[Python]The import utilities in Python Standard Library

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ann@ann:~$ dpkg -l | grep python3 ii libpython3-dev:amd64 3.12.3-0ubuntu2 amd64 header files and a static library for Python (default) ii libpython3-stdlib:amd64 3.12.3-0ubuntu2 amd64 interactive high-level object-oriented language (default python3 version) ii libpython3.10-minimal:amd64 3.10.4-3 amd64 Minimal subset of the Python language (version 3.10) ii libpython3.10-stdlib:amd64 3.10.4-3 amd64 Interactive high-level object-oriented language (standard library, version 3.10) ii libpython3.12-dev:amd64 3.12.3-1ubuntu0.7 amd64 Header files and a static library for Python (v3.12) ii libpython3.12-minimal:amd64 3.12.3-1ubuntu0.7 amd64 Minimal subset of the Python language (version 3.12) ii libpython3.12-stdlib:amd64 3.12.3-1ubuntu0.7 amd64 Interactive high-level object-oriented language (standard library, version 3.12) ii libpython3.12t64:amd64 3.12.3-1ubuntu0.7 amd64 Shared Python runtime library (version 3.12) ii python3 3.12.3-0ubuntu2 amd64 interactive high-level object-oriented language (default python3 version) ii python3-apport 2.28.1-0ubuntu3.7 all Python 3 library for Apport crash report handling ii python3-apt 2.7.7ubuntu4 amd64 Python 3 interface to libapt-pkg ii python3-aptdaemon 1.1.1+bzr982-0ubuntu44 all Python 3 module for the server and client of aptdaemon ii python3-aptdaemon.gtk3widgets 1.1.1+bzr982-0ubuntu44 all Python 3 GTK+ 3 widgets to run an aptdaemon client ii python3-attr 23.2.0-2 all Attributes without boilerplate (Python 3) ii python3-babel 2.10.3-3build1 all tools for internationalizing Python applications - Python 3.x ii python3-bcrypt 3.2.2-1build1 amd64 password hashing library for Python 3 ii python3-blinker 1.7.0-1 all Fast, simple object-to-object and broadcast signaling (Python3) ii python3-bpfcc 0.29.1+ds-1ubuntu7 all Python 3 wrappers for BPF Compiler Collection (BCC) ii python3-brlapi:amd64 6.6-4ubuntu5 amd64 Braille display access via BRLTTY - Python3 bindings ii python3-cairo 1.25.1-2build2 amd64 Python3 bindings for the Cairo vector graphics library ii python3-certifi 2023.11.17-1 all root certificates for validating SSL certs and verifying TLS hosts (python3) ii python3-cffi-backend:amd64 1.16.0-2build1 amd64 Foreign Function Interface for Python 3 calling C code - runtime ii python3-chardet 5.2.0+dfsg-1 all Universal Character Encoding Detector (Python3) ii python3-click 8.1.6-2 all Wrapper around optparse for command line utilities - Python 3.x ii python3-colorama 0.4.6-4 all Cross-platform colored terminal text in Python - Python 3.x ii python3-commandnotfound 23.04.0 all Python 3 bindings for command-not-found. ii python3-configobj 5.0.8-3 all simple but powerful config file reader and writer for Python 3 ii python3-cryptography 41.0.7-4ubuntu0.1 amd64 Python library exposing cryptographic recipes and primitives (Python 3) ii python3-cups:amd64 2.0.1-5build6 amd64 Python3 bindings for CUPS ii python3-cupshelpers 1.5.18-1ubuntu9 all Python utility modules around the CUPS printing system ii python3-dateutil 2.8.2-3ubuntu1 all powerful extensions to the standard Python 3 datetime module ii python3-dbus 1.3.2-5build3 amd64 simple interprocess messaging system (Python 3 interface) ii python3-debconf 1.5.86ubuntu1 all interact with debconf from Python 3 ii python3-debian 0.1.49ubuntu2 all Python 3 modules to work with Debian-related data formats ii python3-defer 1.0.6-2.1ubuntu1 all Small framework for asynchronous programming (Python 3) ii python3-dev 3.12.3-0ubuntu2 amd64 header files and a static library for Python (default) ii python3-distro 1.9.0-1 all Linux OS platform information API ii python3-distro-info 1.7build1 all information about distributions' releases (Python 3 module) ii python3-distupgrade 1:24.04.26 all manage release upgrades ii python3-fasteners 0.18-2 all provides