To define a module, type some Python code into a text file, and save it with a ".py" extension.
Such file is automatically considered a Python module.
All the names assigned at the top level of the module become its attributes.
During import they are exported for clients to use.
Type the following def into a file called module1.py.
Here, you create a module object with one attribute: the name printer, which happens to be a reference to a function object:
def printer(x): # Module attribute print(x)