如何计算某事物在状态数组中出现的频率

def calculate_frequency(status_array):
    frequency_dict = {}
    
    for item in status_array:
        if item in frequency_dict:
            frequency_dict[item] += 1
        else:
            frequency_dict[item] = 1
    
    return frequency_dict

# 示例用法
status_array = [1, 2, 3, 2, 1, 3, 4, 2, 1]
frequency_dict = calculate_frequency(status_array)

# 输出每个事物及其对应的频率
for item, frequency in frequency_dict.items():
    print(f"事物 {item} 的频率为 {frequency}")