Definitions

Under your package folder:

__init__.py

• file in Python serves a crucial role when building local packages or modules. Its primary function is to designate a directory as a Python package, allowing its contents (other modules and sub-packages) to be imported and utilized within your project.

utils.py

• this file usually you setting up the classes for the local module / packages. This can be more different files and classes defines it. In order the class is included to the local module / package, you need to import it in the __init__.py file.

After you setup the local package / module:

my_script.py

• You can now use it in your scripts by importing the package in your python file.

One more thing:

• There's an easy way to install all the packages / modules you need all in one.
• You need to set it up by creating a requrements.txt

# What's inside of requirements.txt?
matplotlib
numpy==1.15.4
pycodestyle>=2.4.0

Note: you can just put the name of the packages / modules you want to installed, you can specified the exact version or you can just put nothing and it's all depends on your required module / package to use. After listing all the modules / packages, you can just go in terminal and type:

pip install -r requirements.txt

Warning: make sure that your terminal is located where the requirements.txt is.

Basic Python Package / Local Module Structure

my_directory/
├── my_package/
│   ├── __init__.py
│   └── utils.py
│ 
├── __init__.py
├── my_script.py