Fraction module in Python

This module provides support for rational number arithmetic. It allows to create a Fraction instance from integers, floats, numbers, decimals and strings. Fraction Instances : A Fraction instance can be constructed from a pair of integers, from another rational number, or from a string. Fraction instances are hashable, and should be treated as immutable.

1. class fractions.Fraction(numerator=0, denominator=1) : This requires that numerator and denominator are instances of numbers. Rational and a fraction instance with value = (numerator/denominator) is returned. A zerodivision error is raised if denominator = 0. 

Python3

from fractions import Fraction

print (Fraction(11, 35))
# returns Fraction(11, 35)

print (Fraction(10, 18))
# returns Fraction(5, 9)

print (Fraction())
# returns Fraction(0, 1)

1. Output : 

11/35
5/9
0

1. class fractions.Fraction(other_fraction) : This requires that other_fraction is instance of numbers.Rational and a fraction instance with same value is returned.
2. class fractions.Fraction(float) : This requires the float instance and a fraction instance with same value is returned. 

Python3

from fractions import Fraction

print (Fraction(1.13))
# returns Fraction(1272266894732165, 1125899906842624)

1. Output : 

1272266894732165/1125899906842624

1. class fractions.Fraction(decimal) : This requires the decimal instance and a fraction instance with same value is returned. 

Python

from fractions import Fraction

print (Fraction('1.13'))
# returns Fraction(113, 100)

1. Output : 

113/100

1. class fractions.Fraction(string) : This requires the string or unicode instance  and a fraction instance with same value is returned. Form for this instance : [sign] numerator [‘/’ denominator] Here, sign represents ‘+’ or ‘-’ and numerator and denominator are strings of single digits. 

Python3

from fractions import Fraction

print (Fraction('8/25'))
# returns Fraction(8, 25)

print (Fraction('1.13'))
# returns Fraction(113, 100)

print (Fraction('3/7'))
# returns Fraction(3, 7)

print (Fraction('1.414213 \t\n'))
# returns Fraction(1414213, 1000000)

1. Output : 

8/25
113/100
3/7
1414213/1000000

1. limit_denominator(max_denominator=1000000) : 
   • This method is useful for finding rational approximations to a given floating-point number.
   • This module finds and returns the closest Fraction to self that has denominator at most max_denominator.
   • This module can also be used to return the numerator of a given fraction in the lowest term by using the numerator property and the denominator by using the denominator property.

Performing Mathematical operations on fractions

Python

from fractions import Fraction

print (Fraction(113, 100) + Fraction(25, 18))
# returns Fraction(2267, 900)

print (Fraction(18, 5) / Fraction(18, 10))
# returns Fraction(2, 1)

print (Fraction(18, 5) * Fraction(16, 19))
# returns Fraction(288, 95)

print (Fraction(18, 5) * Fraction(15, 36))
# returns Fraction(3, 2)

print (Fraction(12, 5) ** Fraction(12, 10))
# returns 2.8592589556010197

Output : 

2267/900
2
288/95
3/2
2.8592589556

Fraction-based calculations using various functions of math module

Python3

import math
from fractions import Fraction

print (math.sqrt(Fraction(25, 4)))
# returns 2.5

print (math.sqrt(Fraction(28,3)))
# returns 3.0550504633038935

print (math.floor(Fraction(3558, 1213)))
# returns 2

print (Fraction(math.sin(math.pi/3)))
# returns Fraction(3900231685776981, 4503599627370496)

print (Fraction(math.sin(math.pi/3)).limit_denominator(10))
# returns Fraction(6, 7)

Output : 

2.5
3.0550504633
2.0
3900231685776981/4503599627370496
6/7

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