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Python | Decimal from_float() method

  • Last Updated : 23 May, 2022

Decimal#from_float() : from_float() is a Decimal class method which converts  a float to a decimal number, exactly.

Syntax: Decimal.from_float() Parameter: Decimal values Return: converts  a float to a decimal number, exactly.

Code #1 : Example for from_float() method 

Python3




# Python Program explaining
# from_float() method
 
# loading decimal library
from decimal import *
 
 
# Initializing a decimal value
a = Decimal(-1)
 
b = Decimal('0.142857')
 
# printing Decimal values
print ("Decimal value a : ", a)
print ("Decimal value b : ", b)
 
 
# Using Decimal.from_float() method
print ("\n\nDecimal a with from_float() method : ", a.from_float(0.1))
 
print ("Decimal b with from_float() method : ", b.from_float(float('nan')))

Output :

Decimal value a :  -1
Decimal value b :  0.142857


Decimal a with from_float() method :  0.1000000000000000055511151231257827021181583404541015625
Decimal b with from_float() method :  NaN

Code #2 : Example for from_float() method 

Python3




# Python Program explaining
# from_float() method
 
# loading decimal library
from decimal import *
 
 
# Initializing a decimal value
a = Decimal('-3.14')
 
b = Decimal('321e + 5')
 
# printing Decimal values
print ("Decimal value a : ", a)
print ("Decimal value b : ", b)
 
 
# Using Decimal.from_float() method
print ("\n\nDecimal a with from_float() method : ", a.from_float(0.02))
 
print ("Decimal b with from_float() method : ", b.from_float(float('-inf')))

Output :

Decimal value a :  -3.14
Decimal value b :  3.21E+7


Decimal a with from_float() method :  0.0200000000000000004163336342344337026588618755340576171875
Decimal b with from_float() method :  -Infinity

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