Maya Python static class function scope - maya

Question

I have some trouble getting my static class to work. There is something I am missing about the scope of functions within a class. If called the script gives me following error:
NameError: global name 'disableCostumFrames' is not defined #
import maya.cmds as cmds
from functools import partial
class Blast:
def createWindow():
# Todo:
# hanldes the gui for the user
windowID = 'window'
if cmds.window(windowID, exists = True):
cmds.deleteUI('window')
window = cmds.window(windowID, title="Blast", iconName='Blast', widthHeight=(400, 200) )
cmds.frameLayout( label='')
cmds.rowColumnLayout( numberOfColumns=4, columnWidth=[(1, 100),(3, 100)] )
cmds.text( label='Start: ' )
global Blast_startFrame
Blast_startFrame = cmds.textField( enable = False)
cmds.text( label=' End: ' )
global Blast_endFrame
Blast_endFrame = cmds.textField( enable = False)
cmds.setParent('..')
cmds.rowColumnLayout( numberOfColumns=2, columnWidth=[(1, 100), (2, 100)] )
cmds.radioCollection()
#cmds.radioButton( label='Full', select = True, onCommand= partial(disableCostumFrames, Blast_startFrame, Blast_endFrame ) )
#cmds.radioButton( label='Costum', onCommand= partial(enableCostumFrames, Blast_startFrame, Blast_endFrame ) )
cmds.setParent('..')
cmds.rowColumnLayout( numberOfColumns=1, columnWidth=[(1, 400), (2, 100)] )
cmds.button( label='Playblast' ,command= 'createPlayblast')
cmds.setParent('..')
cmds.showWindow( window )
return Blast_startFrame, Blast_endFrame
def main():
createWindow()
def enableCostumFrames(Blast_startFrame, Blast_endFrame, *args):
cmds.textField(Blast_startFrame, edit=True, enable=True)
cmds.textField(Blast_endFrame, edit=True, enable=True)
def disableCostumFrames(Blast_startFrame, Blast_endFrame, *args):
cmds.textField(Blast_startFrame, edit=True, text="", enable=False)
cmds.textField(Blast_endFrame, edit=True, text="", enable=False)
How do I need to define these functions within the class? I am calling the module like that:
import sys
Dir = 'c:/Blast'
if Dir not in sys.path:
sys.path.append(Dir)
try: reload(Blast_v011)
except: import Blast_v011
Blast_v011.Blast()
maybe iam doing something wrong on this side? Appreciated any help.

Answer 1

In this case you need to add a self reference to all of the methods in your class. The usual python class looks like this:
class MyClass(object):
def __init__(self):
self.variable = 123
def some_method(self):
print "my variable = ", self.variable
def some_other_method(self):
if self.variable > 1:
self.some_method()
The self reference in the member functions is how you get at class member variables and other functions -- it's python's way of referring to what other languages call this.
Instance methods can only be called on an instance (it's the instance that gets passed in as self). You can make a method that is called on the class itself -- rather than any particular instance of the class -- using the #classmethod decorator. Classmethods also take an argument, but instead of self it's a reference to the class. You use it the same way to get variables defined at the class level, which are shared by all copies of the class:
class HasShared(object):
shared = 99
#classmethod
def a_class_method(cls):
print cls.shared
(You can mix and match class and instance methods in the same class).
You can also make static methods using the #staticmethod decorator. These don't get a default argument at all:
class NotPythonic(object):
#staticmethod
def needs_no_args():
print "call me as NotPythonic.needs_no_args()"
In Python we tend to avoid this formula, since you can get a static method by just creating a function in a module without making a class to hold them. For the example code you posted, I'd probably just make a conventional class using instance methods, since your functions need the names of the gui widgets to be able to actually ask them questions.