Precision of repr(f), str(f), print(f) when f is float

If I run:

>>> import math>>> print(math.pi)3.141592653589793

Then pi is printed with 16 digits,

However, according to:

>>> import sys>>> sys.float_info.dig 15

My precision is 15 digits.

So, should I rely on the last digit of that value (i.e. that the value of π indeed is 3.141592653589793nnnnnn).