python slice operator
string = 'string_text'
beginning = 0 # at what index the slice should start.
end = len(string) # at what index the slice should end.
step = 1 # how many characters the slice should go forward after each letter
new_string = string[beginning:end:step]
# some examples
a = 0
b = 3
c = 1
new_string = string[a:b:c] # will give you: str
# ____________________________________________
a = 2
b = len(string) - 2
c = 1
new_string = string[a:b:c] # will give you: ring_te