diff --git a/.gitignore b/.gitignore
index de60a422..0397fbf6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -38,5 +38,6 @@ friture.egg-info
 Notepad++
 .idea
 .vscode
+.qt_for_python
 
 .mypy_cache
\ No newline at end of file
diff --git a/friture/histplot.py b/friture/histplot.py
index 7a934cc2..c903c90e 100644
--- a/friture/histplot.py
+++ b/friture/histplot.py
@@ -412,11 +412,11 @@ def setspecrange(self, spec_min, spec_max):
         self.update()
 
     def setweighting(self, weighting):
-        if weighting is 0:
+        if weighting == 0:
             title = "PSD (dB)"
-        elif weighting is 1:
+        elif weighting == 1:
             title = "PSD (dB A)"
-        elif weighting is 2:
+        elif weighting == 2:
             title = "PSD (dB B)"
         else:
             title = "PSD (dB C)"
diff --git a/friture/imageplot.py b/friture/imageplot.py
index 06b1b75f..fa7ddda5 100644
--- a/friture/imageplot.py
+++ b/friture/imageplot.py
@@ -310,11 +310,11 @@ def setspecrange(self, spec_min, spec_max):
         self.update()
 
     def setweighting(self, weighting):
-        if weighting is 0:
+        if weighting == 0:
             title = "PSD (dB)"
-        elif weighting is 1:
+        elif weighting == 1:
             title = "PSD (dB A)"
-        elif weighting is 2:
+        elif weighting == 2:
             title = "PSD (dB B)"
         else:
             title = "PSD (dB C)"
diff --git a/friture/octavespectrum.py b/friture/octavespectrum.py
index 8f65e86a..4c49f700 100644
--- a/friture/octavespectrum.py
+++ b/friture/octavespectrum.py
@@ -116,11 +116,11 @@ def handle_new_data(self, floatdata):
 
         sp = array(sp)
 
-        if self.weighting is 0:
+        if self.weighting == 0:
             w = 0.
-        elif self.weighting is 1:
+        elif self.weighting == 1:
             w = self.filters.A
-        elif self.weighting is 2:
+        elif self.weighting == 2:
             w = self.filters.B
         else:
             w = self.filters.C
diff --git a/friture/spectrogram.py b/friture/spectrogram.py
index 19197632..b040520f 100644
--- a/friture/spectrogram.py
+++ b/friture/spectrogram.py
@@ -218,11 +218,11 @@ def setweighting(self, weighting):
 
     def update_weighting(self):
         A, B, C = self.proc.get_freq_weighting()
-        if self.weighting is 0:
+        if self.weighting == 0:
             self.w = array([0.])
-        elif self.weighting is 1:
+        elif self.weighting == 1:
             self.w = A
-        elif self.weighting is 2:
+        elif self.weighting == 2:
             self.w = B
         else:
             self.w = C
diff --git a/friture/spectrum.py b/friture/spectrum.py
index 9cfc1af5..e170bb2a 100644
--- a/friture/spectrum.py
+++ b/friture/spectrum.py
@@ -239,11 +239,11 @@ def setweighting(self, weighting):
 
     def update_weighting(self):
         A, B, C = self.proc.get_freq_weighting()
-        if self.weighting is 0:
+        if self.weighting == 0:
             self.w = zeros(A.shape)
-        elif self.weighting is 1:
+        elif self.weighting == 1:
             self.w = A
-        elif self.weighting is 2:
+        elif self.weighting == 2:
             self.w = B
         else:
             self.w = C
diff --git a/friture/spectrumPlotWidget.py b/friture/spectrumPlotWidget.py
index d4d7065b..d563ee7a 100644
--- a/friture/spectrumPlotWidget.py
+++ b/friture/spectrumPlotWidget.py
@@ -107,11 +107,11 @@ def setspecrange(self, spec_min, spec_max):
         self.normVerticalScaleTransform.setRange(spec_min, spec_max)
 
     def setweighting(self, weighting):
-        if weighting is 0:
+        if weighting == 0:
             title = "PSD (dB)"
-        elif weighting is 1:
+        elif weighting == 1:
             title = "PSD (dB A)"
-        elif weighting is 2:
+        elif weighting == 2:
             title = "PSD (dB B)"
         else:
             title = "PSD (dB C)"