https://www.python.org/downloads/

check the system type of yours.
The latest series will not work on win 7 or earlier

*IDLE, an integrated development environment (IDE) for Python, to write and execute Python scripts. *

*Choose File --> New File *

Type the code & Save the file

Same above can be achieved in as below as well

Using Collab (alternate way)
https://colab.research.google.com/