Syntax in Python - Python Tutorial - w3Schools - Ch#03 English

Python syntax can be executed by writing directly in the Command Line. Or by creating a python file on the server, using the .py file extension, and running it in the Command Line.
Indentation refers to the spaces at the beginning of a code line.
Where in other programming languages the indentation in code is for readability only, the indentation in Python is very important.
Python uses indentation to indicate a block of code.