how to sense if typed characters in python code example

Example 1: can you look for specific characters in python

yourString = "string"

if "s" in yourString:
  print("There is an S in your string")
  
if "s" not in yourString:
  print("There is no S in your string")

Example 2: how to search for a specific character in a part of a python string

myString = "God is good"

if "o" in myString[0:4]
	print("Working! There is an 'O' in between the G and D of God.")