Creating Python 2.7 Class

New problem with each command:

UnboundLocalError: local variable 'y' referenced before assignment

Any ideas on how to fix it?

It seems that the problem is under the def statements.

when I call on "invert_y_axis()" It gives me errors. same when I call on the zero_variables().

But when I bring out the values in zero_variables() by removing them from under that statement, and moving them to when the module is imported, I can >>> print a.

Any ideas or quick fixes?

Still no luck.  Could someone fix this code so that it works?

There is a problem with declearing variables.

You should see once you run it.

Attached is the module and the test script I am using.

Please tell me how I can fix the problem.  Nothing seems to work.

Hi - I'm still learning Python myself but I was able to get it to run by making this change to adding "a = 0" at the beginning of CMDmodule.py:

afustini@lappy486:~/Downloads$ head CMDmodule.py
# C:\python27\Lib


a = 0
'''
Invert Code for Arduino PWM when Digital
Channel is 'LOW' along with a few other
bits and pieces.
'''


##set_zero = 0

And running it seems to be ok (no error at least):

afustini@lappy486:~/Downloads$ python ./Test\ Program\ for\ CMDmodule.py
Welcome to CMDmodule.  Use Wisely. 
Valables set to Zero!
Change this value Test: 23
23
Change this value Test: 45 
45
Change this value Test:

Based on what I was reading here:

http://stackoverflow.com/questions/423379/using-global-variables-in-a-function-other-than-the-one-that-created-them

However, I'm wondering is there are reason that you are using globals heavily?  I'm still developing my sense of style for python but this would seem to be very un-"pythonic" as they say. 

I'm not sure if this will help or not, but I thought it might give an example of something I've done.  Recently I wrote a  LCD twitter display with Python.  Initially, I wrote it as a procedural program since I don't know Python that well:

https://github.com/pdp7/tweetypi/blob/master/display-hashtag.py

I'm still working on improving the code, but what I tried to do is pass data that won't change for a given instance of the HashTagDisplay class in the constructor (__init__) like the number of rows and columns for the LCD.

The constructor then sets attributes self.rows and self.cols that the methods in the HashTagDisplay class refer to.

However, I decided to pass that hashtag to search as a parameter to the HashTagDisplay.search() method which returns the results.  The HashTagDisplay.display() method then takes those results as a parameter:

My main program can thus just create a new HashTagDisplay object with the appropriate LCD parameters and then call the search and display methods in a loop:

I think that you should be able avoid globals by either setting attributes in an object or passing parameters to a method and utilizing the return value.

I'm not sure if this will help or not, but I thought it might give an example of something I've done.  Recently I wrote a  LCD twitter display with Python.  Initially, I wrote it as a procedural program since I don't know Python that well:

https://github.com/pdp7/tweetypi/blob/master/display-hashtag.py

I'm still working on improving the code, but what I tried to do is pass data that won't change for a given instance of the HashTagDisplay class in the constructor (__init__) like the number of rows and columns for the LCD.

The constructor then sets attributes self.rows and self.cols that the methods in the HashTagDisplay class refer to.

However, I decided to pass that hashtag to search as a parameter to the HashTagDisplay.search() method which returns the results.  The HashTagDisplay.display() method then takes those results as a parameter:

My main program can thus just create a new HashTagDisplay object with the appropriate LCD parameters and then call the search and display methods in a loop:

I think that you should be able avoid globals by either setting attributes in an object or passing parameters to a method and utilizing the return value.