如何在python中导入模块

Question

I'm making a lambda function in python. Here is the current structure of my project.

lambda/
|-- package_name/
|   |-- __init__.py
|   |-- lambda_function.py
|   |-- a.py 
|   |-- utils.py
|
|-- tests/
|   |-- __init__.py
|   |-- test_main.py
|-- setup.py
|-- README

I would like to import lambda_function.py and a.py in test_main.py

I tried

from a import *
import a
from package_name import a

and some others, but nothing is working.

Could you explain me what is the right solution, and why what I tried actually deosn't work ?

Answer 1

If your working directory is lambda , try:

from package_name import a

There are some pre-determined places where python will look for packages. Usually the working directory is one of them.

See: https://leemendelowitz.github.io/blog/how-does-python-find-packages.html

Answer 2

I would recommend you to read about import in Python docs :
Python 3: https://docs.python.org/3/reference/import.html Python 2: https://docs.python.org/2/tutorial/modules.html

but you can import it relatively using : import * from ../package_name/a , import * from ../package_name/lambda_function

or you will need to add package_name folder to the sys.path and then just import * from a as you tried .

adding to sys.path could be done with :

import sys
module_path = "the path to your package_name"
sys.path.insert(0, module_path)

Answer 3

from ..package_name.lambda_function.a import *

您尝试的操作不起作用，因为您要访问的文件位于不同的目录中。