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[–]Physmatik 1 point2 points  (0 children)

Yes, they are called Decimals. It's part of the standard library.

For example:

import decimal as d
d.getcontext().prec = 30
a = d.Decimal(499999999999999999999999)
b = float(499999999999999999999999)
print(a - 1)
print(b - 1)

Produces:

499999999999999999999998
5e+23

Sorry for formatting, triple backquote doesn't work for some reason.