[Tkinter] Label doesn't refresh

[jollydragon]

it works by commenting the line

#          if len(absPath) > 40:  absPath = ' ...%s' % absPath[-37:]  

There must be a problem with this line

Thanks for reminding. But why is it that line? How to modify?

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add to __init__

Thank you so much and it works. But why the variable "tkinter.StringVar()" must be defined in "__init__()"? Why can't in the function of class?