Python | frexp() Function

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:

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# 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))

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Output:


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



 


Code #2:  











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# 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])) 



















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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.











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# Python3 code demonstrates when error occurs 


import math 


  


print(math.frexp('25'))  



















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Output:


TypeError: a float is required



          
          
          
          

            

    

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