3 (jupiter)

 def mapper(line):

    parts = line.strip().split(',')

    return parts if len(parts) == 2 else None

def reducer(conditions):

    return max(set(conditions), key=conditions.count)

def main(file):

    with open(file, encoding='utf-8') as f:

        data = [mapper(line) for line in f if mapper(line)]

    grouped = {}

    for date, cond in data:

        grouped.setdefault(date, []).append(cond)

    for date in grouped:

        print(f"Weather on {date}: {reducer(grouped[date])}")

# Example usage

if __name__ == "__main__":

    main('weather.txt')

..................................................................................

def mapper(l): return tuple(l.strip().split(','))
def reducer(c): return max(set(c), key=c.count)
def main(data):
    g = {}
    for d, c in map(mapper, data): g.setdefault(d, []).append(c)
    for d in g: print(f"Weather on {d}: {reducer(g[d])}")
if __name__ == "__main__":
    lines = [
        "2023-01-01,Sunny",
        "2023-01-01,Rainy",
        "2023-01-01,Sunny",
        "2023-01-02,Cloudy",
        "2023-01-02,Cloudy",
        "2023-01-02,Rainy"
    ]
    main(lines)

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