Today we will be building a custom iterator. We are going to create a program for searching football(soccer) statistics from within a CSV(comma separated values) file. We will be using Python's builtin CSV module for handling file processing duties, documentation available here: https://docs.python.org/3/library/csv.html Note: There is an example for basic csv reading listed under the reader method.

Your code will reside in the #explorer.py file, the models.py file is provided for you and does not need to be altered.

The public interface to your program will be the FootballExplorer class. The __init__ for this class takes a single parameter, the filename for the csv file to read. The class should also have two methods as part of its public interface: all and search

all takes no parameters and should return an iterator that contains all the records from the csv file as Player objects.

search four optional parameters: country, year, age, and position If none of these parameters are given it should raise a ValueError. The search method should return an iterator that contains all the records from the csv file that match the given parameters as Player objects.

It may make things easier to create a base iterator class for returning all records and then have a child class inherit from that for handling filtering search results.