Fix some cannot

src/sage/combinat/alternating_sign_matrix.py

@@ -1197,7 +1197,7 @@ def _element_constructor_(self, asm, check=True):
         if isinstance(asm, AlternatingSignMatrix):
             if asm.parent() is self:
                 return asm
-            raise ValueError("Cannot convert between alternating sign matrices of different sizes")
+            raise ValueError("cannot convert between alternating sign matrices of different sizes")
         try:
             m = self._matrix_space(asm)
         except (TypeError, ValueError):

src/sage/combinat/decorated_permutation.py

@@ -213,7 +213,7 @@ def _element_constructor_(self, pi, check=True):
         if isinstance(pi, DecoratedPermutation):
             if pi.parent() is self:
                 return pi
-            raise ValueError("Cannot convert between decorated permutations of different sizes")
+            raise ValueError("cannot convert between decorated permutations of different sizes")
 
         pi = tuple(pi)
         if check and pi not in self:

src/sage/combinat/derangements.py

@@ -199,7 +199,7 @@ def _element_constructor_(self, der):
         if isinstance(der, Derangement):
             if der.parent() is self:
                 return der
-            raise ValueError("Cannot convert %s to an element of %s" % (der, self))
+            raise ValueError("cannot convert %s to an element of %s" % (der, self))
         return self.element_class(self, der)
 
     Element = Derangement

src/sage/data_structures/bounded_integer_sequences.pyx

@@ -1212,7 +1212,7 @@ cdef class BoundedIntegerSequence:
             sage: T+None
             Traceback (most recent call last):
             ...
-            TypeError: Cannot concatenate bounded integer sequence and None
+            TypeError: cannot concatenate bounded integer sequence and None
 
         TESTS:
 
@@ -1228,7 +1228,7 @@ cdef class BoundedIntegerSequence:
         """
         cdef BoundedIntegerSequence myself, right, out
         if other is None or self is None:
-            raise TypeError('Cannot concatenate bounded integer sequence and None')
+            raise TypeError('cannot concatenate bounded integer sequence and None')
         myself = self  # may result in a type error
         right = other  #  --"--
         if right.data.itembitsize != myself.data.itembitsize:

src/sage/geometry/lattice_polytope.py

@@ -5251,8 +5251,8 @@ def from_palp_index(i):
             elif o in range(65, 91):
                 i = o - 28
             else:
-                raise ValueError('Cannot convert PALP index '
-                                 + i + ' to number.')
+                raise ValueError('cannot convert PALP index '
+                                 + i + ' to number')
         return i
     n = len(permutation)
     domain = [from_palp_index(i) for i in permutation]
@@ -5261,6 +5261,7 @@ def from_palp_index(i):
     S = SymmetricGroup(n)
     return make_permgroup_element(S, domain)
 
+
 def _read_nef_x_partitions(data):
     r"""
     Read all nef-partitions for one polytope from a string or an open

src/sage/geometry/polyhedron/parent.py

@@ -697,7 +697,7 @@ def convert_base_ring_Hrep(lstlst):
             return self._element_constructor_polyhedron(polyhedron, mutable=mutable, **kwds)
         if nargs == 1 and args[0] == 0:
             return self.zero()
-        raise ValueError('Cannot convert to polyhedron object.')
+        raise ValueError('cannot convert to polyhedron object')
 
     def _element_constructor_polyhedron(self, polyhedron, **kwds):
         """

src/sage/libs/giac/giac.pyx

@@ -1409,7 +1409,7 @@ cdef class Pygen(GiacMethods_base):
             return result
 
         else:
-            raise TypeError("Cannot convert non giac integers to Integer")
+            raise TypeError("cannot convert non giac integers to Integer")
 
 
     def _rational_(self,Z=None):
@@ -1434,7 +1434,7 @@ cdef class Pygen(GiacMethods_base):
             # giac _RAT_
             return ZZ(self.numer()) / ZZ(self.denom())
         else:
-            raise TypeError("Cannot convert non giac _FRAC_ to QQ")
+            raise TypeError("cannot convert non giac _FRAC_ to QQ")
 
 
     def sage(self):
@@ -1736,7 +1736,7 @@ cdef class Pygen(GiacMethods_base):
                 sig_off()
                 return result
             else:
-                raise TypeError("Cannot convert non _INT_ giac gen")
+                raise TypeError("cannot convert non _INT_ giac gen")
 
