Q1. Implement a function getCustomerList that takes as argument filename to read the file and return it as a nested list, where each element is a list of [, , ]. The filename argument doesnt contain the extension (i.e. input), your program must automatically add the .txt extension. If the file doesnt exist, the getCustomerList function will print the message: Error! not found., and should return None.

SOLVE IN PYTHON