38 lines
682 B
Python
38 lines
682 B
Python
|
#!/usr/bin/env python
|
||
|
|
# -*- encoding: utf-8 -*-
|
||
|
|
"""
|
||
|
|
Topic: 四舍五入运算
|
||
|
|
Desc :
|
||
|
|
"""
|
||
|
|
|
||
|
|
|
||
|
|
def round_num():
|
||
|
|
print(round(1.23, 1))
|
||
|
|
print(round(1.27, 1))
|
||
|
|
print(round(-1.27, 1))
|
||
|
|
print(round(1.25361,3))
|
||
|
|
|
||
|
|
# 舍入数为负数
|
||
|
|
a = 1627731
|
||
|
|
print(round(a, -1))
|
||
|
|
print(round(a, -2))
|
||
|
|
print(round(a, -3))
|
||
|
|
|
||
|
|
# 格式化输出
|
||
|
|
x = 1.23456
|
||
|
|
print(format(x, '0.2f'))
|
||
|
|
print(format(x, '0.3f'))
|
||
|
|
print('value is {:0.3f}'.format(x))
|
||
|
|
|
||
|
|
# 不要自以为是的用round去修正一些精度问题
|
||
|
|
a = 2.1
|
||
|
|
b = 4.2
|
||
|
|
c = a + b
|
||
|
|
print(c)
|
||
|
|
c = round(c, 2) # "Fix" result (???)
|
||
|
|
print(c)
|
||
|
|
|
||
|
|
if __name__ == '__main__':
|
||
|
|
round_num()
|
||
|
|
|