how much precise does python float code example

Example: show all digits in python

>>> a
3.101541146879488e+80
>>> int(a)
310154114687948792274813492416458874069290879741385354066259033875756607541870592L
>>> long(a)
310154114687948792274813492416458874069290879741385354066259033875756607541870592L
>>> print (int(a))
310154114687948792274813492416458874069290879741385354066259033875756607541870592
>>> print (long(a))
310154114687948792274813492416458874069290879741385354066259033875756607541870592