Type float doesn't have expected attribute '__div__'

[sparkz_alot]

I'm playing with some formulas and I ran across this warning
 Type float doesn't have expected attribute '__div__' with the  "resist_2" in this line:

volt_div(volt_in, resist_1, resist_2)

Here is the full function:

def volt_div(v_in, res_1, res_2):
    # resistor_2 = res_2    # Needed to make Python's __div__ happy
    v_out = v_in * (res_2 / (res_1 + res_2))

    print("Output of voltage divider = {:.4f} VDC".format(v_out))
    return

volt_in = 10.0
resist_1 = 10.0
resist_2 = 10.0

volt_div(volt_in, resist_1, resist_2)

It doesn't seem to affect the outcome, but I am curious as to what it means.

[micseydel]

Is that coming from Pycharm? I just tried it on OS X, Python 3.5.2 and Python 2.7.12 without seeing that message.

[sparkz_alot]

Yes, sorry, it's a warning in Pycharm.  The only info it gives is it's related to "dynamic dispatch and duck typing...".  What I find confusing  is if I rename (declare?) the variable within the function (renaming "res_2" to "resistor_2)" the warning goes away.  That, however seems a rather clunky way of fixing a problem,

[Larz60+]

python 3 uses __truediv__ instead of __div__ (and __floordiv__)

from docs:

operator.truediv(a, b)
operator.__truediv__(a, b)

    Return a / b where 2/3 is .66 rather than 0. This is also known as “true” division.

[sparkz_alot]

So it's simply saying it's not backward compatible?  It's rather late and my brain is not as sharp as it should be (if it ever is) but why would it make a difference if the variable is defined within the function (which is apparently o.k.) as opposed to being passed to the function (which is not o.k.)

[micseydel]

I'm fairly certain it's a Pycharm issue similar to https://intellij-support.jetbrains.com/h...arm-2017-1

[sparkz_alot]

Thanks for going to the trouble of finding that post, I seriously doubt I would have found it.  I was certain it was a problem with how I had defined the function, it never crossed my mind it might be a problem with Pycharm.

Thanks again.

[Larz60+]

but why would it make a difference if the variable is defined within the function

It shouldn't, micsydel has to be right

There are other things in PyCharm that I haven't liked lately,
auto indent doesn't work properly with cut and paste for one and it's quite annoying.

[wavic]

The function is quite simple in order to cause this.