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...reversed() that makes a reverse iterator over sequence objects that support __getitem__() and __len__(). The above examples then simplify to: for i in reversed(xrange(n)): print seqn[i] for elem in reversed(seqn): print elem The core idea is that the clearest, least error-prone way of specifying reverse iteration is to specify it in a forward direction and then say reversed. The implementation could be as simple as: def reversed(x): if hasattr(x, 'keys'): raise ValueErro...
...reversed=0) I believe the most common case would actually be by_value=1, reversed=1, but the defaults values given here might lead to fewer surprises by users: sorted_items() would be the same as items() followed by sort(). Finally (as a last resort), we could use: (5) items_sorted_by_value(reversed=0) Implementation The proposed dictionary methods would necessarily be implemented in C. Presumably, the implementation would be fairly simple since it involves just adding a few calls to Pytho...
...reversed to the result, and then loop over the resulting fast, memory friendly iterator. Original code expressed with half-open intervals: for i in range(n-1, -1, -1): print seqn[i] Alternative original code reversed in multiple steps: rseqn = list(seqn) rseqn.reverse() for value in rseqn: print value Alternative original code expressed with extending slicing: for value in seqn[::-1]: print value Revised code using the reversed function: for value in reversed(seqn): print ...
...reversed() - a new builtin that takes a sequence and returns an iterator that loops over the elements of the sequence in reverse order (PEP 322) new sort() keyword arguments - sort() now accepts keyword arguments cmp, key and reverse sorted() - a new builtin sorted() acts like an in-place list.sort() but can be used in expressions, as it returns a copy of the sequence, sorted. string methods - strings gained an rsplit() method, and the string methods ljust(), rjust() and center() accept an argu...
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Released: Dec. 10, 2014
Python 2.7.9 is a bugfix version for the Python 2.7 release series. Python 2.7.9 includes several significant changes unprecedented in a "bugfix" release: The entirety of Python 3.4's ssl module has been backported for Python 2.7.9. See PEP 466 for justification. HTTPS certificate validation using the system's certificate store is …
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PEP 284 -- Integer for-loops PEP:284 Title:Integer for-loops Author:David Eppstein <eppstein at ics.uci.edu>, Greg Ewing <greg.ewing at canterbury.ac.nz> Status:Rejected Type:Standards Track Created:01-Mar-2002 Python-Version:2.3 Post-History: Contents Abstract Pronouncement Rationale Specification Issues Implementation References Copyright Abstract This PEP proposes to simplify iteration over intervals of integers, by extending the range of expressions allowed ...
Released: Feb. 6, 2024
This is the eighth maintenance release of Python 3.11 Python 3.11.8 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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Telecommuting: Yes
Are you on the hunt for exciting new challenges that boost your professional growth? If you’re a Full-stack Python Developer with extensive experience working with React, and willing to dive into intra-system complexity, we’d love to hear from you! Read on to see if you’d be a good fit for …
PEP 267 -- Optimized Access to Module Namespaces PEP:267 Title:Optimized Access to Module Namespaces Author:jeremy at alum.mit.edu (Jeremy Hylton) Status:Deferred Type:Standards Track Created:23-May-2001 Python-Version:2.2 Post-History: Contents Deferral Abstract Introduction DLict design Compiler issues Runtime model Backwards compatibility Related PEPs Copyright Deferral While this PEP is a nice idea, no-one has yet emerged to do the work of hashing out the differences be...
Released: Sept. 12, 2022
This is the second release candidate of Python 3.11 This release, 3.11.0rc2, is the last preview before the final release of Python 3.11.0 on 2022-10-24. Entering the release candidate phase, only reviewed code changes which are clear bug fixes are allowed between this release candidate and the final release. …
...reversed__() -> bytes .__rmul__(int) -> bytes .__setitem__(int | slice, int | iterable[int]) -> None .__setslice__(int, int, iterable[int]) -> Bote .append(int) -> None .count(int) -> int .decode(str) -> str | unicode # in 3.0, only str .endswith(bytes) -> bool .extend(iterable[int]) -> None .find(bytes) -> int .index(bytes | int) -> int .insert(int, int) -> None .join(iterable[bytes]) -> bytes .partition(bytes) -> (bytes, bytes, bytes) .pop([int]) ->...
