统计每行中第一个列值分别出现的次数

def count_first_column_occurrences(data):
    occurrences = {}
    for row in data:
        first_column_value = row[0]
        if first_column_value in occurrences:
            occurrences[first_column_value] += 1
        else:
            occurrences[first_column_value] = 1
    return occurrences

# 示例数据
data = [
    ['A', 'B', 'C'],
    ['A', 'D', 'E'],
    ['B', 'F', 'G'],
    ['C', 'H', 'I'],
    ['A', 'J', 'K'],
    ['B', 'L', 'M'],
    ['C', 'N', 'O'],
]

result = count_first_column_occurrences(data)
print(result)

{'A': 3, 'B': 2, 'C': 2}