sage.quadratic_forms: Fix use of staticmethod for Python < 3.10

Author: Matthias Koeppe

src/sage/quadratic_forms/genera/genus.py

@@ -121,7 +121,8 @@ def genera(sig_pair, determinant, max_scale=None, even=False):
     return genera
 
 
-genera = staticmethod(genera)
+# #35557: In Python < 3.10, a staticmethod cannot be called directly
+_genera_staticmethod = staticmethod(genera)
 
 
 def _local_genera(p, rank, det_val, max_scale, even):

src/sage/quadratic_forms/quadratic_form.py

@@ -502,9 +502,8 @@ class QuadraticForm(SageObject):
         ])
 
     # Genus
-    lazy_import("sage.quadratic_forms.genera.genus", [
-            "genera"
-        ])
+    lazy_import("sage.quadratic_forms.genera.genus",
+                "_genera_staticmethod", as_="genera")
 
     def __init__(self, R, n=None, entries=None, unsafe_initialization=False, number_of_automorphisms=None, determinant=None):
         """