例如,与我们在图书馆中寻找的书相关联的命名空间可以用来导入书本本身,就像这样: fromlibrary.second_floor.section_x.row_threeimportbook 我们从library命名空间开始,通过点(.)运算符,我们进入该命名空间。在这个命名空间中,我们寻找second_floor,再次使用.运算符进入它。然后我们进入section_x,最后在最后一个命名空间...
Python 拥有一个非常广泛的标准库(据说它是带有内置电池)。如果这还不够,全世界的 Python 社区维护着一系列第三方库,专门针对特定需求定制,你可以在Python Package Index(PyPI)上自由获取。当你编写 Python 代码时,你意识到你需要某个特定功能时,在大多数情况下,至少有一个库已经为你实现了该功能。 软件质量 Pyt...
For more on equality versus identity, seeEquality vs identityandWhen is equality the same as identity. String Representation An object's string representation determines what happens when Python converts that object to a string. All Python objects havetwo possible string representations: the user-read...
The asyncio package is billed by the Python documentation as a library to write concurrent code. However, async IO is not threading, nor is it multiprocessing. It is not built on top of either of these. In fact, async IO is a single-threaded, single-process design: it uses cooperative ...
Sometimes, the standard library doesn’t have what you need, or doesn’t do it in quite the right way. There’s an entire world of open source, third-party Python software. Good resources include the following: PyPi (also known as the Cheese Shop, after an old Monty Python skit) GitHub...
The SciPy package (as distinct from the SciPy stack) is a library that provides a huge number of useful functions for scientific applications. If you need to do work that requires optimization, linear algebra or sparse linear algebra, discrete Fourier transforms, signal processing, physical constant...
How to Publish Your Package on PyPIis for developers who have created a code library they would like to share and make installable for other developers. How to Submit a Package to PyPIpresents the basic steps like signing up for a PyPI account and other accounts that go along with the tuto...
Apr 4, 20254 mins Python video The power of Python's editable package installations Mar 28, 20255 mins Python InfoWorld wants to show you notifications You can turn off notifications at any time from your browser AcceptDo not accept Powered bysubscribers...
That is how the package Chardet — The Universal Character Encoding Detector works to identify one of 30 supported encodings. Chardet is a Python library that you can use in your programs, but also includes a command-line utility, chardetect. Here is what it reports on the source file ...
One library can provide both, but it means writing two entirely separate code paths and often two separate internal networking mechanisms, which is why you often see different libraries for sync versus async. There is, however, another way. Several core parts of Channels only provide asynchronous...