年回报转换函数返回复数值

def annual_return(initial_value, final_value, years):
    if initial_value <= 0 or final_value < 0 or years <= 0:
        raise ValueError("输入参数必须为正数且年数不能为零")
    
    try:
        return (final_value / initial_value) ** (1 / years) - 1
    except ZeroDivisionError:
        raise ValueError("年数不能为零")

# 示例
initial_value = 10000
final_value = 15000
years = 5

try:
    result = annual_return(initial_value, final_value, years)
    print(f"年回报率：{result:.2%}")
except ValueError as e:
    print(e)