how to import class object in python from another file

Question

Suppose I have a directory with files classfile.py and a test_classfile.py

here's classfile.py

class Student:

     def __init__(self, fname, lname):
          self.firstname = fname
          self.lastname = lname

     def printname(self):
          return (self.firstname + self.lastname)


if __name__ == '__main__':
     s = Student('John', 'Doe')

What I'd like to do is import just the object s into the test_file.py

something like this,

from dir.classfile.Student import s


def test_classfile():
    assert str(s.printname()).isalpha()

I get the following error

ModuleNotFoundError: No module named 'dir.classfile.Student'; 'dir.classfile' is not a package

What do you think this line does? if __name__ == '__main__': There are other things wrong here but to me this is the most blatant one. — Axe319
– Axe319, Commented May 15, 2020 at 12:35

Yelyzaveta Velizhanina · Accepted Answer · 2020-05-15 12:38:30Z

1

As it is said 'dir.classfile' is not a package. If your .py files are both in the same directory, you just do 'import classfile'. Suppose the classfile.py was in the different directory, you would have to do the following:

import os.path
path_to_mods = os.path.abspath('path/to/classfile')
sys.path.insert(0, path_to_mods)
import classfile

You cannot import from 'Student' - this is an object. But you can import Student like this:

from classfile import Student

Also you cannot import instance of the class which is s. You should import the object like it it said above and then create an instance of it.

answered May 15, 2020 at 12:38

Yelyzaveta Velizhanina

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