# 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

 `# 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``))  `

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

 `# 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"``)) `

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 :

 `# 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``])) `

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 :

 `# 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``]) `

Output :

```0.05999999999999993
```

My Personal Notes arrow_drop_up

Striver(underscore)79 at Codechef and codeforces D

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