[Python] How to package a module in Python 3?

I am struggling to find a way to package a module in Python 3. My package is not being recognised as such, meaning the module cannot be imported.

As an example, I do the following in the same order:

1. 
   I created a package folder.
   
   
2. 
   I created the module.py scripts and the __init__.py script inside the package folder.
   
   
3. 
   I wrote the given code in the module.py file.
   
   # Module content
   def sample_method():
   return "message"
4. 
   I read the __init__.py file could be empty at first.
   
   # empty file
5. 
   I called the module from the python3 interpreter.
   
   python3
   import module as m
   print(m.method())
6. 
   It works well when I execute it from the Python interpreter at the TTY terminal. However, when I try to call the method from a python_script.py file located outside the package, no error is thrown; instead, any kind of error, instead the import statement is marked as not finding the given module.
   

Import "custom_modules" could not be resolved

How to solve this problem?

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