pair(), Utils.decode(), Utils.encode() New deprecations: Generator.__call__(), Message.get_type(), Message.get_main_type(), Message.get_subtype(), the 'strict' argument to the Parser constructor. These will be removed in email 3.1. Support for Python earlier than 2.3 has been removed (see PEP 291). All defect classes have been renamed to end in 'Defect'. Some FeedParser fixes; also a MultipartInvariantViolationDefect will be added to messag...

• Python 2.4.1 - Release Notes

  ...constructor, Message.add_payload(), Utils.dump_address_pair(), Utils.decode(), Utils.encode() New deprecations: Generator.__call__(), Message.get_type(), Message.get_main_type(), Message.get_subtype(), the 'strict' argument to the Parser constructor. These will be removed in email 3.1. Support for Python earlier than 2.3 has been removed (see PEP 291). All defect classes have been renamed to end in 'Defect'. Some FeedParser fixes; also a MultipartInvariantViolationDefect will be added to messag...

• Notes

  ...constructor would ignore all arguments. This is changed now: the constructor refuses arguments in this case. This might break code that worked under Python 2.2. The simplest fix is to add a no-op __init__: def __init__(self, *args, **kw): pass. Through a bytecode optimizer bug (and I bet you didn't even know Python had a bytecode optimizer :-), "unsigned" hex/oct constants with a leading minus sign would come out with the wrong sign. ("Unsigned" hex/oct constants are those...

• Notes

  ...definition in the nearest enclosing function scope will be used. One consequence of this change is that lambda statements could reference variables in the namespaces where the lambda is defined. In some unusual cases, this change will break code. In all previous version of Python, names were resolved in exactly three namespaces -- the local namespace, the global namespace, and the builtin namespace. According to this old definition, if a function A is defined within a function B, the names bo...

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