Its easier to import the package and use the various functionalty for manipulating the array. Can do N-dimensional array very easily.

Numpy is so essential that most third-party libraries nearly require you to use it to use their libraries. It's ingrained into the Python community and has a ton of online support. The library is easy to use and you can use the product of the API in a number of other libraries.

Allows you to scientifically compute on Python.