为什么我不能从模块目录内部和外部导入模块？

Question

My current project has the following structure:

src:
   file1.py
   file2.py

There are some functions in file2 which I would like to import into file1 and use. So the file 1 has the following lines:

from file2 import func1, func2

When run the terminal in the src directory and type:

from file1 import *

everything works well. However, when go outside the directory src, and type in the python terminal

from src.file1 import *

I get the following error:

    Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/bhavincvts/Desktop/greenleap/solarAFD1/src/file1.py", line 3, in <module>
    from file2 import func1, func2 
ModuleNotFoundError: No module named 'file2'

After that, I tried changing the import statement to,

from .file2 import func1, func2

it then works well from outside the src folder. But when running the terminal inside the src folder, it shows the following error:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/bhavincvts/Desktop/greenleap/solarAFD1/src/file1.py", line 3, in <module>
    from .file2 import func1, func2 
ImportError: attempted relative import with no known parent package

Is there anyway to fix this?

Answer 1

got it;

file1.py:

from file2 import func1, func2
func1()
func2()

file2.py has the functions:

def func1():
    print('yeeeeah func1')

def func2():
    print('yeeeah func2')

src: __init__.py file1.py file2.py

from src:

src$ python file1.py 

Prints:

yeeeeah func1
yeeeah func2

from somewhere else:

src$ cd ..
test_stack$ python src/file1.py 

Prints:

yeeeeah func1
yeeeah func2

Assuming src is your main directory (where setup.py requirements.txt etc live)

Answer 2

In file1, before you import the functions from file2, you can specify the directory of file2:

import sys
sys.path.append("/path_to_the_directory_that_can_find_file2")

from file2 import func1, func2

This should make it more robust against running outside the src directory.