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Released: Oct. 2, 2023
This is the sixth maintenance release of Python 3.11 Python 3.11.6 is the newest major release of the Python programming language, and it contains many new features and optimizations. Major new features of the 3.11 series, compared to 3.10 Some of the new major new features and changes in Python …
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...Constant, Dict, literal_eval >>> nasty_dict = Dict(keys=[Constant(None)], values=[]) >>> literal_eval(nasty_dict) # Like eval("{None: }") {} In fact, the author has counted dozens of other call sites in Python's standard library and tooling where it would be appropriate to enable this new feature immediately. Rationale Some critics assert that constant boolean switches are a "code-smell", or go against Python's design philosophy. However, Python currently contains several ...
...constant development by hundreds of programmers around the world. This maintenance release brings important bug fixes from the community to all users of Python 2.3," said Guido van Rossum, creator of Python and president of the PSF. Python 2.3 is currently shipping with latest Apple's OS X release, and plays a key role in the technical infrastructure at companies such Google, Industrial Light & Magic, NASA, The New York Stock Exchange, Philips, Rackspace, RedHat, NASA, Disney, and m...
...constants and documenting them as constants in a checkable way. Creating a read-only attribute that may not be overridden by subclasses. (@property can make an attribute read-only but does not prevent overriding) Allowing a name to be used in situations where ordinarily a literal is expected (for example as a field name for NamedTuple, a tuple of types passed to isinstance, or an argument to a function with arguments of Literal type (PEP 586)). Specification The final decorator The typing.f...
Released: Jan. 14, 2022
This is the second maintenance release of Python 3.10 Python 3.10.2 is the newest major release of the Python programming language, and it contains many new features and optimizations. This is a special bugfix release ahead of schedule to address a memory leak that was happening on certain function calls …
...constant in a loop, copy it to a local variable before the loop. And in Python, function names (global or built-in) are also global constants! Try to use map(), filter() or reduce() to replace an explicit for loop, but only if you can use a built-in function: map with a built-in function beats for loop, but a for loop with in-line code beats map with a lambda function! Check your algorithms for quadratic behavior. But notice that a more complex algorithm only pays off for large N...
...constant modulus (in radix conversions for example) and are more properly coded as a loop. The example of splitting seconds into days/hours/minutes/seconds does not generalize to months and years; rather, the whole use case is handled more flexibly and robustly by date and time modules. The other use cases mentioned in the PEP are somewhat rare in real code. The proposal is also problematic in terms of clarity and obviousness. In the examples, it is not immediately clear that the argument or...
Released: July 11, 2022
This is a beta preview of Python 3.11 Python 3.11 is still in development. 3.11.0b4 is the fourth 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 to support …
...constant is now initialized using sysconf when possible, which eliminates a dependency on -lucb for Reliant UNIX. The md5 file should now compile on all platforms. The select module now compiles on platforms that do not define POLLRDNORM and related constants. Darwin (Mac OS X): Initial support for static builds on this platform. BeOS: A number of changes were made to the build and installation process. ar-fake now operates on a directory of object files. dl_export....
...constantly amazed at the depth and breadth of our customer base," says Stephan Deibel, co-Founder of Archaeopteryx Software, a leading vendor of Python development tools. "Python is being used in just about every imaginable domain, quite literally from soup factories to shipyards. Python is a solution that every programmer should at least be aware of." The first PyCon will be held 26-28 March, 2003, at George Washington University's Cafritz Conference Center in Washington DC. For those ...
...constants Max and Min address concerns for the constants to be self-documenting. What is commonly done to deal with absolute minimum or maximum values, is to set a value that is larger than the script author ever expects the input to reach, and hope that it isn't reached. Guido has brought up [2] the fact that there exists two constants that can be used in the interim for maximum values: sys.maxint and floating point positive infinity (1e309 will evaluate to positive infinity). However, each ha...
...constant adaptation to new Windows versions. Instead of porting the driver to new Windows versions -- at that time Windows NT was supported but we had urgent requests for Windows 2000 and XP was already visible on the horizon -- we decided to use standard internet protocols (UDP for the old monitoring node and TCP for the new one) for communication. For TTP-Load, which does not have performance requirements for the user interface, it was decided to rewrite the tool from scratch, entirely in Py...
...constant rate so I chose Python which was (and is) the highest level language I've ever seen that is also flexible enough to be generally useful." Architecture From the beginning, Timesheet was designed and implemented as a web application. It uses a three-tiered web application architecture with separate layers for web presentation, business logic, and data storage. As time has progressed, the application's functionality has advanced considerably, and Curt's decision to use Python for an...
...constant math.tau to the Python standard library. The concept of tau (τ) is based on the observation that the ratio of a circle's circumference to its radius is far more fundamental and interesting than the ratio between its circumference and diameter. It is simply a matter of assigning a name to the value 2 * pi (2π). PEP Acceptance This PEP is now accepted and math.tau will be a part of Python 3.6. Happy birthday Nick! The idea in this PEP has been implemented in the auspiciously named issue...
...constant default argument expressions. Potentially implementation of lambda expressions for describing default arguments. Keyword Argument Support Python supports the specification of particular function arguments by name, rather than by position. Goal: Implementation of a feature which allows keyword arguments to be used from Python for wrapped C++ functions. Generic C++ to Python Object Interface It is often necessary for C++ functions to manipulate objec...
...Constants Constants are usually defined on a module level and written in all capital letters with underscores separating words. Examples include MAX_OVERFLOW and TOTAL. Designing for Inheritance Always decide whether a class's methods and instance variables (collectively: "attributes") should be public or non-public. If in doubt, choose non-public; it's easier to make it public later than to make a public attribute non-public. Public attributes are those that you expect unrelated clients of ...
...constantly changing. Python repeatedly has allowed us to access, build and test our in-house communications with hundreds of travel suppliers around the world in a matter of days rather then the months it would have taken using other languages. Since adopting Python 2 years ago, Python has provided us with a measurable productivity gain that allows us to stay competitive in the online travel space," said Michael Engelhart, CTO of EZTrip.com. RealEstateAgent.com "Python in conjunct...
...constant: it is a set of the pixel formats supported by the Image class. Any image object that implements the new protocol is guaranteed to be formatted in one of these modes, but libraries that accept images are allowed to support only a subset of them. These modes are in turn also available as module level constants (e.g. imageop.RGB). The following table is a summary of the modes currently supported and their properties: Name Component names Bits per component Subsampling Valid inte...