useful locks - Python 3.x ii python3-gdbm:amd64 3.12.3-0ubuntu1 amd64 GNU dbm database support for Python 3.x ii python3-gi 3.48.2-1 amd64 Python 3 bindings for gobject-introspection libraries ii python3-httplib2 0.20.4-3 all comprehensive HTTP client library written for Python3 ii python3-ibus-1.0 1.5.29-2 all Intelligent Input Bus - introspection overrides for Python (Python 3) ii python3-idna 3.6-2ubuntu0.1 all Python IDNA2008 (RFC 5891) handling (Python 3) ii python3-jinja2 3.1.2-1ubuntu1.3 all small but fast and easy to use stand-alone template engine ii python3-json-pointer 2.0-0ubuntu1 all resolve JSON pointers - Python 3.x ii python3-jsonpatch 1.32-3 all library to apply JSON patches - Python 3.x ii python3-jsonschema 4.10.3-2ubuntu1 all An(other) implementation of JSON Schema (Draft 3, 4, 6, 7) ii python3-jwt 2.7.0-1 all Python 3 implementation of JSON Web Token ii python3-launchpadlib 1.11.0-6 all Launchpad web services client library (Python 3) ii python3-lazr.restfulclient 0.14.6-1 all client for lazr.restful-based web services (Python 3) ii python3-lazr.uri 1.0.6-3 all library for parsing, manipulating, and generating URIs ii python3-louis 3.29.0-1build1 all Python bindings for liblouis ii python3-mako 1.3.2-1 all fast and lightweight templating for the Python 3 platform ii python3-markdown-it 3.0.0-2 all Python port of markdown-it and some its associated plugins ii python3-markupsafe 2.1.5-1build2 amd64 HTML/XHTML/XML string library ii python3-mdurl 0.1.2-1 all Python port of the JavaScript mdurl package rF python3-minimal 3.12.3-0ubuntu2 amd64 minimal subset of the Python language (default python3 version) ii python3-monotonic 1.6-2 all implementation of time.monotonic() - Python 3.x ii python3-nacl 1.5.0-4build1 amd64 Python bindings to libsodium (Python 3) ii python3-netaddr 0.8.0-2ubuntu1 all manipulation of various common network address notations (Python 3) ii python3-netifaces:amd64 0.11.0-2build3 amd64 portable network interface information - Python 3.x ii python3-netplan 1.1.2-2~ubuntu24.04.1 amd64 Declarative network configuration Python bindings ii python3-oauthlib 3.2.2-1 all generic, spec-compliant implementation of OAuth for Python3 ii python3-olefile 0.46-3 all Python module to read/write MS OLE2 files ii python3-paramiko 2.12.0-2ubuntu4.1 all Make ssh v2 connections (Python 3) ii python3-pexpect 4.9-2 all Python 3 module for automating interactive applications ii python3-pil:amd64 10.2.0-1ubuntu1 amd64 Python Imaging Library (Python3) ii python3-pip 24.0+dfsg-1ubuntu1.2 all Python package installer ii python3-pip-whl 24.0+dfsg-1ubuntu1.2 all Python package installer (pip wheel) ii python3-pkg-resources 68.1.2-2ubuntu1.2 all Package Discovery and Resource Access using pkg_resources ii python3-problem-report 2.28.1-0ubuntu3.7 all Python 3 library to handle problem reports ii python3-ptyprocess 0.7.0-5 all Run a subprocess in a pseudo terminal from Python 3 ii python3-pygments 2.17.2+dfsg-1 all syntax highlighting package written in Python 3 ii python3-pyparsing 3.1.1-1 all alternative to creating and executing simple grammars - Python 3.x ii python3-pyrsistent:amd64 0.20.0-1build2 amd64 persistent/functional/immutable data structures for Python ii python3-requests 2.31.0+dfsg-1ubuntu1.1 all elegant and simple HTTP library for Python3, built for human beings ii python3-rich 13.7.1-1 all render rich text, tables, progress bars, syntax highlighting, markdown and more ii python3-serial 3.5-2 all pyserial - module encapsulating access for the serial port ii python3-setuptools 68.1.2-2ubuntu1.2 all Python3 Distutils Enhancements ii python3-setuptools-whl 68.1.2-2ubuntu1.2 all Python Distutils Enhancements (wheel package) ii python3-six 1.16.0-4 all Python 2 and 3 compatibility library ii python3-software-properties 0.99.49.2 all manage the repositories that you install software from ii python3-speechd 0.12.0~rc2-2build3 