SystemError Parent module not loaded cannot perform relative import

Question

I have the following directory   myProgram  -- app      --   init   py      -- main py       -- mymodule py   mymodule py   class myclass object    def   init   self       pass  def myfunc self       print  Hello      main py   from  mymodule import myclass  print  Test   testclass   myclass   testclass myfunc     But when I run it  then I get this error   Traceback  most recent call last     File  D  Users Myname Documents PycharmProjects myProgram app main py   line 1  in  lt module gt      from  mymodule import myclass SystemError  Parent module    not loaded  cannot perform relative import   This works   from mymodule import myclass   But I get no auto completion when I type this in and there is a message   unresolved reference  mymodule  and  unresolved reference  myclass   And in my other project  which I am working on  I get the error   ImportError  No module named  mymodule    What can I do

User · Answer

I usually use this workaround   try      from  mymodule import myclass except Exception   ImportError     from mymodule import myclass   Which means your IDE should pick up the right code location and the python interpreter will manage to run your code

User · Answer

if you just run the main py under the app  just import like   from mymodule import myclass   if you want to call main py on other folder  use   from  mymodule import myclass     for example    -- app         --   init   py         -- main py         -- mymodule py  --   init   py  -- run py   main py  from  mymodule import myclass   run py  from app import main print main myclass    So I think the main question of you is how to call app main

User · Answer

I had the same problem and I solved it by using an absolute import instead of a relative one   for example in your case  you will write something like this   from app mymodule import myclass   You can see in the documentation      Note that relative imports are based on the name of the current   module  Since the name of the main module is always    main       modules intended for use as the main module of a Python application   must always use absolute imports

User · Answer

If you go one level up in running the script in the command line of your bash shell  the issue will be resolved  To do this  use cd    command to change the working directory in which your script will be running  The result should look like this    username localhost myProgram     rather than this    username localhost app     Once you are there  instead of running the script in the following format   python3 mymodule py   Change it to this   python3 app mymodule py   This process can be repeated once again one level up depending on the structure of your Tree diagram  Please also include the compilation command line that is giving you that mentioned error message

[python] SystemError: Parent module '' not loaded, cannot perform relative import

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