Notice: While JavaScript is not essential for this website, your interaction with the content will be limited. Please turn JavaScript on for the full experience.
...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...
...reverse order, we could add this method: (4) sorted_items(by_value=0, 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 wo...
...Reverse Iteration Python 2.4 introduced the reversed builtin function for reverse iteration. The existing approaches to reverse iteration suffered from wordiness, performance issues (speed and memory consumption), and/or lack of clarity. A preferred style is to express the sequence in a forwards direction, apply 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[...
...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...
Version: None
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 …
View Release Notes
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 …
Location: Remote Any country
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 …
...reverse mapping def store(self, index, val): """dlict-special method to support indexed access""" self.empty[index] = None self.list[index] = val def delete(self, index): """dlict-special method to support indexed access""" self.empty[index] = 1 self.list[index] = None Compiler issues The compiler currently collects the names of all global variables in a module. These are names bound at the module level or bound in a class or function...
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. …
...reverse conversion (similar to binascii.hexlify): >> bytes([92, 83, 80, 255]).hex() '5c5350ff' The bytes object has some methods similar to list methods, and others similar to str methods. Here is a complete list of methods, with their approximate signatures: .__add__(bytes) -> bytes .__contains__(int | bytes) -> bool .__delitem__(int | slice) -> None .__delslice__(int, int) -> None .__eq__(bytes) -> bool .__ge__(bytes) -> bool .__getitem__(int | slice) -> int | by...
...reverse zip this way when the sequences are not all the same length. Reference Implementation Here is a reference implementation, in Python of the zip() built-in function. This will be replaced with a C implementation after final approval: def zip(*args): if not args: raise TypeError('zip() expects one or more sequence arguments') ret = [] i = 0 try: while 1: item = [] for s in args: item.append(s[i]) ret.app...
...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: ...
...reverse.py ... Filters/ Subpackage for filters __init__.py equalizer.py vocoder.py karaoke.py dolby.py ... Users of the package can import individual modules from the package, for example: import Sound.Effects.echo This loads the submodule Sound.Effects.echo. It must be referenced with its full name, e.g. Sound.Effects.echo.echofilter(input, output, delay=0.7, atten=4) from Sound.Effe...
...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....
...reverse operation? I.e. create a list of integer ASCII values from a string. Oh no, here we go again, it flashed through my mind... But this time, it was relatively painless. There are two candidates, the obvious: def g1(string): return map(ord, string) and the somewhat less obvious: import array def g2(string): return array.array('b', string).tolist() Timing these reveals that g2() is about five times as fast as g1(). There's a catch ...