hi, i am interested how is possible to work with python from dos and if somebody have some simple example.

I myself have not used DOS for a long while, as now everything runs in Windows or Linux. I did find that old 2.4 version exist: www.caddit.net/pythond/

You would run an existing python program file from DOS. The file would be created using a text editor, just like any other text file. You can not use IDLE, which comes with Python, since is requires a GUI. Some useful info.

if somebody have some simple example

See this page on the python.org website.

There are many years since DOS was a part of windows.
No there is cmd(command line),but that is not DOS.
They only way run DOS these day,is to run it as an own OS.