chore: create new project structure and aoc.py runner script

adventofcode/2019/day1/day1.py

@@ -0,0 +1,44 @@
+#! /usr/bin/env python3
+
+
+def calculate_fuel_iterative(mass):
+    total = 0
+    new_mass = mass
+    while True:
+        new_mass = new_mass // 3 - 2
+        if new_mass < 0:
+            break
+        total += new_mass
+    return total
+
+
+def calculate_total_fuel_mass(input_file, mass_function=lambda x: x // 3 - 2):
+    total = 0
+    with open(input_file) as masses:
+        for mass in masses:
+            total += mass_function(int(mass))
+    return total
+
+
+def test_part2():
+    inputs = (14, 1969, 100756)
+    expected = (2, 966, 50346)
+    for i, inp in enumerate(inputs):
+        result = calculate_fuel_iterative(inp)
+        assert result == expected[i], "Result for {} should be {}, was {}".format(
+            inp, expected[i], result
+        )
+    print("All tests passed for part 2.")
+
+
+if __name__ == "__main__":
+    import sys
+    infile = sys.argv[1] if len(sys.argv) > 1 else "example.txt"
+
+    print("Part 1 - total mass: ", calculate_total_fuel_mass(infile))
+
+    test_part2()
+    print(
+        "Part 2 -- total mass: ",
+        calculate_total_fuel_mass(infile, calculate_fuel_iterative),
+    )