[Tutor] Simple variable type question

[Wayne Werner]

On Fri, Feb 5, 2010 at 10:54 AM, Antonio de la Fuente <toni at muybien.org>wrote:

> Hi all,
>
> I'm trying to do exercises from:
>
> http://openbookproject.net/thinkcs/python/english2e/ch05.html
>
> exercise number 3 (slope function) and when I run it:
>
> python ch05.py -v
>
> the doctest for the slope function failed, because is expecting a
> floating point value and not an integer:
>

try to cast your values as float instead:

try:
    x1 = float(x1)
    x2 = float(x2)
    y1 = float(y1)
    y2 = float(y2)
except ValueError:
    print "Error, not a floating point!"
    raise

Then you don't need to worry about the * 1.0

HTH,
Wayne


>
> Failed example:
>    slope(2, 4, 1, 2)
> Expected:
>    2.0
> Got:
>    2
>
> This is the function, and how I modified so it would return a floating
> point value (multiply by 1.0). But this doesn't feel the right way to
> do things, or is it?
>
> def slope(x1, y1, x2, y2):
>    """
>    >>> slope(5, 3, 4, 2)
>    1.0
>    >>> slope(1, 2, 3, 2)
>    0.0
>    >>> slope(1, 2, 3, 3)
>    0.5
>    >>> slope(2, 4, 1, 2)
>    2.0
>    """
>    result_slope = ((y2 - y1) / (x2 - x1)) * 1.0
>    return result_slope
>
> Another question is, anybody knows if these questions from this online
> book are answered somewhere? I can't manage to find them?
>
> Thank you for your time.
> Antonio.
>
> --
> -----------------------------
> Antonio de la Fuente Martínez
> E-mail: toni at muybien.org
> -----------------------------
>
> Guarda que comer y no que hacer.
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