 
     property _double:  # immediate double (type _DOUBLE_)
@@ -1750,7 +1750,7 @@ cdef class Pygen(GiacMethods_base):
                 sig_off()
                 return result
             else:
-                raise TypeError("Cannot convert non _DOUBLE_ giac gen")
+                raise TypeError("cannot convert non _DOUBLE_ giac gen")
 
     property help:
         def __get__(self):

src/sage/libs/pari/convert_sage.pyx

@@ -352,7 +352,7 @@ cpdef set_integer_from_gen(Integer self, Gen x):
             break
         elif paritype == t_PADIC:
             if x._valp() < 0:
-                raise TypeError("Cannot convert p-adic with negative valuation to an integer")
+                raise TypeError("cannot convert p-adic with negative valuation to an integer")
             # Lifting a PADIC yields an integer
             x = x.lift()
             break

src/sage/libs/singular/function.pyx

@@ -1304,7 +1304,7 @@ cdef class SingularFunction(SageObject):
                     dummy_ring = PolynomialRing(QQ, "dummy", implementation="singular") # seems a reasonable default
                 ring = dummy_ring
         if not (isinstance(ring, MPolynomialRing_libsingular) or isinstance(ring, NCPolynomialRing_plural)):
-            raise TypeError("Cannot call Singular function '%s' with ring parameter of type '%s'"%(self._name,type(ring)))
+            raise TypeError("cannot call Singular function '%s' with ring parameter of type '%s'" % (self._name,type(ring)))
         return call_function(self, args, ring, interruptible, attributes)
 
     def _instancedoc_(self):

src/sage/modules/vector_rational_dense.pyx

@@ -326,7 +326,7 @@ cdef class Vector_rational_dense(free_module_element.FreeModuleElement):
             mpq_set_z(a.value, (<Integer>left).value)
         else:
             # should not happen
-            raise TypeError("Cannot convert %s to %s" % (type(left).__name__, Rational.__name__))
+            raise TypeError("cannot convert %s to %s" % (type(left).__name__, Rational.__name__))
         z = self._new_c()
         cdef Py_ssize_t i
         for i in range(self._degree):
@@ -343,7 +343,7 @@ cdef class Vector_rational_dense(free_module_element.FreeModuleElement):
             mpq_set_z(a.value, (<Integer>right).value)
         else:
             # should not happen
-            raise TypeError("Cannot convert %s to %s" % (type(right).__name__, Rational.__name__))
+            raise TypeError("cannot convert %s to %s" % (type(right).__name__, Rational.__name__))
         z = self._new_c()
         cdef Py_ssize_t i
         for i in range(self._degree):

src/sage/rings/asymptotic/asymptotic_ring.py

@@ -4158,9 +4158,9 @@ def _element_constructor_(self, data, simplify=True, convert=True):
 
         elif is_PowerSeriesRing(P):
             raise NotImplementedError(
-                'Cannot convert %s from the %s to an asymptotic expansion '
+                'cannot convert %s from the %s to an asymptotic expansion '
                 'in %s, since growths at other points than +oo are not yet '
-                'supported.' % (data, P, self))
+                'supported' % (data, P, self))
             # Delete lines above as soon as we can deal with growths
             # other than the that at going to +oo.
             from sage.rings.infinity import PlusInfinity

src/sage/rings/integer.pyx

@@ -571,7 +571,7 @@ cdef class Integer(sage.structure.element.EuclideanDomainElement):
             sage: ZZ(pari(Qp(11)(11^-7)))
             Traceback (most recent call last):
             ...
-            TypeError: Cannot convert p-adic with negative valuation to an integer
+            TypeError: cannot convert p-adic with negative valuation to an integer
 
         Test converting a list with a very large base::
 
