How to know Python built-in in function??

In any case: help(x) x is a function you want to ask about. For example: help(print) displays all information about the print() function.

Built in functions. Just click on the function you want to learn more about. https://docs.python.org/3/library/functions.html Info on string: https://docs.python.org/3.6/library/string.html

A little more detail on your question please?

how to know all functions like max,min,upper how to know

thanks♥