Python math function | modf()

modf() function is an inbuilt function in Python that returns the fractional and integer parts of the number in a two-item tuple. Both parts have the same sign as the number. The integer part is returned as a float.

Syntax :

modf(number)

Parameter :



There is only one mandatory parameter which is the number.

Returns :
This method returns the fractional and integer parts of number in a two-item tuple. Both parts have the same sign as the number. The integer part is returned as a float.

Exception :

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

Below is the Python3 implementation of modf() method :

Code #1

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# 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)) 

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Output :


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



 


Code #2 :  TypeError











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# 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")) 



















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Output : 


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



  

Code #3 :











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# 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])) 



















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Output :


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)



Practical Application : 

Given two float numbers, multiply the fractional part and return the answer. 


Code #4 :











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# 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]) 



















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Output :


0.05999999999999993




          
          
          
          

            

    

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