# example.py
__all__ = ['print_details']

def print_public():
    print('this method is public')
    
def print_private():
    print('this method is private')

>>> from example import *
>>> print_public()
this method is public
>>> print_private()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'print_private' is not defined