f-string basics: table formatting

# f-strings new in 3.6 and 3.7+

# f-string tutorial code for video: https://youtu.be/c46t7eIldaI

# multiple columns how do you align decimals (zeros should fill in)
# using field width to align columns of numbers
values = [1, 3, 5, 7, 10, 21]

# table of float(v1/v2) for all combinations

print(f'{"n/d":>8s}', end='')  # print string in "" with right aling code >8s
for denominator in values:  # print headings for columns
    print(f'{denominator:8d}', end='')
print()

for numerator in values:  # for each row
    print(f'{numerator:8d}', end='')
    for denominator in values:  # print n/d for each column
        x = numerator / denominator
        print(f'{x:8.4f}', end='')
    print()