What does the error message "python pynput ERROR: failed to acquire X connection: Bad display name '', DisplayNameError('')" mean?

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The error message "python pynput ERROR: failed to acquire X connection: Bad display name '', DisplayNameError('')" means that the pynput library is unable to establish a connection with the X windowing system. This could be due to incorrect display settings or configurations. X connection is required to interact with the graphical user interface on Unix or Unix-like operating systems.