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test_configure_screen uses theDISPLAY environment variable, which is only relevant to X11; and the purpose of the test is to set the-screen option for a toplevel, which is only useful on Tk for X11, since Tk for the Win32 or Aqua windowing systems only support a single “screen” (called:0 by default).
I use XQuartz installed from MacPorts, and so theDISPLAY environment variable is usually set. test_configure_screen tries to useDISPLAY even if I am running the test on Tk Aqua:
======================================================================ERROR: test_configure_screen (test.test_tkinter.test_widgets.ToplevelTest.test_configure_screen)----------------------------------------------------------------------Traceback (most recent call last): File "/Users/user/git/cpython/Lib/test/test_tkinter/test_widgets.py", line 86, in test_configure_screen widget2 = self.create(screen=display) ^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/user/git/cpython/Lib/test/test_tkinter/test_widgets.py", line 69, in create return tkinter.Toplevel(self.root, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Users/user/git/cpython/Lib/tkinter/__init__.py", line 2678, in __init__ BaseWidget.__init__(self, master, 'toplevel', cnf, {}, extra) File "/Users/user/git/cpython/Lib/tkinter/__init__.py", line 2629, in __init__ self.tk.call(_tkinter.TclError: couldn't connect to display "/private/tmp/com.apple.launchd.yqEvGPTxFm/org.macports:0"