main script

import Population_Data   # A module we wrote

# The first year in the population data
YEAR_1 = 1950

# Open the file
file_obj = open('USPopulation.txt', 'r')

# This statement creates a list with all the lines in the file where the
# entries are strings.
population_list = file_obj.read().splitlines()
# So we convert the strings to integers, one-by-one.
for i in range(len(population_list)):
    population_list[i] = int(population_list[i])

Population_Data.display_population_data(population_list, YEAR_1)

# Close the file
file_obj.close()