将函数内部的变量传递给另一个Python文件

Question

I have a two python files which are classification_model.py and result.py . There is a function in classification_model.py file as

def learningbased():
    ann_accuracy = (metrics.accuracy_score(expected, predicted))

I want to get this ann_accuracy variable into result.py file.I used

from classification_model import *
from classification_model import learningbased

But it doesn't work. Can anyone tell me how can I do this.

Answer 1

good way: You can return the value of ann_accuracy in the function and call the function in result.py to get the value.

#classification_model.py:
def learningbased():
    ann_accuracy = (metrics.accuracy_score(expected, predicted))
    return ann_accuracy

#result.py
from classification_model import *
ann_accuracy = learningbased()

alternate way (use when desparate, no other solution): declare ann_accuracy as a global variable in classification_model.py. That way when you do from classification_model import * and call the function, you'll get the global variable in result.py

Answer 2

I think you should declare your project as a package, by adding a __init__.py file :

project_folder
    |_ __init__.py
    |_ classification_model.py
    |_ result.py

After doing that, in result.py you can do :

from . import classification_model
classification_model.learning_based()

It's a little different from what was already suggested and it enables you to have a clear organisation of your project.

Answer 3

Declare ann_accuracy as a global variable in classification_model.py. Use from classification_model import * , you can use/access the global variable in result.py.