as shown below for some reason 15.06 + 5 results in an addition of 0.0000002 and i want to know why its an bug or something im doing wrong but below it i tried it with 15.07 it works

because you have the round with the float type. 

you could use the decimal module with Decimal

In [1]: import decimal

In [2]: decimal.Decimal('15.06') + 5
Out[2]: Decimal('20.06')

and you can read this link where we explain the limits of the float type:
https://docs.python.org/3/tutorial/floatingpoint.html

Thanks for the report but I think is a known limitation with floating points and this page explains it well : https://docs.python.org/3.7/tutorial/floatingpoint.html . Using round will be helpful in your situation to round the output to 2 decimal places. I think the issue is also not predictable and a below example on Python 3 is similar to your case. I think this is not a bug in Python but a known behavior that is also present in a lot of other languages.

>>> 0.1+0.2
0.30000000000000004
>>> 0.2+0.2
0.4
>>> 0.2+0.3
0.5
>>> 0.2+0.4
0.6000000000000001
>>>

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