Python is an interpreted, object-oriented, high-level programming language with dynamic semantics. Its high-level inbuilt data structures, combined with dynamic typing and dynamic binding, make it very attractive for Rapid Application Development, also on be used as a scripting or glue language to connect existing components together. Python’s simple, easy to seek out out syntax emphasizes readability and thus reduces the worth of program maintenance. Python supports modules and packages, which inspires program modularity and code reuse. The Python interpreter and thus the extensive standard library are available in source or binary form for free of charge of charge for all major platforms, and should be freely distributed.
Often, programmers fall crazy with Python thanks to the increased productivity it provides. Since there is no compilation step, the edit-test-debug cycle is incredibly fast. Debugging Python programs is easy: a bug or bad input will never cause a segmentation fault. Instead, when the interpreter discovers an error , it raises an exception. When the program doesn’t catch the exception, the interpreter prints a stack trace. A source level debugger allows inspection of local and global variables, evaluation of arbitrary expressions, setting breakpoints, stepping through the code a line at a time, and so on. The debugger is written in Python itself, testifying to Python’s introspective power. On the other hand, often the quickest because of debug a program is to feature a few of print statements to the source: the fast edit-test-debug cycle makes this easy approach very effective.
Python Latest Version check What’s New In Python 3.9
Summary – Release highlights
New syntax features:
PEP 584, union operators added to dict;
PEP 585, type hinting generics in standard collections;
PEP 614, relaxed grammar restrictions on decorators.
New built-in features:
PEP 616, string methods to urge obviate prefixes and suffixes.
New features within the quality library:
PEP 593, flexible function and variable annotations;
os.pidfd_open() added that allows process management without races and signals.
PEP 573, fast access to module state from methods of C extension types;
PEP 617, CPython now uses a replacement parser supported PEG;
a number of Python builtins (range, tuple, set, frozenset, list, dict) are now sped up using PEP 590 vectorcall;
garbage collection doesn’t block on resurrected objects;
a number of Python modules (_abc, audioop, _bz2, _codecs, _contextvars, _crypt, _functools, _json, _locale, math, operator, resource, time, _weakref) now use multiphase initialization as defined by PEP 489;
a number of ordinary library modules (audioop, ast, grp, _hashlib, pwd, _posixsubprocess, random, select, struct, termios, zlib) are now using the stable ABI defined by PEP 384.
New library modules:
PEP 615, the IANA zone Database is now present within the quality library within the zoneinfo module;
an implementation of a topological quite a graph is now provided within the new graphlib module.
Release process changes:
PEP 602, CPython adopts an annual release cycle.
You should check for DeprecationWarning in your code
When Python 2.7 was still supported, plenty of functionality in Python 3 was kept for backward compatibility with Python 2.7. With the highest of Python 2 support, these backward compatibility layers are removed, or are getting to be removed soon. Most of them emitted a DeprecationWarning warning for several years. as an example , using collections.Mapping instead of collections.abc.Mapping emits a DeprecationWarning since Python 3.3, released in 2012.
Test your application with the -W default command-line option to see DeprecationWarning and PendingDeprecationWarning, or even with -W error to treat them as errors. Warnings Filter are often used to ignore warnings from third-party code.
Python 3.9 is that the last version providing those Python 2 backward compatibility layers, to supply longer to Python projects maintainers to rearrange the removal of the Python 2 support and add support for Python 3.9.
Aliases to Abstract Base Classes within the collections module, like collections.Mapping alias to collections.abc.Mapping, are kept for one last release for backward compatibility. they go to be away from Python 3.10.
More generally, plan to run your tests within the Python Development Mode which helps to arrange your code to make it compatible with subsequent Python version.
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