SystemError: Parent module ” not loaded, cannot perform relative import in Python

Dung Do Tien Aug 14 2021 42

Hello, I have created a small Python project with version 3.8.2 with struct as below:

PythonExample
└── app
    ├── main.py 
    └── demomodule.py

demomodule.py has the following piece of code:

class a(object):
 
  def __init__():
    #some code business here
 
  def func_a():
    #some code business here

In main.py, we will try to import the class a from demomodule.py. We will do that to create an object of class a from main.py.

To do that, we shall apply the following code in main.py:

from .demomodule import a
obj = a()
a.func_a()

But, the above piece of code may cause the following error:

SystemError: Parent module ” not loaded, cannot perform relative import

Traceback (most recent call last):
  File "C:/Users/Myname/Documents/Pythons/PythonExample/app/main.py", line 1, in <module>
    from .demomodule import a
SystemError: Parent module '' not loaded, cannot perform relative import

How can I resolve this issue?

Have 3 answer(s) found.
  • D

    Dương Trang Quốc Aug 14 2021

    You can try with absolute imports as below:

    from app.demomodule import a
    obj = a()
    a.func_a()

    I hope it solve for you.

  • y

    yaswanth Thamidallapati Aug 14 2021

    You can Solve the SystemError with exception handling:

    try:
      from .demomodule import a
    except Exception: 
      from demomodule import a

    It works for me

  • C

    CopterJS Aug 14 2021

    Sometimes I try import by using if/else condition as below:

    if __name__ ==  '__main__':
      from demomodule import a
    else:
      from .demomodule import a
    
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