how can I count special characters in a string in few steps

Answer 1

Using regular expression in python u can do easily , you can include/exclude no.,alphabets or special symbols
and for count u can use loop or store in some other mutable data type and measure length.

Answer 2

https://code.sololearn.com/cT33B9WS4Z08/?ref=app

Answer 3

use ASCII codes
ASCII Code Table
http://www.asciitable.com/