[Python] How do I export custom modules in python through __init__.py [duplicate]

I am trying to export a Python function from server -> utils -> math math.py old_div

import numbers


def old_div(a, b):
"""
Equivalent to ``a / b`` on Python 2 without ``from __future__ import
division``.
"""
instancetance(a, numbers.Integral) and isinstance(b, numbers.Integral):
return a // b
return a / b


I have created in utils __init__.py and put export from ..utils.math import old_div there so that I can export it to another directory. But I get an error:

File "f:\Balckhole\server\utils\__init__.py", line 1, in <module>
from ..utils.math import old_div
ImportError: attempted relative import with no known parent package


How could I resolve the error and export it -- I have the virtual environment set up. How could I solve this error?

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