Results

• Unifying types and classes in Python 2.2

  ...object. The subclass __new__ can do two things to affect the resulting object: pass different arguments to the base class __new__, and modify the resulting object after it's been created (for example to initialize essential instance variables). __new__ must return an object. There's nothing that requires that it return a new object that is an instance of its class argument, although that is the convention. If you return an existing object, the constructor call will still call its __i...

• Unifying types and classes in Python 2.2

  ...object. The subclass __new__ can do two things to affect the resulting object: pass different arguments to the base class __new__, and modify the resulting object after it's been created (for example to initialize essential instance variables). __new__ must return an object. There's nothing that requires that it return a new object that is an instance of its class argument, although that is the convention. If you return an existing object, the constructor call will still call its __i...

• Unifying types and classes in Python 2.2

  ...object. The subclass __new__ can do two things to affect the resulting object: pass different arguments to the base class __new__, and modify the resulting object after it's been created (for example to initialize essential instance variables). __new__ must return an object. There's nothing that requires that it return a new object that is an instance of its class argument, although that is the convention. If you return an existing object, the constructor call will still call its __i...

• Unifying types and classes in Python 2.2

  ...object. The subclass __new__ can do two things to affect the resulting object: pass different arguments to the base class __new__, and modify the resulting object after it's been created (for example to initialize essential instance variables). __new__ must return an object. There's nothing that requires that it return a new object that is an instance of its class argument, although that is the convention. If you return an existing object of your class or a subclass, the constructor ...

• Incompatibilities between Python 2.1[.x] and 2.2[.x]

  ...objects have their im_class field set differently. In previous versions, the im_class field was set to the class that <i>defined</i> the method. Now it is set to the class that was used to create the method object. For example: <pre> class A: def meth(self): ... class B(A): ... # doesn't define meth class C(A): def meth(self): B.meth(self) # error, C doesn't inherit from B System Message: WARNING/2 (<string>, line 105) Definition list ends without a blank line...

• Known bugs in Python 2.2.1

  ...objects have their im_class field set differently. In previous versions, the im_class field was set to the class that <i>defined</i> the method. Now it is set to the class that was used to create the method object. For example: <pre> class A: def meth(self): ... class B(A): ... # doesn't define meth class C(A): def meth(self): B.meth(self) # error, C doesn't inherit from B System Message: WARNING/2 (<string>, line 89) Definition list ends without a blank line;...

• Incompatibilities between Python 2.1[.x] and 2.2[.x]

  ...objects have their im_class field set differently. In previous versions, the im_class field was set to the class that <i>defined</i> the method. Now it is set to the class that was used to create the method object. For example: <pre> class A: def meth(self): ... class B(A): ... # doesn't define meth class C(A): def meth(self): B.meth(self) # error, C doesn't inherit from B System Message: WARNING/2 (<string>, line 79) Definition list ends without a blank line;...

• Metaclasses in Python 1.5

  ...object is never callable. So what do Don and Jim do in order to use Don's hook? Write an extension that defines at least two new Python object types. The first would be the type for ``class-like'' objects usable as a base class, to trigger Don's hook. This type must be made callable. That's why we need a second type. Whether an object is callable depends on its type. So whether a type object is callable depends on its type, which is a meta-type. (In core Python there is only one...

• Python 2.0

  ...Object_GC_Init() after the initialization of the object's container attributes is complete. pyexpat adds 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 cr...

• 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...

• Comparing Python to Other Languages

  ...object-based" subset is roughly equivalent to JavaScript. Like JavaScript (and unlike Java), Python supports a programming style that uses simple functions and variables without engaging in class definitions. However, for JavaScript, that's all there is. Python, on the other hand, supports writing much larger programs and better code reuse through a true object-oriented programming style, where classes and inheritance play an important role. Perl Python and Perl come from a similar ...

• Job - CNO Python Software Engineer

  Location: Hanover US

  Requirements: I need someone who can demonstrate solid knowledge of Python and XML. The candidate should perform system and subsystem definition, preliminary and detailed design, design implementation, and subsystem and system integration and tests for a system. The role involves researching requirements for products, including CNO deployment environments, performance criteria, …

• Known bugs in Python 2.2

  ...objects have their im_class field set differently. In previous versions, the im_class field was set to the class that <i>defined</i> the method. Now it is set to the class that was used to create the method object. For example: <pre> class A: def meth(self): ... class B(A): ... # doesn't define meth class C(A): def meth(self): B.meth(self) # error, C doesn't inherit from B System Message: WARNING/2 (<string>, line 130) Definition list ends without a blank line...

• PSF-2006-001 - Buffer overrun in repr() for UCS-4 encoded unicode strings

  ...object-oriented programming language. It is often compared to Tcl, Perl, Scheme or Java.</p> <p>The Python development team has discovered a flaw in the repr() implementation of Unicode string objects which can lead to execution of arbitrary code due to an overflow in a buffer allocated with insufficient size.</p> <p>The flaw only manifests itself in Python builds configured to support UCS-4 Unicode strings (using the --enable-unicode=ucs4 configure flag). This is still n...

• Release – Python 3.9.13

  Version: None

  Released: May 17, 2022

  This is the thirteenth and final regular maintenance release of Python 3.9 Note: The release you're looking at is Python 3.9.13, a bugfix release for the legacy 3.9 series. Python 3.11 is now the latest feature release series of Python 3. Get the latest release of 3.11.x here. According …

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• Python Success Stories

  ...objects. There would be three kinds of objects in this tree: Configuration (the top-level object representing the entire configuration), Site (representing one of the sites to be polled) and User (representing user data attached to a site). The example file describes five site objects, each with one user object attached to it. I had already designed and written the three object classes (that's what took four days, most of it spent getting the layout of the widgets just right). Each had a method ...

• Python Success Stories

  ...definitions and style sheets, called Local.DTD and Local.DSL, respectively. These allow for the introduction of additional document elements, and their renderings, on top of those provided by DocBook. For example, some of the teams at my company wanted features in the final Word document that amounted to arbitrary Word field-code support in the SGML. To support this, I wrote a local DocBook stylesheet and definition file pair (Local.DSL, Local.DTD) to emit the sequences in RTF corresponding to t...

• Standard Exception Classes in Python 1.5

  ...Object *); int PyErr_GivenExceptionMatches(PyObject *, PyObject *); void PyErr_NormalizeException(PyObject**, PyObject**, PyObject**); PyErr_ExceptionMatches(exception) should be used in preference over PyErr_Occurred()==exception, since the latter will return an incorrect result when the exception raised is a class derived from the exception tested for. PyErr_GivenExceptionMatches(raised_exception, exception) performs the same test as PyErr_ExceptionMatches() but allows you to p...

• The Python 2.3 Method Resolution Order

  ...object, therefore diamonds are unavoidable and inconsistencies shows up in every multiple inheritance graph. The MRO of Python 2.2 makes breaking monotonicity difficult, but not impossible. The following example, originally provided by Samuele Pedroni, shows that the MRO of Python 2.2 is non-monotonic: >>> class A(object): pass >>> class B(object): pass >>> class C(object): pass >>> class D(object): pass >>> class E(object): pass >>> class ...

• Notes

  ...objects, the ljust(), center(), and rjust() methods now accept an optional argument specifying a fill character other than a space. When method objects have an attribute that can be satisfied either by the function object or by the method object, the function object's attribute usually wins. Christian Tismer pointed out that that this is really a mistake, because this only happens for special methods (like __reduce__) where the method object's version is really more appropriate than the functio...

Python language documentation

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