I'm trying to create a small app for calculation of expenses. It already works with float, but I suppose that using decimals can make code more clear and simple. Just a small example to show the issue that I have:
import decimal
decimal.getcontext().prec = 2
print ("{}".format(decimal.Decimal(1)/decimal.Decimal(3)))
the output is 0.33 and 2 digits is what I need.
Let's increase the first number from 1 up to 10:
import decimal
decimal.getcontext().prec = 2
print ("{}".format(decimal.Decimal(10)/decimal.Decimal(3)))
the output is 3.3 and it is not that kind of representation that I need. I still would like to have two digits after delimiter: 3.33 instead of 3.3. I have tried different ways like using localcontext, but haven't succeed:
from decimal import Context, localcontext, Decimal
with localcontext(Context(2)):
print((Decimal("10") / 3))
So, as I can see decimal.getcontext().prec defines the number of digits after delimiter if the variable < 1 or defines the total number of digits if the variable > 0. I'm wondering does some simple solution always keep 2 digits after delimiter exists? This case seems quite common and I believe that there should be a simple and elegant solution which was found before me.
Update: It seems that description wasn't clear enough, therefore, my question was linked to another one. Let's try to clarify :) I'm looking for a way to define data format once at the beginning and keep it after instead of using quantize() each time when I do division or multiplication operations. quantize() solves issue only for one variable and this variable shouldn't be changed after that. For instance, if I have 10 operations then I should use quantize() 10 times that doesn't seem effective and in such case, I don't see significant reasons to change code and use decimals instead of float.
