hello world, this is Python
Multi-line         string
Multi-line
          string
capitalize first letter Hello world, this is python
length of the string... 27
center the string......            hello world, this is Python            
left adjust............ hello world, this is Python                       
right adjust...........                        hello world, this is Python
how many "h"........... 3
does string end "on"?.. True
find "this"............ 13
find "that" from 5-20.. -1
take a substring 0-10.. hello world
convert to lower case.. hello world, this is python
convert to upper case.. HELLO WORLD, THIS IS PYTHON
strip lead/end spaces.. hello world, this is Python
replace this with that  hello world, that is Python
replace "h" with "H"... Hello world, tHis is PytHon
replace 1 occur of "h"  Hello world, this is Python
split a string into list ['hello', 'world,', 'this', 'is', 'Python']
split using a comma ","  ['hello world', ' this is Python']
split str1 on every char  ['h', 'e', 'l', 'l', 'o', ' ', 'w', 'o', 'r', 'l', 'd', ',', ' ', 't', 'h', 'i', 's', ' ', 'i', 's', ' ', 'P', 'y', 't', 'h', 'o', 'n']
join list into a string  h-e-l-l-o- -w-o-r-l-d-,- -t-h-i-s- -i-s- -P-y-t-h-o-n
['Hello ', ' World']
['Hello ', ' World']
['Hello ', ' World']