With python 3.7 I am trying to import functions which are defined in a module file. This module file is named mytool.py and contains
def foo():
    return 42
Following the solution I found on this page I have the main code mycode.py as follows:
from . import mytool
which yields an error
Traceback (most recent call last):
  File "mycode.py", line 3, in <module>
    from . import mytool
ImportError: attempted relative import with no known parent package
Is there a way to fix this as short and concise as possible, without having to add to sys.path?
 
    