How do I import other functions in same module directory in Python?

Question

I made my python module which A.py uses B.py like below. In such a case, how do I import B.py in A.py? I want to use mylib module from other directory. But my code doesn't work because of path problem.

├── main.py
└── mylib
    ├── A.py
    ├── B.py
    ├── __init__.py
    └── main_in_mylib.py

A.py

import B
def test():
    B.hello()

B.py

def hello():
    print("hello from B")

main_in_mylib.py

import A
A.test()

main.py

import mylib.A as A
A.test()

Traceback (most recent call last):
  File "main.py", line 3, in <module>
    import mylib.A as A
  File "/home/jef/python-module/mylib/A.py", line 3, in <module>
    import B
ModuleNotFoundError: No module named 'B'

Updated

ModuleNotFoundError: No module named 'B'

# main.py
from mylib.A import test
test()

ModuleNotFoundError: No module named 'B'

# main.py
import mylib.B as B
import mylib.A as A
A.test()

The modules system in python is not always intuitive, but I think the link here will help you understand how things work. — Sigve Karolius
– Sigve Karolius, Commented May 10, 2017 at 7:10

Hans · Accepted Answer · 2017-05-10 10:52:36Z

4

you need to change A to

import mylib.B as B
def test():
    B.hello()

instead of

import B
def test():
    B.hello()

because imports are always relative to the script you call (in this case main.py)

edited May 10, 2017 at 10:52

answered May 10, 2017 at 7:07

Hans

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5 Comments

jef Over a year ago

This is not still clear. Could you check my updates? This may is not correct answer.

Hans Over a year ago

you need to do this import in A

jef Over a year ago

Thank you. Now my code is working. By the way, is it common way to import other functions in a such situation?

Azat Ibrakov Over a year ago

why not from mylib import B? aliasing seems to be redundant here

Hans Over a year ago

@AzatIbrakov I just wanted to keep with the style used in the original question

Pierre de Buyl · Accepted Answer · 2017-05-10 07:49:12Z

2

For the record it is also possible here to do a relative import in A.py:

from . import B

answered May 10, 2017 at 7:49

Pierre de Buyl

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1 Comment

jef Over a year ago

It looks useful because I don't need to set specific directory name.

Prakash Palnati · Accepted Answer · 2017-05-10 07:12:15Z

-1

The problem is you imported a file and trying to call methods using dot notation.

use from mylib.A import test

now you can directly use test() inside your main.py

in python3 you don't even have to write __init__.py inside a directory to tell that it is a package (it is a good practice though)

answered May 10, 2017 at 7:12

Prakash Palnati

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1 Comment

Prakash Palnati Over a year ago

Correction.. U can write from A import test

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