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Use black with -l 120 param.
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@@ -68,6 +68,6 @@ class NotificationManager:
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:returns: instance of NotificationManager
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"""
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if not hasattr(NotificationManager, '_instance') or NotificationManager._instance is None:
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if not hasattr(NotificationManager, "_instance") or NotificationManager._instance is None:
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NotificationManager._instance = NotificationManager()
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return NotificationManager._instance
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