You simply do so because that makes it easier to understand the programming logic when you come back to the code later. In contrast, you need to indent Python statements properly, or your program ...

Python syntax uses color-coded highlighting and indent style to help programmers ... meaning specific programming tasks may be more challenging to accomplish. MicroPython also requires spaces ...

Because indentation matters in Python ... you can do a lot more with python-ldap. You can find more python-ldap programming examples here.