--- ./wrappers/Python/CoolProp/Plots/psy.py.orig	2022-05-06 08:58:46.000000000 +0200
+++ ./wrappers/Python/CoolProp/Plots/psy.py	2022-05-13 21:41:27.000000000 +0200
@@ -2,18 +2,23 @@
 # -*- coding: utf-8 -*-
 
 import os
-import cPickle
-from ConfigParser import ConfigParser
+import pickle
+from configparser import ConfigParser
 
 import numpy as np
 
-from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg
 from pylab import Figure
 
 from CoolProp.HumidAirProp import HAProps, HAProps_Aux
 
-from PyQt4.QtGui import (QDialog, QGridLayout, QProgressBar, QLabel,
-                         QDialogButtonBox, QPushButton, QFileDialog, QApplication)
+try:
+    from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg
+    from PyQt4.QtGui import (QDialog, QGridLayout, QProgressBar, QLabel,
+                             QDialogButtonBox, QPushButton, QFileDialog, QApplication)
+except ImportError:
+    from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg
+    from PyQt5.QtWidgets import (QDialog, QGridLayout, QProgressBar, QLabel,
+                                 QDialogButtonBox, QPushButton, QFileDialog, QApplication)
 
 Preferences = ConfigParser()
 config_path = os.path.join(os.path.dirname(__file__), "psyrc")
@@ -402,7 +407,7 @@
         filename = "%i.pkl" % P
         if os.path.isfile(filename):
             with open(filename, "r") as archivo:
-                data = cPickle.load(archivo)
+                data = pickle.load(archivo)
                 self.status.setText("Loading cached data...")
                 QApplication.processEvents()
         else:
@@ -410,7 +415,7 @@
             self.status.setText("Calculating data, be patient...")
             QApplication.processEvents()
             data = PsyCoolprop.calculatePlot(self)
-            cPickle.dump(data, open(filename, "w"))
+            pickle.dump(data, open(filename, "w"))
             self.progressBar.setVisible(False)
         self.status.setText("Plotting...")
         QApplication.processEvents()