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This article introduces the relevant knowledge of "what are the modules and packages in python". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

What are module and package?

Module: Module. In Python, a .py file is a module, which is a wrapper of classes, functions, and variables.

Package: Package. In Python, you can put multiple .py files into a folder, called a package. The package is the encapsulation of the module. A package can also contain subpackages.

What are the benefits of using module and package?

Easy to quote.

Avoid naming conflicts.

First, import module

Second, define the module

Third, define the package

1, simple package demonstration.

The package must contain the _ _ init__.py file, otherwise it will be treated as a normal folder.

The _ _ init__.py file can be empty or contain code.

The module name corresponding to the _ _ init__.py file is mycompany

The module name corresponding to the abc.py file is mycompany.abc

2. Demonstration of compound package.

Fourth, install the third-party module

Use the pip command on the command line, or you can add it to Jupyter notebook! Invokes command line instructions. Pip: come out of the shell.

Fifth, thinking practice

23. Read the following python code and design a matlab module that encapsulates datestr and datenum functions.

(reply keyword python23 for reference answer)

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