如何在python中舍入整数

# 舍入浮点数
num1 = 3.14159
rounded_num1 = round(num1)
print(rounded_num1)  # 输出：3

# 保留两位小数
num2 = 123.456
rounded_num2 = round(num2, 2)
print(rounded_num2)  # 输出：123.46

# 保留四位小数
num3 = 987.654321
rounded_num3 = round(num3, 4)
print(rounded_num3)  # 输出：987.6543

num4 = 2.5
rounded_num4 = round(num4)
print(rounded_num4)  # 输出：3

import math

num5 = 2.5
rounded_num5 = math.ceil(num5)
print(rounded_num5)  # 输出：3

num6 = -2.5
rounded_num6 = math.floor(num6)
print(rounded_num6)  # 输出：-3