In [1]:

    

pwd


    

    




/Users/mbp/Documents/my-project/python-snippets/notebook

In [2]:

    

python3 my_package/mod2.py


    

    




Traceback (most recent call last):
  File "my_package/mod2.py", line 1, in <module>
    from . import mod1
ImportError: cannot import name 'mod1' from '__main__' (my_package/mod2.py)






    

In [3]:

    

python3 -m my_package.mod2


    

    




from mod2
-- sub_mod1.func1 is called

In [4]:

    

cd my_package


    

In [5]:

    

pwd


    

    




/Users/mbp/Documents/my-project/python-snippets/notebook/my_package

In [6]:

    

python3 -m mod2


    

    




Traceback (most recent call last):
  File "/usr/local/Cellar/python/3.7.4/Frameworks/Python.framework/Versions/3.7/lib/python3.7/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/usr/local/Cellar/python/3.7.4/Frameworks/Python.framework/Versions/3.7/lib/python3.7/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/Users/mbp/Documents/my-project/python-snippets/notebook/my_package/mod2.py", line 1, in <module>
    from . import mod1
ImportError: attempted relative import with no known parent package