prize17-3, Exercise 3: Years since 1917

events = {"Original Dixieland Jass Band record": 1917,
          "Creole Jazz Band at Gennett": 1923,
          "Hot Five begins": 1925,
          "West End Blues": 1928}
base = 1917
for name, year in events.items():
    print(f"{year}  +{year - base:>2} years  {name}")

Output (run and checked):

1917  + 0 years  Original Dixieland Jass Band record
1923  + 6 years  Creole Jazz Band at Gennett
1925  + 8 years  Hot Five begins
1928  +11 years  West End Blues

Why it works: a dictionary pairs each name with a year, and the loop subtracts the base year. The :>2 in the f-string right-aligns the number in two characters so the columns line up.

Care: the years are those given in this chapter; the first Hot Five sessions are usually dated to 1925 (check).