What does python library mean?

The concept of a library is a collection of related functional modules. This is also one of the major features of Python, that is, it has a powerful standard library, third-party libraries and custom modules.

Module:

A complete Python file. In terms of physical organization, it is a file (such as math.py); in terms of logical organization, this file is a module (such as math).

The calling method is as follows (Method 1):

>>>import math

You can also call multiple modules at the same time (Method 2):

>>>import module_name1, module_name2, ……

At the same time, you can also directly call a function from the module (method 3):

>>>from module_name import function_name

Package:

package is an execution environment for a python application composed of modules and sub-packages, with folders Hierarchy. For example:

>>>AAA/
>>>   bbb.py
>>>   _int_.py
>>>   CCC/
>>>      c1.py
>>>      c2.py
>>>   DDD/
>>>      d1.py
>>>   ……

As can be seen from the above figure, package AAA contains both *.py modules and sub-packages such as CCC and DDD. If you call function func1 (located in c1.py), you can use the following code:

>>>import AAA.CCC.c1
>>>AAA.CCC.c1.func1()

When calling function func1 by this method, you need to indicate its location, that is, AAA.CCC.c1.func1(). If you want to use the function directly, you can use the following methods:

>>>from AAA.CCC.c1 import func1
>>>func1()

For more Python-related technical articles, please visit the Python Tutorial column to learn!

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