>
> I will get `# Error: TypeError: file <maya console> line 9: Invalid
> arguments for flag 'changeCommand'. Expected string or function, got
> NoneType # `
>
You need to pass the function object to change commands, currently you are
passing the result of calling greet().
I think this should work for you:
import maya.cmds as cmds
def greet(value):
print 'greet was called with value: {0}'.format(value)
print 'hello'
def main():
cmds.window()
cmds.columnLayout()
# () was added into greet under the command flag
cmds.symbolCheckBox(image='circle.png', changeCommand=greet)
cmds.showWindow()
main()
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