most useful python modules

First, the moduleA module is a file that contains the Python definition and declaration, and the filename is the suffix of the module name plus the. Py.1, the Call of the module　　Call Syntax:import ... or from ... import ...　　invocation: the same module will not be re-imported (import statement can be used anywhere in the program, and for the same module import multiple times, in order to prevent you from repeating the import,

Python-common modulesThe Python module is the highest level program organization unit in Python. It encapsulates program code and data for reuse. In reality, modules often correspond to Python program files. The essence is to use some code to implement a set of certain funct

This article mainly introduces the modules and package concepts in Python. This article describes the Module Overview, Module namespace, import module, and import module attributes (from... Import ...) For more information, see Module Overview If the module organizes Python code logically, the file is the method for organizing the module on the physical layer.Th

Python prints the attributes of all objects/modules (instance code) and python instances. Example: Import sysdef print_all (module _): modulelist = dir (module _) length = len (modulelist) for I in range (0, length, 1): print getattr (module _, modulelist [I]) print_all (sys) The above python print out all the attri

[Python Basics] About packages, classes, modules, and python Reprinted please indicate the source: http://www.cnblogs.com/codefish/p/5032753.html Before I understood python packages, classes, and modules, I always compared them to dll, C # classes, and namespaces, this i

Module:Module Benefits: The first module can greatly improve the maintainability of the code, followed by the reduction of a large number of duplicate code, you can use the module to reuse some code. In addition, the module avoids collisions of function names and variable names.In Python, a. py file is called a module.Module Categories:Python standard library (built-in library)Third-party modulesApplication Custom ModulesImport ModuleNote: When the mo

(), basename () tuples OS. path. splitdrive () returns dirvename, pathname) tuples OS. path. splitext () returns the filename, extension) tuples. Information Getatime () returns the last access time Getctime () returns the File Creation Time Getmtime () returns the last file modification time Getsize () returns the object size in bytes) Query Exists () specifies whether the path file or directory exists Isabs () specifies whether the path is an absolute path Isdir () specifies whether the path

, minimum, average, and so on; comment:text some strings that are output in the specified chart; hrule:value# The RRGGBB is used to draw a horizontal line above the chart, vrule:time#rrggbb to draw vertical lines on the chart, line{1|2|3}:vname to plot the data chart with lines, {1|2|3} to represent the thickness of the line; Area: VName the area map to plot the data graph.4. Fetch methodFetch filename CF [--resolution|-r resolution] [--start|-s start] [--end|-e end] method, query according to t

A module is a function extracted to a file. This allows your to import the function and use it with any other code, may write. You'll learn how to create modules, import them, and make them stand-alone as you learn what if __name__ == “__main__” means in Python.If we excute the file in REPL, __bname__ are __main__, if we import the file as module, __name__ is file name.defTotal (n): Tax_rate=. 07returnn * tax_rate +NdefTax_amount (n): Tax_rate=. 07ret

Python 3.5 Released: New modules, optimized for performance, and more friendly to developersPython 3.5.0 officially released on September 13, compared with 3.4, what are the expectations of new features?PEP441, optimizing Python support for ZIP compression packages. Starting with version 2.6, Python supports a file or

# Built-in modules, third-party modules, custom modules#Which path does the import module base on? Sys.path#You can add a path by Sys.path.append ("); ImportSYSImportOS Project_path= Os.path.dirname (Os.path.dirname (Os.path.abspath (__file__)) ) sys.path.append (Project_path)#1.sys | Python interpretersys.argv comm

Unicode type. The type conversions from JSON to Python are compared as follows:Json.dumps method provides a lot of useful parameters to choose from, more commonly used have Sort_keys (Dict objects to sort, we know the default dict is unordered), separators,indent and other parameters.The sorting feature makes the stored data more useful for observation and also

deserialized to re-read the data.The Python object that was Pickle is also called serialization, as for why the name of the serialization, the foreigner from the I do not know, anyway, everyone is so called. However, since there is a serialization process, of course, there is deserialization, otherwise the saved file and how to read it. Deserialization is the use of the load function. The method is simple, so long as the saved file is opened in a rea