whole number and fraction

[Skaperen]

i want to get the whole value and fraction value of a float value i have. i converted it to string, split that by '.' (maybe it needs to be ','), then converted to ints. is there a better way? getting the whole value looks easy. is there a better way to get the fractional part?

[ichabod801]

There is a fractions module. fractions.Fraction() can take a float when initialized.

[Skaperen]

so fractions.Fraction(1.5) will give me 0.5?

[farhan275]

just use float() function if you want to get whole or fraction value as a float. For better understand see the example

# for integers
print(float(10))
# for fraction 
print(float(11.22))

[ichabod801]

so fractions.Fraction(1.5) will give me 0.5?

No. But it's not hard to get there from fractions.Franction(1.5).

[samsonite]

so fractions.Fraction(1.5) will give me 0.5?

Be careful, 1.5 is a string, so it should be defined appropriately, as follows. Cheers

# ----- frac.py ---------
from fractions import Fraction
print (Fraction('1.5'))
# ------ OUTPUT ---------
# C:\Training>python frac.py
# 3/2
# -----------------------

[ichabod801]

As it turns out, 1.5 does not have to be defined as a string:

>>> import fractions
>>> x = fractions.Fraction(1.5)
>>> x
Fraction(3, 2)
>>> print(x)
3/2
>>> y = fractions.Fraction(x.numerator % x.denominator, x.denominator)
>>> print(y)
1/2

[samsonite]

As it turns out, 1.5 does not have to be defined as a string:

It depends on your targets, mine are:

# ----- frac2.py ---------
from fractions import Fraction
print (Fraction('1.5'))
print (Fraction('3.14159265358979323846'))   
print (Fraction('3.14159265358979323846').limit_denominator(10000))   
print (Fraction('3.14159265358979323846').limit_denominator(100))   
print (Fraction('3.14159265358979323846').limit_denominator(10))   
print (Fraction(125, 50).numerator)    
print (Fraction(125, 50).denominator) 
#-------- OUTPUT ---------------
# C:\Training>python frac2.py
# 3/2
# 157079632679489661923/50000000000000000000
# 355/113
# 311/99
# 22/7
# 5
# 2
#--------------------------------

[casevh]

What about divmod()?

>>> a=1.5
>>> divmod(a,1)
(1.0, 0.5)
>>> a=3.14159
>>> divmod(a,1)
(3.0, 0.14158999999999988)

[Skaperen]

getting 1.5 from a string is just one way to do it. i could get 1.5 from 3.0/2.0 in python2 or python3 and get 1.5 from 3/2 in python3. there are other ways as well. getting 1 is as simple as int(1.5). getting 0.5 might work by doing 1.5-int(1.5). it did work in one test. i don't know if it will in all cases. maybe 1.5-float(int(1.5)) ensures that it always will.