The difference between two functions

[midarq]

Yes. You can always use the type function to test that.
Examples (Out[10] is the output for the line of code above it):

from decimal import Decimal

2/5
Out[10]: 0.4

type(2/5)
Out[11]: float

Decimal(2/5)
Out[12]: Decimal('0.40000000000000002220446049250313080847263336181640625')

type(Decimal(2/5))
Out[13]: decimal.Decimal

2//5
Out[14]: 0

type(2//5)
Out[15]: int