diff --git a/lmfdb/classical_modular_forms/main.py b/lmfdb/classical_modular_forms/main.py
index d497a79789..89e6641a38 100644
--- a/lmfdb/classical_modular_forms/main.py
+++ b/lmfdb/classical_modular_forms/main.py
@@ -788,7 +788,7 @@ def newform_parse(info, query):
             query['is_largest'] = False
     parse_ints(info, query, 'hecke_ring_index')
     parse_ints(info, query, 'hecke_ring_generator_nbound')
-    if 'projective_image_type' in info and not 'projective_image' in info:
+    if 'projective_image_type' in info and 'projective_image' not in info:
         query['projective_image_type'] = info['projective_image_type']
     elif info.get('projective_image','').lower() in ["dn","dihedral"]:
         query["projective_image_type"] = "Dn"
@@ -850,7 +850,7 @@ def _AL_col(i, p):
                  align="center", short_title="projective image"),
     MultiProcessedCol("cm", "cmf.self_twist", "CM",
                       ["is_cm", "cm_discs"],
-                      lambda is_cm, cm_discs: ", ".join(map(quad_field_knowl, cm_discs)) if is_cm else ("None" if is_cm == False else "not computed"),
+                      lambda is_cm, cm_discs: ", ".join(map(quad_field_knowl, cm_discs)) if is_cm else ("None" if is_cm is False else "not computed"),
                       short_title="CM",
                       download_col="cm_discs"),
     MultiProcessedCol("rm", "cmf.self_twist", "RM",
diff --git a/lmfdb/classical_modular_forms/test_cmf.py b/lmfdb/classical_modular_forms/test_cmf.py
index 462a38405b..3a4d572ae8 100644
--- a/lmfdb/classical_modular_forms/test_cmf.py
+++ b/lmfdb/classical_modular_forms/test_cmf.py
@@ -281,18 +281,18 @@ def test_maximal(self):
         assert '1234.2.b.c' in page.get_data(as_text=True)
         page = self.tc.get("/ModularForm/GL2/Q/holomorphic/?level=1234&weight=2&is_maximal_largest=maximal")
         assert 'unique match' in page.get_data(as_text=True)
-        assert not '1234.2.a.h' in page.get_data(as_text=True)
+        assert '1234.2.a.h' not in page.get_data(as_text=True)
         assert '1234.2.a.i' in page.get_data(as_text=True)
-        assert not '1234.2.b.c' in page.get_data(as_text=True)
+        assert '1234.2.b.c' not in page.get_data(as_text=True)
         page = self.tc.get("/ModularForm/GL2/Q/holomorphic/?level=1234&weight=2&is_maximal_largest=largest")
         assert '5 matches' in page.get_data(as_text=True)
         assert '1234.2.a.h' in page.get_data(as_text=True)
         assert '1234.2.a.i' in page.get_data(as_text=True)
-        assert not '1234.2.b.c' in page.get_data(as_text=True)
+        assert '1234.2.b.c' not in page.get_data(as_text=True)
         page = self.tc.get("/ModularForm/GL2/Q/holomorphic/?level=1234&weight=2&is_maximal_largest=notlargest")
         assert '10 matches' in page.get_data(as_text=True)
-        assert not '1234.2.a.h' in page.get_data(as_text=True)
-        assert not '1234.2.a.i' in page.get_data(as_text=True)
+        assert '1234.2.a.h' not in page.get_data(as_text=True)
+        assert '1234.2.a.i' not in page.get_data(as_text=True)
         assert '1234.2.b.c' in page.get_data(as_text=True)
 
     def test_dim_table(self):
diff --git a/lmfdb/groups/abstract/main.py b/lmfdb/groups/abstract/main.py
index 6b83f65f3e..9f7afabace 100644
--- a/lmfdb/groups/abstract/main.py
+++ b/lmfdb/groups/abstract/main.py
@@ -1446,7 +1446,7 @@ def postprocess(self, res, info, query):  # need to convert representatives to h
         if not hasattr(self, 'counter_to_label'):
             self.counter_to_label = {}  # initialize dictionary
         gptuple = (res['group_order'],res['group_counter'])   # have we already found this group
-        if not gptuple in self.counter_to_label:
+        if gptuple not in self.counter_to_label:
             query_pow = {}  # need this dict to get all the power labels
             query_pow['group_order'] = res['group_order']
             query_pow['group_counter'] = res['group_counter']
diff --git a/lmfdb/modular_curves/web_curve.py b/lmfdb/modular_curves/web_curve.py
index 50b2b67471..76d09261e6 100644
--- a/lmfdb/modular_curves/web_curve.py
+++ b/lmfdb/modular_curves/web_curve.py
@@ -187,10 +187,10 @@ def title_of_model(self, lines, nb_var, typ, smooth):
             return title
         elif typ == 2:
             #smooth is true, false, or none
-            if smooth == True:
+            if smooth is True:
                 return display_knowl('modcurve.plane_model', 'Smooth plane model')+\
                 " Smooth plane model"
-            elif smooth == False:
+            elif smooth is False:
                 return display_knowl('modcurve.plane_model', 'Singular plane model') +\
                 " Singular plane model"
             else: