prize17-10, Exercise 2: Titles from 1920 to 1939

plan = [(1917, "Livery Stable Blues"), (1923, "Dippermouth Blues"), (1928, "West End Blues"),
        (1937, "One O'Clock Jump"), (1945, "Ko-Ko"), (1959, "So What"),
        (1964, "A Love Supreme"), (1973, "Chameleon")]
print([t for y, t in plan if 1920 <= y < 1940])

Output (run and checked):

['Dippermouth Blues', 'West End Blues', "One O'Clock Jump"]

Why it works: the list comprehension unpacks each pair into a year and a title, and keeps the title only when the year is in the range. The chained comparison 1920 <= y < 1940 includes 1920 and excludes 1940.

Care: the upper limit is exclusive. Use 1940 as the bound to include 1939 and nothing later.