This list of Python modules covers the core categories of Python modules, focusing on system operations, data processing, web development, databases, user interfaces, and multimedia tools. You’ll learn about built-in modules from the standard library and popular third-party packages that enhance Py...
As mentioned in “Python built-ins”, some modules are known as “built-in” because they are an integral part of the Python standard library (even though it takes an import statement to access them), as distinguished from separate, optional add-on modules, also called Python extensions. ...
The Python standard library was reorganized to make it easier and consistent. Many of the modules were renamed to conform to PEP 8 and unify file-naming conventions. Others merged to put related modules in a common namespace. This chapter explores some of the renamed and reorganized modules ...
There are a number of modules that are built into thePython Standard Library, which contains many modules that provide access to system functionality or provide standardized solutions. The Python Standard Library is part of every Python installation. Info:To follow along with the example code in th...
StringIOobjectsinmanyplaceswherePythonexpectsanordinaryfileobject. Typewrappers UserDict,UserList,andUserStringarethinwrappersontopofthecorrespondingbuilt-intypes. Butunlikethebuilt-intypes,thesewrapperscanbesubclassed.Thiscancomeinhandyifyouneeda classthatworksalmostlikeabuilt-intype,buthasoneormoreextramethods...
python解释器在启动时会自动加载一些模块,可以使用sys.modules查看 在第一次导入某个模块时(比如my_module),会先检查该模块是否已经被加载到内存中(当前执行文件的名称空间对应的内存),如果有则直接引用 如果没有,解释器则会查找同名的内建模块,如果还没有找到就从sys.path给出的目录列表中依次寻找my_module.py文件...
The time module provides various time-related functions. In Python, time is measured as the number of seconds since the epoch.The epoch is the beginning of time (the point at which time = 0 seconds).The epoch is January 1, 1970, on UNIX and can be determined by calling time.gmtime(0...
Python comes with a library of standard modules. Some modules are built into the interpreter; these provide access to operations that are not part of the core of the language but are nevertheless built in, either for efficiency or to provide access to operating system primitives such as system...
The time module provides various time-related functions. In Python, time is measured as the number of seconds since the epoch.The epoch is the beginning of time (the point at which time = 0 seconds).The epoch is January 1, 1970, on UNIX and can be determined by calling time.gmtime(0...
Chapter 4. Code Reuse: Functions and Modules Reusing code is key to building a maintainable system. And when it comes to reusing code in Python, it all starts and ends … - Selection from Head First Python, 2nd Edition [Book]