Python数学函数|修改()
modf()函数是Python中的一个内置函数,它返回一个二元组中数字的小数部分和整数部分。两个部分的符号与数字相同。整数部分作为浮点数返回。
句法 :
modf(number)
范围 :
There is only one mandatory parameter which is the number.
返回:
此方法以两项元组返回 number 的小数部分和整数部分。两个部分的符号与数字相同。整数部分作为浮点数返回。
例外 :
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:类型错误
# 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,乘以小数部分并返回答案。
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