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Circular progress bar tkinter

Language: Layout:
+ ] Show input
Absolute running time: 0.36 sec, cpu time: 0.42 sec, memory peak: 20 Mb, absolute service time: 0,37 sec 
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Error(s), warning(s):
Traceback (most recent call last):
  File "source_file.py", line 78, in <module>
    app = Application()
  File "source_file.py", line 55, in __init__
    tk.Frame.__init__(self, master)
  File "/usr/lib/python3.5/tkinter/__init__.py", line 2587, in __init__
    Widget.__init__(self, master, 'frame', cnf, {}, extra)
  File "/usr/lib/python3.5/tkinter/__init__.py", line 2135, in __init__
    BaseWidget._setup(self, master, cnf)
  File "/usr/lib/python3.5/tkinter/__init__.py", line 2110, in _setup
    _default_root = Tk()
  File "/usr/lib/python3.5/tkinter/__init__.py", line 1871, in __init__
    self.tk = _tkinter.create(screenName, baseName, className, interactive, wantobjects, useTk, sync, use)
_tkinter.TclError: no display name and no $DISPLAY environment variable