all Python interface to Speech Dispatcher ii python3-sss 2.9.4-1.1ubuntu6.2 amd64 Python3 module for the System Security Services Daemon ii python3-systemd 235-1build4 amd64 Python 3 bindings for systemd ii python3-typing-extensions 4.10.0-1 all Backported and Experimental Type Hints for Python ii python3-tz 2024.1-2 all Python3 version of the Olson timezone database ii python3-uno 4:24.2.7-0ubuntu0.24.04.4 amd64 Python-UNO bridge ii python3-update-manager 1:24.04.12 all Python 3.x module for update-manager ii python3-urllib3 2.0.7-1ubuntu0.2 all HTTP library with thread-safe connection pooling for Python3 ii python3-wadllib 1.3.6-5 all Python 3 library for navigating WADL files ii python3-wheel 0.42.0-2 all built-package format for Python ii python3-xdg 0.28-2 all Python 3 library to access freedesktop.org standards ii python3-xkit 0.5.0ubuntu6 all library for the manipulation of xorg.conf files (Python 3) ii python3-yaml 6.0.1-2build2 amd64 YAML parser and emitter for Python3 ii python3.10-minimal 3.10.4-3 amd64 Minimal subset of the Python language (version 3.10) ii python3.12 3.12.3-1ubuntu0.7 amd64 Interactive high-level object-oriented language (version 3.12) ii python3.12-dev 3.12.3-1ubuntu0.7 amd64 Header files and a static library for Python (v3.12) ii python3.12-minimal 3.12.3-1ubuntu0.7 amd64 Minimal subset of the Python language (version 3.12) ii python3.12-venv 3.12.3-1ubuntu0.7 amd64 Interactive high-level object-oriented language (pyvenv binary, version 3.12)
最新发布
07-09
### Python LRU Cache Package Information In the context of Python, an LRU (Least Recently Used) cache is a type of memory management technique that discards the least recently used items first when the cache reaches its limit. The `functools` module within Python provides utilities for working with callable objects and functions; it includes support for creating decorators from simpler components as well as tools like `@lru_cache()` decorator which can be applied to any function or method. The implementation detail about where exactly this functionality resides depends on the version of Python being utilized. For instance, in older versions such as Python 2.6, one might find relevant code at File `/usr/lib/python2.6/site-packages/django/utils/lru_cache.py`, line 28[^1]. However, starting from Python 3.2 onwards, built-in support was added directly into the standard library via the `functools.lru_cache`. Here's how to use the `lru_cache`: ```python from functools import lru_cache @lru_cache(maxsize=128) def get_data(key): # Simulate data fetching operation here. pass ``` This example demonstrates decorating a simple function named `get_data`. By applying the `@lru_cache` decorator above the definition, each unique call will only execute once per process lifetime after which subsequent calls return cached results without re-execution until either the maximum size (`maxsize`) has been reached causing eviction based upon usage frequency or explicit invalidation occurs through other means provided by the API. For users who wish to work specifically with Django framework under legacy environments like Python 2.x series including but not limited to Python 2.7.3, installing third-party libraries becomes necessary since native caching mechanisms may lack advanced features found later. Installing packages like NumPy requires using pip toolchain appropriately configured against target environment specifications outlined previously [^2]. When facing challenges related to locating compatible binaries especially precompiled wheels (.whl files), alternative sources must sometimes serve as fallback options due to official repositories potentially discontinuing support over time. One notable community-driven archive exists offering historical builds maintained outside mainstream channels accessible online [^3].
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