How do I get a decimal value when using the division operator in Python?
For example, the standard division symbol '/' rounds to zero:
>>> 4 / 100
0
However, I want it to return 0.04. What do I use?
Asked by: Darcy692 | Posted: 27-01-2022
Answer 1
There are three options:
>>> 4 / float(100)
0.04
>>> 4 / 100.0
0.04
which is the same behavior as the C, C++, Java etc, or
>>> from __future__ import division
>>> 4 / 100
0.04
You can also activate this behavior by passing the argument -Qnew to the Python interpreter:
$ python -Qnew
>>> 4 / 100
0.04
The second option will be the default in Python 3.0. If you want to have the old integer division, you have to use the // operator.
Edit: added section about -Qnew, thanks to ΤΖΩΤΖΙΟΥ!
Answer 2
Other answers suggest how to get a floating-point value. While this wlil be close to what you want, it won't be exact:
>>> 0.4/100.
0.0040000000000000001
If you actually want a decimal value, do this:
>>> import decimal
>>> decimal.Decimal('4') / decimal.Decimal('100')
Decimal("0.04")
That will give you an object that properly knows that 4 / 100 in base 10 is "0.04". Floating-point numbers are actually in base 2, i.e. binary, not decimal.
Answered by: Brianna206 | Posted: 28-02-2022Answer 3
Make one or both of the terms a floating point number, like so:
4.0/100.0
Alternatively, turn on the feature that will be default in Python 3.0, 'true division', that does what you want. At the top of your module or script, do:
from __future__ import division
Answer 4
You might want to look at Python's decimal package, also. This will provide nice decimal results.
>>> decimal.Decimal('4')/100
Decimal("0.04")
Answer 5
You need to tell Python to use floating point values, not integers. You can do that simply by using a decimal point yourself in the inputs:
>>> 4/100.0
0.040000000000000001
Answer 6
A simple route 4 / 100.0
or
4.0 / 100
Answered by: Anna637 | Posted: 28-02-2022Answer 7
Here we have two possible cases given below
from __future__ import division
print(4/100)
print(4//100)
Answer 8
Try 4.0/100
Answered by: Walter352 | Posted: 28-02-2022Answer 9
You cant get a decimal value by dividing one integer with another, you'll allways get an integer that way (result truncated to integer). You need at least one value to be a decimal number.
Answered by: Ada110 | Posted: 28-02-2022Answer 10
Add the following function in your code with its callback.
# Starting of the function
def divide(number_one, number_two, decimal_place = 4):
quotient = number_one/number_two
remainder = number_one % number_two
if remainder != 0:
quotient_str = str(quotient)
for loop in range(0, decimal_place):
if loop == 0:
quotient_str += "."
surplus_quotient = (remainder * 10) / number_two
quotient_str += str(surplus_quotient)
remainder = (remainder * 10) % number_two
if remainder == 0:
break
return float(quotient_str)
else:
return quotient
#Ending of the function
# Calling back the above function
# Structure : divide(<divident>, <divisor>, <decimal place(optional)>)
divide(1, 7, 10) # Output : 0.1428571428
# OR
divide(1, 7) # Output : 0.1428
This function works on the basis of "Euclid Division Algorithm". This function is very useful if you don't want to import any external header files in your project.
Syntex : divide([divident], [divisor], [decimal place(optional))
Code : divide(1, 7, 10) OR divide(1, 7)
Comment below for any queries.
Answered by: Anna164 | Posted: 28-02-2022Answer 11
You could also try adding a ".0" at the end of the number.
4.0/100.0
Answered by: Carlos200 | Posted: 28-02-2022Answer 12
It's only dropping the fractional part after decimal. Have you tried : 4.0 / 100
Answered by: Luke396 | Posted: 28-02-2022Answer 13
Import division from future library like this:
from__future__ import division
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