In Python : Given a string that has a length of 1000, write a line of code to get substring (a sequence of string) of the string.

1- Given start = 10 ,end = 80, return required string.

2- Given start = 800, extract all characters from start position to end

3- Given start = 800, end = 700, extract all characters

4- Given start = 800, step = -1, extract all characters

5- Extract substring from original one with a step of 3

6- Reverse original string

7- Get character that at position 987 of given string

8- Reverse the string, start = 72, end = 199