important.py

processes = 20    # using 20 processes since I'm running this on my server
with Pool(processes) as p:  # create the pool 
    print(f"Determining square values.")
    # spawn the processes for each Latin square (lines is a list of strings representing the squares)
    results = p.map(get_value, lines)   
    print(f"Aggregating results.")
    # determine how to split up the resulting (square, value) pairs [i.e. how many per process]
    values_per_list = int(len(results)/processes)
    extra = len(results) - (values_per_list*processes)
    result_lists = []
    # break the list up into smaller lists for each process
    for i in range(processes-1):
        result_lists.append(results[(values_per_list*i):(values_per_list*(i+1))])
    # give the last process all of the remaining squares
    result_lists.append(results[(processes-1)*values_per_list:])

    # get all of the dictionaries returned by the build_dict function, this will be a list of dictionaries
    union_dicts = p.map(build_dict, result_lists)
    # combine each dictionary into one dictionary, namely 'totals'
    for d in union_dicts:
        totals = {**totals, **d}