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• Python Success Stories

  ...type system, native support for common data structures (e.g., hash maps, sets, and lists), the "batteries-included" standard library, and sane error handling. Another reason we chose Python is that it is an excellent language for parsing as well as operating on collections with ease (iterating, concatenating, intersecting, etc.). Last but not least, if performance ever becomes an issue, it is easy to write extensions using the Python/C API. Understand that we did evaluate other solutio...

• Release – Python 3.9.0b3

  Version: None

  Released: June 9, 2020

  This is a beta preview of Python 3.9 Python 3.9 is still in development. This release, 3.9.0b3, is the third of five planned beta release previews. Beta release previews are intended to give the wider community the opportunity to test new features and bug fixes and to prepare their projects …

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• Notes

  ...types with partial orderings. Classes or types that want to implement (in)equality tests but not the ordering operators (i.e. unordered types) should implement == and !=, and raise an error for the ordering operators. It is possible to define types whose rich comparison results are not Boolean; e.g. a matrix type might want to return a matrix of bits for A < B, giving elementwise comparisons. Such types should ensure that any interpretation of their value in a Boolean context raises an excep...

• Release – Python 3.9.0b2

  Version: None

  Released: June 9, 2020

  WARNING: this release has a known regression See BPO-40924 for details. Use Python 3.9.0b3 or newer instead, please. This is a beta preview of Python 3.9 Python 3.9 is still in development. This release, 3.9.0b2, is the second of four planned beta release previews. Beta release previews are intended to …

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• Parade of the PEPs

  ...Type to Python - Zadka Like 228, I think this is not a realistic PEP, it's just a collection of open issues. A rational type seems to create more problems than it resolves. Maybe, just maybe there could be an efficient rational type implemented in C (using Python longs of course) in an extension module. But that's just a matter of hard work, and nobody seems interested. In the mean time, if you need rational numbers, there are plenty of implementations in pure Python available (in...

• Community Stories

  ...type annotations to Twine's codebase. This will make it easier for us to keep this code bug-free in the future, which means open source maintainers can have a smooth experience sharing their code with us on PyPI! Sumana Harihareswara, Changeset Consulting Grants Program My name is Iqbal and I have been using Python for 18 years. On a professional level Python as a programming tool has given me a career, and on a personal level as an ideology has helped me make friends and given me satisfactio...

• Python 2.4.1 - Release Notes

  ...type's coercion if both arguments have the same type but this type has the CHECKTYPES flag set. This is to better support proxies. The type of tp_free has been changed from "void (*)(PyObject *)" to "void (*)(void *)". PyObject_Del, PyObject_GC_Del are now functions instead of macros. A type can now inherit its metatype from its base type. Previously, when PyType_Ready() was called, if ob_type was found to be NULL, it was always set to &PyType_Type; now it is set to bas...

• Notes

  ...type's coercion if both arguments have the same type but this type has the CHECKTYPES flag set. This is to better support proxies. The type of tp_free has been changed from "void (*)(PyObject *)" to "void (*)(void *)". PyObject_Del, PyObject_GC_Del are now functions instead of macros. A type can now inherit its metatype from its base type. Previously, when PyType_Ready() was called, if ob_type was found to be NULL, it was always set to &PyType_Type; now it is set to bas...

• Python 2.0

  ...definition of NULL in C source code; all definitions were removed and add #error to Python.h if NULL isn't defined after #include of stdio.h. Py_PROTO() macros that were removed in 2.0b1 have been restored for backwards compatibility (at the source level) with old extensions. A wrapper API was added for signal() and sigaction(). Instead of either function, always use PyOS_getsig() to get a signal handler and PyOS_setsig() to set one. A new convenience typedef PyOS_sigha...

• The Python 2.3 Method Resolution Order

  ...type('Food',(),{'remember2buy':'spam'}) >>> E=type('Eggs',(F,),{'remember2buy':'eggs'}) >>> G=type('GoodFood',(F,E),{}) # under Python 2.3 this is an error! with inheritance diagram O | (buy spam) F | \ | E (buy eggs) | / G (buy eggs or spam ?) We see that class G inherits from F and E, with F before E: therefore we would expect the attribute G.remember2buy to be inherited by F.remberme...

• Notes

  ...types that support garbage collection. Compiler now treats None as a constant. The type of values returned by __int__, __float__, __long__, __oct__, and __hex__ are now checked. Returning an invalid type will cause a TypeError to be raised. This matches the behavior of Jython. Implemented bind_textdomain_codeset() in locale module. Added a workaround for proper string operations in BSDs. str.split and str.is* methods can now work correctly with UTF-8 locales. Bug #989185: unicode.iswide(...

• Python Success Stories

  ...type from a conformant dictionary. class_sig = toclass.__dict__.keys(); class_sig.sort() dict_keys = fromdict.keys(); dict_keys.sort() common = intersect(class_sig, dict_keys) if 'typemap' in class_sig: class_sig.remove('typemap') if tuple(class_sig) != tuple(dict_keys): print "Conformability error" # print "Class signature: " + `class_sig` # print "Dictionary keys: " + `dict_keys` print "Not matched in cl...

• Python Humor

  ...type of snake, which you'll notice is an object. With the two vowels, python is quite readable. Python Object Oriented Programming Seminar Subject: Re: Fall Python Workshop & OOPSLA? From: Joseph Strout <@ucsd.edu> Date: Fri, 28 Feb 1997 09:24:41 -0800 On Tue, 25 Feb 1997, Jeffrey Kunce wrote: > At last Fall's workshop, there was talk of combining the 1997 > Fall Python Workshop with OOPSLA in some way. > > Have there been any developments? I suggested holding...

Python language documentation

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