Module is a kind of .py It's a suffix python file , It can be understood as a well written python file , To use as a library file , Must include function ; Module name is this .py The name of the document . The name of the module as a global variable __name__ The value of , It can be acquired or imported by other modules .
The module is imported through import To achieve , The way to import the module is as follows ：import Specific module name
python The module is ：
Self contained and organized code snippets are modules .
In the form of ： Save the written code as a file . This file is a module .sample.py Where file name smaple Name the module .
#python View all installed modules in the environment
>>>help("modules")
Is a concept based on modules , Package the files for easy management . The first file in the package directory is init.py, Then there are some module files and subdirectories , Suppose there is one in the subdirectory init.py, So it's the sub package of this bag . A good application scenario for package files is ：
A The developer wrote an implementation x Functional modules , Name it perfect;
B Kaifa has written an implementation y Functional modules , Name it perfect;
C Users want to use y Functional modules , But because of the same name , The program cannot distinguish between two files . To solve the problem , Two files with the same name can be placed in packages with different package names , The specific module is determined by the combination of package name and file name .
The reference mode of specific modules in the package is ：import Package name . Module name
python Bag is ：
Package is a hierarchical file directory structure , It defines by n A module or n Composed of sub packages python Application execution environment .
More popular ： A package is a package that contains __init__.py File directory , There must be this in this directory __init__.py Files and other modules or sub packages .
Python The library in borrows the concept of other programming languages , There is no specific definition ,Python The library emphasizes its functionality . stay Python in , Modules and packages with certain functions can be called Libraries . The module consists of many functions , The package consists of many modular structures , Libraries can also contain packages 、 Modules and functions .
therefore ：python What is really used in is packages and modules , Library is a general term in an abstract sense .
python Kuo is ：
Refer to other programming languages , Is refers to python The code set that completes certain functions in , Code combinations for users . stay python Is in the form of packages and modules .
library ： With relevant functional modules （ package ） Set . This is also Python One of the major features of , That is, it has a strong standard library 、 Third party libraries and custom modules .
# View all installed third-party libraries and version numbers
(odc) [[email protected] testpy]# pip list
# View the details of a library
(odc) [[email protected] testpy]# pip show odc-stac
# View the help documentation for all third-party libraries
(base) [[email protected] ~]# python -m pydoc -p 0
Server ready at http://localhost:45998/
Server commands: [b]rowser, [q]uit
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