Python script not finding imported function

Question

I have 2 extremely simple python files. I am doing this as a test to see if blah2.py sees the updated version of the two variables initially declared as None after the 2 second sleep. The files are as below:

blah1.py

from time import sleep
import blah2

movingVariable1 = None
movingVariable2 = None

sleep(2)
movingVariable1 = "sup"
movingVariable2 = "blahhh"
blah2.myFunc()

blah2.py

from blah1 import movingVariable1
from blah1 import movingVariable2

def myFunc():
    global movingVariable1
    global movingVariable2
    print(movingVariable1)
    print(movingVariable2)

I am getting the following error though, and I'm not sure why.

 Traceback (most recent call last):
  File "blah1.py", line 2, in <module>
    import blah2
  File "/home/pi/blah2.py", line 1, in <module>
    from blah1 import movingVariable1
  File "/home/pi/blah1.py", line 10, in <module>
    blah2.myFunc()
AttributeError: module 'blah2' has no attribute 'myFunc'

myFunc() clearly is defined as a function though in blah2.py. Can anyone explain what I am doing wrong in this basic example?

A.Sha · Accepted Answer · 2020-06-01 03:28:33Z

1

You are creating a circular dependency in blah2.py

In your example blah1 imports blah2 which in turn imports blah1 which will again import blah2 and so on...

Make movingVariable & movingVariable2 parameters for myFunc and remove import of blah1.py in blah2.py.

Reply to follow-up

# blah1.py
from blah1 import movingVariable1
from blah1 import movingVariable2

def myFunc():
    global movingVariable1
    global movingVariable2
    print(movingVariable1)
    print(movingVariable2)

# blah2.py
from time import sleep

movingVariable1 = None
movingVariable2 = None

if __name__ =='__main__':
    import blah2
    sleep(2)
    movingVariable1 = "sup"
    movingVariable2 = "blahhh"
    blah2.myFunc()

If you change it like this it will work. Since when blah2 import blah1.py it does not see import blah2 since then __name__ will not be equal to __main__.

edited Jun 1, 2020 at 3:28

answered Jun 1, 2020 at 2:43

A.Sha

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2 Comments

user10150308 Over a year ago

Does just importing those 2 variables, not the whole blah1.py, still cause the circular dependency? I knew it would if I imported the entire file, but thought it wouldn't with just individual variables.

A.Sha Over a year ago

Please accept the answer if your problem was solved.

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