Floating point calculation problem
rosuav at gmail.com
Sat Feb 2 11:34:42 CET 2013
On Sat, Feb 2, 2013 at 9:27 PM, Schizoid Man <schiz_man at 21stcentury.com> wrote:
> The quantity s is input with the following line: s = input("Enter s: ")
> To get rid of the compile error, I can cast this as a float: s =
> float(input("Enter s: "))
> However, then the result returned by the method is wrong. Why does this
> error occur in version 3.3.0 but not in 2.7.3? Why is the result incorrect
> when s is cast as a float (the casting is not required in 2.7.3)? How is
> Python dynamically typed if I need to cast (in version 3.3.0 at least) to
> get rid of the compile error?
Did you use input() or raw_input() in 2.7.3? If the former, you were
actually doing this:
s = eval(input("Enter s: "))
That's extremely dangerous and inadvisable, so it's better to go with
3.3 or the raw_input function.
Passing it through float() is, most likely, the right way to do this.
But what do you mean by "the result... is wrong"? That's the bit to
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