On Wed, Mar 3, 2010 at 6:45 PM, Wells <thewellsoli...@gmail.com> wrote:
> This seems sort of odd to me: > > >>> a = 1 > >>> a += 1.202 > >>> a > 2.202 > > Indicates that 'a' was an int that was implicitly casted to a float. > But: > > >>> a = 1 > >>> b = 3 > >>> a / b > 0 > > This does not implicitly do the casting, it treats 'a' and 'b' as > integers, and the result as well. Changing 'b' to 3.0 will yield a > float as a result (0.33333333333333331) > > Is there some way to explain the consistency here? Does python > implicitly change the casting when you add variables of a different > numeric type? > > Anyway, just curiosity more than anything else. Thanks! > -- > Python doesn't cast anything. Variable names in python do not have types. It's the objects bound to the names that have types. a += 1.202 does not change a in place. It is exactly the same thing as writing a = a + 1.202 In Python (like many other languages), int + float returns a float. That float is then assigned to the name "a". In Python 2, all operations with two int operands return an int, including division. This was changed in Python 3 so that 1 / 3 will return a float and 1 // 3 will do integer division. > http://mail.python.org/mailman/listinfo/python-list >
-- http://mail.python.org/mailman/listinfo/python-list
