python中round函数的用法

作者：吃斋的狼发布日期:2026-07-30 浏览:50

# 示例代码：Python中round函数的用法

# round函数用于四舍五入，可以对浮点数进行取整或保留指定的小数位数。

# 基本用法：不指定小数位数时，默认取整
num1 = 3.6
rounded_num1 = round(num1)
print(f"round({num1}) = {rounded_num1}")  # 输出: round(3.6) = 4

# 指定小数位数：保留两位小数
num2 = 3.14159
rounded_num2 = round(num2, 2)
print(f"round({num2}, 2) = {rounded_num2}")  # 输出: round(3.14159, 2) = 3.14

# 对于0.5的情况，round函数遵循“四舍六入五成双”的规则
num3 = 2.5
rounded_num3 = round(num3)
print(f"round({num3}) = {rounded_num3}")  # 输出: round(2.5) = 2

num4 = 3.5
rounded_num4 = round(num4)
print(f"round({num4}) = {rounded_num4}")  # 输出: round(3.5) = 4

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