Improve packaging and modularity

fishui/FishUI.py

+from PySide2.QtCore import Qt
+from PySide2.QtGui import QPalette, QColor
+from PySide2.QtWidgets import QApplication
+from fishui.MainWindow import MainWindow
+
+
+def run():
+    return FishUI().run()
+
+
+class FishUI:
+
+    def __init__(self):
+        # Create application
+        self.app = QApplication()
+
+        # Set dark style
+        self.app.setStyle("Fusion")
+        palette = QPalette()
+        palette.setColor(QPalette.Window, QColor(53, 53, 53))
+        palette.setColor(QPalette.WindowText, Qt.white)
+        palette.setColor(QPalette.Base, QColor(25, 25, 25))
+        palette.setColor(QPalette.AlternateBase, QColor(53, 53, 53))
+        palette.setColor(QPalette.ToolTipBase, Qt.white)
+        palette.setColor(QPalette.ToolTipText, Qt.white)
+        palette.setColor(QPalette.Text, Qt.white)
+        palette.setColor(QPalette.Button, QColor(53, 53, 53))
+        palette.setColor(QPalette.ButtonText, Qt.white)
+        palette.setColor(QPalette.BrightText, Qt.red)
+        palette.setColor(QPalette.Link, QColor(42, 130, 218))
+        palette.setColor(QPalette.Highlight, QColor(42, 130, 218))
+        palette.setColor(QPalette.HighlightedText, Qt.black)
+        self.app.setPalette(palette)
+
+        # Create main window
+        self.mainWindow = MainWindow()
+
+    def run(self):
+        self.mainWindow.show()
+        return self.app.exec_()

fishui/__init__.py

+from .FishUI import FishUI, run
+
+__all__ = ['FishUI', 'run']

main.py

 import sys
-from PySide2.QtCore import Qt
-from PySide2.QtGui import QPalette, QColor
-from PySide2.QtWidgets import QApplication
-from fishui.MainWindow import MainWindow
+import fishui
 
-
-if __name__ == '__main__':
-    # Create the application
-    app = QApplication()
-
-    # Set dark style
-    app.setStyle("Fusion")
-    palette = QPalette()
-    palette.setColor(QPalette.Window, QColor(53, 53, 53))
-    palette.setColor(QPalette.WindowText, Qt.white)
-    palette.setColor(QPalette.Base, QColor(25, 25, 25))
-    palette.setColor(QPalette.AlternateBase, QColor(53, 53, 53))
-    palette.setColor(QPalette.ToolTipBase, Qt.white)
-    palette.setColor(QPalette.ToolTipText, Qt.white)
-    palette.setColor(QPalette.Text, Qt.white)
-    palette.setColor(QPalette.Button, QColor(53, 53, 53))
-    palette.setColor(QPalette.ButtonText, Qt.white)
-    palette.setColor(QPalette.BrightText, Qt.red)
-    palette.setColor(QPalette.Link, QColor(42, 130, 218))
-    palette.setColor(QPalette.Highlight, QColor(42, 130, 218))
-    palette.setColor(QPalette.HighlightedText, Qt.black)
-    app.setPalette(palette)
-
-    # Create the main window
-    mainWindow = MainWindow()
-    mainWindow.show()
-
-    # Run the main event loop
-    sys.exit(app.exec_())
+sys.exit(fishui.run())