'''
    Honors Series - Data Science
    Fall 2020
    List Examples
'''

def main():
    # Example 1 -- Create a list and print each element one at a time
    lst = ['a', 'b', 'c', 'd', 'e', 'f']
    for item in lst:
        print(item)

    # Example 2 -- Create a list and add together two of its values
    lst = [2.5, 4.87, 6.0, 8.2]
    num = lst[0] + lst[1]
    print(num)

    # Example 3 -- Create a list, and sum together all its values
    lst = [1, 4, 9, 16, 25]
    total = sum(lst)
    print('Total of everything in the list is:', total)

    # Example 4 -- Create an empty list, and add elements to it one at a time
    lst = []
    for i in range(5):
        num = float(input('Enter a number.\n'))
        lst.append(num)
    print('Your list is', lst)

    # Example 5 -- Create a nested list and print ONE value at a time
    nested = [['a', 12, 1980], ['b', 13, 1981]]
    print('Nested[0][0]...', nested[0][0])
    print('Nested[0][1]...', nested[0][1])
    print('Nested[1][2]...', nested[1][2])

    # Example 6 -- Create a nested list and turn one column into 
    # a list of its own
    nested = [['a', 12, 1980], ['b', 13, 1981]]
    years = []
    for row in nested:
        years.append(row[2])
    print(years)
        
main()