moved asset loading into seperate file

assets.py

@@ -0,0 +1,12 @@
+from PyQt5.QtGui import QIcon, QPixmap
+
+
+# These are function in order not to trigger:
+# Must construct a QGuiApplication before a QPixmap
+
+logo = lambda: QPixmap("assets/logo.png")
+icon = lambda: QIcon("assets/icon.png")
+char = lambda: QIcon("assets/char.png")
+
+
+

mainwin.py

@@ -4,6 +4,7 @@ from PyQt5.QtCore import Qt
 from PyQt5.QtWidgets import QMainWindow, QSplitter
 from PyQt5.QtGui import QIcon
 
+import assets
 from dictlist import DictList
 from mdi import MDIArea, MDISubPlot
 
@@ -17,7 +18,7 @@ class MainWindow(QMainWindow):
         super().__init__(*args, **kwargs)
         self.setWindowTitle(title)
 
-        self.setWindowIcon(QIcon("assets/icon.png"))
+        self.setWindowIcon(assets.icon())
 
         data = {
             "sine": [X, np.sin(X)],

mdi.py

@@ -2,6 +2,8 @@ from PyQt5.QtCore import Qt
 from PyQt5.QtWidgets import QMdiArea, QMdiSubWindow, QAction
 from PyQt5.QtGui import QIcon, QPixmap, QPainter, QColor
 from pyqtgraph import PlotWidget
+
+import assets
 from theme import MDI_BKG
 
 
@@ -16,7 +18,7 @@ class MDIArea(QMdiArea):
         menu.addAction("Close All")
         menu.triggered[QAction].connect(self.on_menu_select)
 
-        self.logo = QPixmap("assets/logo.png")
+        self.logo = assets.logo()
 
 
     def on_menu_select(self, p):
@@ -60,7 +62,7 @@ class MDISubPlot(QMdiSubWindow):
         super().__init__(*args, **kwargs)
         self.setWindowTitle(title)
 
-        self.setWindowIcon(QIcon("assets/char.png"))
+        self.setWindowIcon(assets.char())
 
         # without this, the SubWindow is not removed from the subWindowList
         self.setAttribute(Qt.WA_DeleteOnClose)