# Python | frexp() Function

• Last Updated : 21 Sep, 2018

`frexp()` function is one of the Standard math Library function in Python.

It returns mantissa and exponent as a pair (m, e) of a given value x, where mantissa m is a floating point number and e exponent is an integer value. m is a float and e is an integer such that x == m * 2**e exactly.

If x is zero, returns (0.0, 0), otherwise 0.5 <= abs(m) < 1. This is used to “pick apart” the internal representation of a float in a portable way.

Syntax: math.frexp( x )

Parameters: Any valid number (positive or negative).

Returns: Returns mantissa and exponent as a pair (m, e) value of a given number x.

Exception: If x is not a number, function will return TypeError.

Code #1:

 `# Python3 code demonstrate frexp() function`` ` `# importing math library``import` `math`` ` ` ` `# calculating mantissa and``# exponent of given integer``print``(math.frexp(``3``))``print``(math.frexp(``15.7``))``print``(math.frexp(``-``15``))`

Output:

```(0.75, 2)
(0.98125, 4)
(-0.9375, 4)
```

Code #2:

 `# Python3 code demonstrate frexp() function`` ` `# importing math library``import` `math`` ` `# creating a list``lst ``=` `[``15``, ``13.76``, ``17.5``, ``21``]`` ` `# creating a tuple``tpl ``=` `(``-``15.85``, ``-``41.24``, ``-``11.2``, ``54``)`` ` `# calculating mantissa and exponent``# of 1st, 3rd elements in list ``print``(math.frexp(lst[``0``]))``print``(math.frexp(lst[``2``]))`` ` `# calculating mantissa and exponent``# of 2nd, 3rd and 4th elements in tuple ``print``(math.frexp(tpl[``1``]))``print``(math.frexp(tpl[``2``]))``print``(math.frexp(tpl[``3``]))`

Output:

```(0.9375, 4)
(0.546875, 5)
(-0.644375, 6)
(-0.7, 4)
(0.84375, 6)```

Code #3: If the x parameter is not a number, `frexp()` function will return a TypeError.

 `# Python3 code demonstrates when error occurs``import` `math`` ` `print``(math.frexp(``'25'``)) `

Output:

`TypeError: a float is required`

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