当前位置: 首页>>代码示例 >>用法及示例精选 >>正文


Python math modf()用法及代码示例


modf()函数是Python中的内置函数,它返回two-item元组中数字的小数和整数部分。两个部分的符号与数字相同。整数部分以浮点数形式返回。

用法:

modf(number) 

参数:


There is only one mandatory parameter which is the number. 

返回值:
此方法返回two-item元组中数字的小数和整数部分。两个部分的符号与数字相同。整数部分以浮点数形式返回。

异常:

TypeError: If anything other then a float number is passed, it returns a type error. 

下面是modf()方法的Python3实现:

代码#1

# Python3 program to demonstrate the function modf() 
  
# This will import math module 
import math    
  
# modf() function used with a positive number 
print("math.modf(100.12):", math.modf(100.12)) 
  
# modf() function used with a negative number 
print("math.modf(-100.72):", math.modf(-100.72))  
  
print("math.modf(2):", math.modf(2)) 

输出:

math.modf(100.12): (0.12000000000000455, 100.0)
math.modf(-100.72): (-0.7199999999999989, -100.0)
math.modf(2): (0.0, 2.0)

代码2:TypeError

# Python3 program to demonstrate the   
# error in function modf() 
  
# This will import math module 
import math    
  
# modf() function used with a positive number 
print("math.modf(100.12):", math.modf("100.12"))

输出:

Traceback (most recent call last):
  File "/home/fa6d7643de17bafe9a0e0693458e4bdb.py", line 9, in 
    print("math.modf(100.12):", math.modf("100.12"))
TypeError:a float is required


代码#3

# Python3 program to demonstrate the  
# error in function modf() 
  
# This will import math module 
from math import modf 
  
lst = [3.12, -5.14, 13.25, -5.21] 
tpl = (33.12, -15.25, 3.15, -31.2) 
  
  
# modf() function on elements of list 
print("modf() on First list element:", modf(lst[0])) 
print("modf() on third list element:", modf(lst[2])) 
  
# modf() function on elements of tuple 
print("modf() on Second tuple element:", modf(tpl[1])) 
print("modf() on Fourth tuple element:", modf(tpl[3]))

输出:

modf() on First list element: (0.1200000000000001, 3.0)
modf() on third list element: (0.25, 13.0)
modf() on Second tuple element: (-0.25, -15.0)
modf() on Fourth tuple element: (-0.1999999999999993, -31.0)

实际应用:
给定两个浮点数,将小数部分相乘并返回答案。

代码4:

# Python3 program to demonstrate the  
# application of function modf() 
  
# This will import math module 
import math    
  
# modf() function to multiply fractional part  
a = math.modf(11.2)  
b = math.modf(12.3) 
  
# Multiply the fractional part as is stored   
# in 0th index of both the tuple 
print(a[0]*b[0])

输出:

0.05999999999999993


相关用法


注:本文由纯净天空筛选整理自Striver大神的英文原创作品 Python math function | modf()。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。