How do I know if my answer is the shortest solution?

When typing up a code on Python, how do I know my idea is the shortest or simplest way to getting the job done?
Can Python check that out for me? Or is it based entirely on my own knowledge?
Thanks in advance for answering!

Python will not check our code to see if it can be improved or simplified. Only we can do that. Best way would be to write several versions that solve the same problem and compare their complexity, speed and efficiency, readability, etc.