Creating Python 2.7 Class

I think it must be due to some aspect of using globals.  I would think globals wouldn't be the best way to handle this anyways.  What do you think of changing pwm_formula_test() to accept a parameter and then having it return a value?

afustini@lappy486:~/Downloads$ python ./Test\ Program\ for\ CMDmodule.py

Welcome to CMDmodule.  Use Wisely.

Valables set to Zero!

Change this value Test: 25

6375.0

so that method in your class would be:

    def pwm_formula_test(self, a):

        PWM = 255

        aa = PWM*a

        aa = round(aa, 1)

        motor_a = aa

        return aa

and you test script would have:

while True:

    a = input("Change this value Test: ")

    b = CMD.pwm_formula_test(a)

    print b

I don't mind how it goes about solving the problem.  I just want it to work.

I was using globals because I read somewhere that 'that was the go'.  I don't know any better.

Does the way you suggested above work?

The snippets I posted above in http://www.element14.com/community/message/65629#65661 do work.

This adds a parameter "a":

    def pwm_formula_test(self, a):

"a" is then multiplied by 255 ("PWM" value) and stored in "aa".  "aa" is the rounded to one decimal place.  The method returns the value of "aa".  This is value stored in "b":

    b = CMD.pwm_formula_test(a)

I'm a little unclear as to the objective of your program though.  What is the objective?

That is correct.  Thank you.  I will test it later.

But what if I want to use the fomula for a different variable?

I'm a little unclear as to the objective of your program though.  What is the objective?

The objective is to read imput from  a joystick and then make the values go through that formula so that they can be read correctly by the arduino.

This branch of the project is so that it is easier for others to understand the code.  I want to eventually write a 'guide' so that others can replicate this project.  Having little pieces of code in a library/class should make it easier for others to learn.

I posted here:  http://www.raspberrypi.org/phpBB3/viewtopic.php?p=225261#p225261  all the different things I am using to make this work.  That is just another little issue I am having with the Gertboard but for the same project.

Hope that helps clear up your understanding.

But what if I want to use the fomula for a different variable?

Do you mean pass a different variable to the pwm_formula_test() method?  You can just call it again with a different value as the parameter.  Is that what you mean?

yep. I will look at this some other time.  Other parts of the project must be completed first.  This was just to kill some time and build apon my own knowledge of python.

Thanks for all your help.