Check if method is imported, from X import Y

Question

In Python 3.7 I would like to import few methos and use them later in the same script. Before that I would like to check if they are correctly imported.

Based on this answer I can check if a module is fully imported into the script but how if I imported only one method with the form from X import Y?

What I have done

I have done the following snippet:

from shapely.geometry import asShape
from shapely.geometry import Point
import sys

if 'shapely.geometry.asshape' in sys.modules:
  print('Shapely Geometry asshape ok')
else:
  print('Shapely Geometry asshape NOT loaded')
  
if 'shapely.geometry.point' in sys.modules:
  print('Shapely Geometry point ok')
else:
  print('Shapely Geometry point NOT loaded')

which gives me the following results:

Shapely Geometry asshape NOT loaded

Shapely Geometry point ok

Duplicate question

I don't this this is a duplicate question as all other questions here on SO are about check if a module is imported (with the form import Z) and not only some methods.

Answer 1

It doesn't matter whether you import just one function from a module, or import the whole module itself, whole module is always imported into sys.modules. So, in your case, you'll have to check for imported module instead of the function:

'shapely.geometry' in sys.modules

Check out this qustion 'import module' vs. 'from module import function'.