Functional programming tends to be declarative rather than imperative. The code expresses the result you want, rather than describing in detail how to obtain that result.

For certain applications, that can make the code a lot simpler, which in turn can make it less error prone and sometimes more efficient too.

But is isn't a magic bullet. Some applications are better suited to procedural code. FP is a useful tool that Python allows you to use as and when it makes sense.