gh-39231: fix and activate some checks in ruff-minimal
    
This is fixing some ruff warnings and turning on the corresponding
checks.

### 📝 Checklist

- [x] The title is concise and informative.
- [x] The description explains in detail what this PR is about.
    
URL: #39231
Reported by: Frédéric Chapoton
Reviewer(s): Martin Rubey

Author: Release Manager

src/sage/combinat/matrices/latin.py

@@ -1212,7 +1212,8 @@ def disjoint_mate_dlxcpp_rows_and_map(self, allow_subtrade):
 
                     dlx_rows.append([c_OFFSET, r_OFFSET, xy_OFFSET])
 
-                    max_column_nr = max(max_column_nr, max(c_OFFSET, r_OFFSET, xy_OFFSET))
+                    max_column_nr = max(max_column_nr, c_OFFSET,
+                                        r_OFFSET, xy_OFFSET)
 
         # We will have missed some columns. We
         # have to add 'dummy' rows so that the C++ DLX solver will find

src/sage/doctest/control.py

@@ -1351,12 +1351,12 @@ def run_val_gdb(self, testing=False):
         opt = self.options
 
         if opt.gdb:
-            cmd = f'''exec gdb --eval-command="run" --args '''
+            cmd = '''exec gdb --eval-command="run" --args '''
             flags = ""
             if opt.logfile:
                 sage_cmd += f" --logfile {shlex.quote(opt.logfile)}"
         elif opt.lldb:
-            cmd = f'''exec lldb --one-line "process launch" --one-line "cont" -- '''
+            cmd = '''exec lldb --one-line "process launch" --one-line "cont" -- '''
             flags = ""
         else:
             if opt.logfile is None:

src/sage/functions/airy.py

@@ -241,7 +241,7 @@ def _evalf_(self, x, **kwargs):
             from sage.rings.real_mpfr import RR
             from sage.rings.cc import CC
             from sage.functions.other import real, imag
-            from scipy.special import airy as airy
+            from scipy.special import airy
             if x in RR:
                 y = airy(real(x))[0]
                 if parent is None:
@@ -341,7 +341,7 @@ def _evalf_(self, x, **kwargs):
             from sage.rings.real_mpfr import RR
             from sage.rings.cc import CC
             from sage.functions.other import real, imag
-            from scipy.special import airy as airy
+            from scipy.special import airy
             if x in RR:
                 y = airy(real(x))[1]
                 if parent is None:
@@ -680,7 +680,7 @@ def _evalf_(self, x, **kwargs):
             from sage.rings.real_mpfr import RR
             from sage.rings.cc import CC
             from sage.functions.other import real, imag
-            from scipy.special import airy as airy
+            from scipy.special import airy
             if x in RR:
                 y = airy(real(x))[2]
                 if parent is None:
@@ -782,7 +782,7 @@ def _evalf_(self, x, **kwargs):
             from sage.rings.real_mpfr import RR
             from sage.rings.cc import CC
             from sage.functions.other import real, imag
-            from scipy.special import airy as airy
+            from scipy.special import airy
             if x in RR:
                 y = airy(real(x))[3]
                 if parent is None:

src/sage/functions/log.py

@@ -8,7 +8,7 @@
 - Tomas Kalvoda (2015-04-01): Add :meth:`exp_polar()` (:issue:`18085`)
 """
 
-from sage.misc.functional import log as log
+from sage.misc.functional import log
 from sage.misc.lazy_import import lazy_import
 from sage.rings.integer import Integer
 from sage.rings.integer_ring import ZZ

src/sage/graphs/generators/random.py

@@ -1709,7 +1709,7 @@ def RandomKTree(n, k, seed=None):
 
     # A graph with treewidth 0 has no edges
     if k == 0:
-        g = Graph(n, name=f"Random 0-tree")
+        g = Graph(n, name="Random 0-tree")
         return g
 
     if n < k + 1:
@@ -1803,7 +1803,7 @@ def RandomPartialKTree(n, k, x, seed=None):
 
     # A graph with treewidth 0 has no edges
     if k == 0:
-        g = Graph(n, name=f"Random partial 0-tree")
+        g = Graph(n, name="Random partial 0-tree")
         return g
 
     if n < k + 1:

src/sage/misc/package_dir.py

@@ -603,7 +603,7 @@ def handle_file(root, file):
             else:
                 handle_file(*os.path.split(path))
 
-    print(f"sage --fixdistributions: checking consistency")
+    print("sage --fixdistributions: checking consistency")
 
     for package in ordinary_packages:
         if len(package_distributions_per_directives[package]) > 1:

src/sage/modules/with_basis/representation.py

@@ -1895,7 +1895,7 @@ def __init__(self, rep, degree, **options):
         R = rep.base_ring()
         dim = rep.dimension()
         if degree not in ZZ or degree < 0:
-            raise ValueError(f"the degree must be a nonnegative integer")
+            raise ValueError("the degree must be a nonnegative integer")
         self._symalg = PolynomialRing(R, 'e', dim)
         self._basis_order = list(rep.basis().keys())
         G = self._symalg.gens()

src/sage/quadratic_forms/quadratic_form__ternary_Tornaria.py

@@ -129,8 +129,7 @@ def adjoint(self):
         [ * 19 4 ]
         [ * * 8 ]
     """
-    from sage.quadratic_forms.quadratic_form import QuadraticForm as QuadraticForm
-
+    from sage.quadratic_forms.quadratic_form import QuadraticForm
     if is_odd(self.dim()):
         return QuadraticForm(self.matrix().adjoint_classical() * 2)
     return QuadraticForm(self.matrix().adjoint_classical())

src/sage/schemes/curves/projective_curve.py

@@ -2300,7 +2300,7 @@ def __init__(self, A, f):
                 self._open_affine_index = i
                 break
         else:
-            assert "no projective curve defined"
+            raise ValueError("no projective curve defined")
 
     def function_field(self):
         """

src/sage/schemes/elliptic_curves/ell_curve_isogeny.py

@@ -3319,12 +3319,13 @@ def dual(self):
 
         else:
             # trac 7096
-            # this should take care of the case when the isogeny is not normalized.
+            # this should take care of the case when the isogeny is
+            # not normalized.
             u = self.scaling_factor()
             E2 = E2pr.change_weierstrass_model(u/F(d), 0, 0, 0)
 
             phi_hat = EllipticCurveIsogeny(E1, None, E2, d)
-#            assert phi_hat.scaling_factor() == 1
+            # assert phi_hat.scaling_factor() == 1
 
             for pre_iso in self._codomain.isomorphisms(E1):
                 for post_iso in E2.isomorphisms(self._domain):
@@ -3335,7 +3336,7 @@ def dual(self):
                     continue
                 break
             else:
-                assert "bug in dual()"
+                raise RuntimeError("bug in dual()")
 
             phi_hat._set_pre_isomorphism(pre_iso)
             phi_hat._set_post_isomorphism(post_iso)