PEP 201 -- Lockstep Iteration PEP:201 Title:Lockstep Iteration Author:barry at python.org (Barry Warsaw) Status:Final Type:Standards Track Created:13-Jul-2000 Python-Version:2.0 Post-History:27-Jul-2000 Contents Introduction Motivation Lockstep For-Loops The Proposed Solution Return Value Examples Reference Implementation BDFL Pronouncements Subsequent Change to zip() Other Changes References Copyright Introduction This PEP describes the 'lockstep iteration' proposal. This...
...reversed__() Supports reverse iteration by key. Questions and Answers What happens if an existing key is reassigned? The key is not moved but assigned a new value in place. This is consistent with existing implementations. What happens if keys appear multiple times in the list passed to the constructor? The same as for regular dicts -- the latter item overrides the former. This has the side-effect that the position of the first key is used because only the value is actually overwritten: ...
Built-in Package Support in Python 1.5 Built-in Package Support in Python 1.5 Starting with Python version 1.5a4, package support is built into the Python interpreter. This implements a slightly simplified and modified version of the package import semantics pioneered by the "ni" module. "Package import" is a method to structure Python's module namespace by using "dotted module names". For example, the module name A.B designates a submodule named B in a package named A. Just like...
...reversed the convention for adding newlines from requiring extra syntax to add a newline (ABC used trailing slashes to indicate newlines) to requiring extra syntax (the trailing comma) to suppress the newline. I kept the feature that items are separated by whitespace on output. Full example: in ABC, WRITE 1 WRITE 2/ has the same effect as: print 1, print 2 has in Python, outputting in effect "1 2n". I'm not 100% sure that the choice for a statement was right (ABC had the compelling reason t...
Python 2.5.4 Release Python 2.5.4 We are pleased to announce the release of Python 2.5.4 (final), a bugfix release of Python 2.5, on December 23rd, 2008. Python 2.5.4 has been replaced by a newer bugfix release of Python. Please download Python 2.5.6 instead, unless you need to use the Windows and OS X binaries provided here. This is the last bugfix release of Python 2.5. Future releases of Python 2.5 will only contain security patches; no new features are being added, and no "regular&...
Released: Dec. 23, 2008
This is the last bugfix release of Python 2.5. Future releases of Python 2.5 will only contain security patches; no new features are being added, and no "regular" bugs will be fixed anymore. According …
...reversed() builtin function that returns a reverse iterator over a sequence. Added a sorted() builtin function that returns a new sorted list from any iterable. CObjects are now mutable (on the C level) through PyCObject_SetVoidPtr. list.sort() now supports three keyword arguments: cmp, key, and reverse. The key argument can be a function of one argument that extracts a comparison key from the original record: mylist.sort(key=str.lower). The reverse argument is a boolean value and if True will...
...reversed(), sorted(), "".rsplit(), plus all features below 2.4 with statement, conditional expressions, combined try/except/finally, relative imports, yield expressions or generator.throw/send/close(), plus all features below 2.5 with statement without from __future__ import, io module, str.format(), except as, bytes, b'' literals, property.setter/deleter Backward Compatible Packages, Modules, and Tools Package/Module Maintainer(s) Python Version Notes 2to3 Benjamin Peterson 2....
Python Patterns - An Optimization Anecdote Warning This page stays here for historical reasons and it may contain outdated or incorrect information. The other day, a friend asked me a seemingly simple question: what's the best way to convert a list of integers into a string, presuming that the integers are ASCII values. For instance, the list [97, 98, 99] should be converted to the string 'abc'. Let's assume we want to write a function to do this. The first version I came ...