python数学模块中的log2

import math

# 计算以2为底的对数
result = math.log2(8)
print(result)  # 输出: 3.0

# 计算负数的对数（会引发ValueError）
try:
    result = math.log2(-1)
except ValueError as e:
    print(e)  # 输出: math domain error

import math

def safe_log2(x):
    if x <= 0:
        raise ValueError("输入值必须为正数")
    return math.log2(x)

try:
    result = safe_log2(-1)
except ValueError as e:
    print(e)  # 输出: 输入值必须为正数

import math

def safe_log2(x):
    if x <= 0:
        raise ValueError("输入值必须大于0")
    return math.log2(x)

try:
    result = safe_log2(0)
except ValueError as e:
    print(e)  # 输出: 输入值必须大于0