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First solution in Clear category for Convert and Aggregate by book1978
def conv_aggr(data: list[tuple[str, int]]) -> dict[str, int]:
s = dict()
for x, y in data:
s[x] = s.setdefault(x, 0) + y
return {x: y for x, y in s.items() if x and y}
print("Example:")
print(conv_aggr([("a", 7), ("b", 8), ("a", 10)]))
# These "asserts" are used for self-checking
assert conv_aggr([("a", 7), ("b", 8), ("a", 10)]) == {"a": 17, "b": 8}
assert conv_aggr([]) == {}
assert conv_aggr([("a", 5), ("a", -5)]) == {}
assert conv_aggr([("a", 5), ("a", 5), ("a", 0)]) == {"a": 10}
assert conv_aggr([("a", 5), ("", 15)]) == {"a": 5}
print("The mission is done! Click 'Check Solution' to earn rewards!")
Dec. 13, 2022