__init__.py file in python
# __init__.py
# you can comment here about your package.
# you can also add external libraries to your package.
# for example:
import numpy
import pandas
# you can also add your package information in this file.
__version__ = '2.1.1'
__author__ = 'Depressed Dingo'
# __all__ make others able to access to this datas by importing our package.
__all__ = ['numpy', 'pandas', '__version__', '__author__']
# -----------------------------------------
# main.py
# example of using this.
from test_package import *
# or
from test_package import numpy
print(__auther__) # --> Depressed Dingo