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) 

Time Complexity: O(1)

Auxiliary Space: O(1)

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 than a float number is passed, it returns a type error. 

Below is the Python3 implementation of modf() method : Code #1 

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 

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 : 

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 : 

Output :

0.05999999999999993