如果从另一个文件夹执行模块，python 3.6无法解析导入

Question

I have folder and code structure like this

root folder
|
|---core folder
|     |
|     |----transaction.py
|     |            
|     |----executetransaction.py       
|
|---test folder
      |
      |----test_execute_transaction.py

transaction.py

class Transaction:
    def __init__(self,json):
        print("in create object")

executetransaction.py

from transaction import Transaction

def execute_transaction(json):
    trsobj = Transaction(json)

test_execute_transaction.py

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

from core import executetransaction
executetransaction.execute_transaction({"a":"b"})

when I execute test_execute_transaction , it is able to import executetransaction from core folder but I get ModuleNotFoundError: No module named 'transaction' on the import code line in executetransaction module.

If I run execute_transaction({"a":"b"}) in executetransaction module then transaction is imported as expected and I get "in create object" .

I have added empty __init__.py in all folders.

This is my first time posting question here, please tell me if more details are required.

Answer 1

This may help you Using local imports

When importing the package, Python searches through the directories on sys.path looking for the package subdirectory. docs.python.org/3/tutorial/modules

Answer 2

Ok your problem is how you import the transaction module in executetransaction.py.

Change from transaction import Transaction to from .transaction import Transaction . The dot operator tells python that you're wanting to import from the current package.