Analyze Python's method of importing modules in different levels of directories

This article mainlyintroducespython Methods of importing modules in different levels of directories, friends in need can refer to it

When using python for programming, Third-party module packages are often used. We can install this kind of package through python setup install and then import it through import XXX or from XXX import yyy. However, if it is a dependent package written by yourself and you do not want to install it in the corresponding directory of python, you can put it in this directory and import it for calling; in order to clarify the relationship between programs more clearly, for example, we will put this kind of package in Go to the lib directory and call again. This article summarizes common module calling methods.

1. The tunes in the same directory are

The program structure is as follows:

-- src
|-- mod1 .py
|-- test1.py

If you import the module mod1 in the program test1.py, directly use

import mod1
or
from mod1 import *;

2. Call the module in the subdirectory

The program structure is as follows:

-- src
| -- mod1.py
|-- lib
| |-- mod2.py
|-- test1.py

Now you see the test1.py and lib directories (That is, the parent directory of mod2.py). If you want to import the module mod2.py into the program test1.py, you can create an empty file init.py file in the lib folder (you can also define it yourself in this file) Output moduleInterface), then use:

from lib.mod2 import *

or
import lib.mod2.

3. Call the file in the upper directory

The program structure is as follows:

-- src

|-- mod1.py
|- - lib
|-- mod2.py
|-- sub
|-- test2.py

Here I want to implement test2.py calling mod1.py and mod2.py, the method is that we first jump to the src directory, directly call mod1, and then create an empty file init.py on the lib, and then import lib just like the second step of calling the module in the subdirectory. mod2 is called. The specific code is as follows:

import sys
sys.path.append("..")
import mod1
import mod2.mod2

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