What is mean Expected indentation on python program and how can solve this problem?

Answer 1

Remember to use spaces instead tabs. ;)

Answer 2

When you use control structures or create a function, You need to put blank spaces after the level in which the block was defined. See below.

def function(arguments):
code

if condition:
code

and so on.

Answer 3

this probably means you have the indentation wrong, make sure that
- blocks are indented
- all lines within a block are indented with the same number of spaces
- do not mix tabs and spaces in your code (best is to use spaces only)