@@ -640,7 +640,7 @@ cdef class Integer(sage.structure.element.EuclideanDomainElement):
                 if n == x:
                     mpz_set_pylong(self.value, n)
                 else:
-                    raise TypeError("Cannot convert non-integral float to integer")
+                    raise TypeError("cannot convert non-integral float to integer")
 
             elif isinstance(x, pari_gen):
                 global set_integer_from_gen

src/sage/rings/number_field/number_field.py

@@ -8063,7 +8063,7 @@ def _coerce_from_other_number_field(self, x):
             sage: L(a)
             Traceback (most recent call last):
             ...
-            ValueError: Cannot convert a to Number Field in b with defining polynomial x^3 - 4*x + 1 with b = 1.860805853111704? (using the specified embeddings)
+            ValueError: cannot convert a to Number Field in b with defining polynomial x^3 - 4*x + 1 with b = 1.860805853111704? (using the specified embeddings)
 
         Subfields automatically come with an embedding::
 
@@ -8156,7 +8156,7 @@ def _coerce_from_other_number_field(self, x):
         f = x.minpoly()
         ys = f.roots(ring=K, multiplicities=False)
         if not ys:
-            raise ValueError("Cannot convert %s to %s (regardless of embeddings)" % (x, K))
+            raise ValueError("cannot convert %s to %s (regardless of embeddings)" % (x, K))
 
         # Define a function are_roots_equal to determine whether two
         # roots of f are equal.  A simple a == b does not suffice for
@@ -8213,7 +8213,7 @@ def _coerce_from_other_number_field(self, x):
             emb_y = y.polynomial()(Kgen)
             if are_roots_equal(emb_x, emb_y):
                 return y
-        raise ValueError("Cannot convert %s to %s (using the specified embeddings)" % (x, K))
+        raise ValueError("cannot convert %s to %s (using the specified embeddings)" % (x, K))
 
     def _coerce_map_from_(self, R):
         """
@@ -11220,7 +11220,7 @@ def _coerce_from_other_cyclotomic_field(self, x, only_canonical=False):
                     if z == x:
                         return self.zeta(m)**(r+1)
                     z *= y
-            raise TypeError("Cannot coerce %s into %s" % (x, self))
+            raise TypeError("cannot coerce %s into %s" % (x, self))
         return self._element_class(self, x)
 
     def _coerce_from_gap(self, x):

src/sage/rings/polynomial/multi_polynomial_ideal.py

@@ -2187,7 +2187,7 @@ def transformed_basis(self, algorithm="gwalk", other_ring=None, singular=singula
             return PolynomialSequence(nR, sorted([nR(f) for f in nIs],reverse=True), immutable=True)
 
         else:
-            raise TypeError("Cannot convert basis with given algorithm")
+            raise TypeError("cannot convert basis with given algorithm")
 
     @handle_AA_and_QQbar
     def elimination_ideal(self, variables, algorithm=None, *args, **kwds):

src/sage/rings/polynomial/polynomial_element.pyx

@@ -8027,11 +8027,11 @@ cdef class Polynomial(CommutativeAlgebraElement):
             sage: f.roots(RR)
             Traceback (most recent call last):
             ...
-            TypeError: Cannot evaluate symbolic expression to a numeric value.
+            TypeError: cannot evaluate symbolic expression to a numeric value
             sage: f.roots(CC)
             Traceback (most recent call last):
             ...
-            TypeError: Cannot evaluate symbolic expression to a numeric value.
+            TypeError: cannot evaluate symbolic expression to a numeric value
 
         We can find roots of polynomials defined over `\ZZ` or `\QQ`
         over the `p`-adics, see :trac:`15422`::

src/sage/rings/polynomial/polynomial_real_mpfr_dense.pyx

@@ -85,12 +85,12 @@ cdef class PolynomialRealDense(Polynomial):
             sage: PolynomialRealDense(RR['x'], [1,a])
             Traceback (most recent call last):
             ...
-            TypeError: Cannot evaluate symbolic expression to a numeric value.
+            TypeError: cannot evaluate symbolic expression to a numeric value
             sage: R.<x> = SR[]
             sage: (x-a).change_ring(RR)
             Traceback (most recent call last):
             ...
-            TypeError: Cannot evaluate symbolic expression to a numeric value.
+            TypeError: cannot evaluate symbolic expression to a numeric value
             sage: sig_on_count()
             0
 

src/sage/rings/real_double.pyx

@@ -947,7 +947,7 @@ cdef class RealDoubleElement(FieldElement):
             sage: ZZ(RDF(-2345.67))
             Traceback (most recent call last):
             ...
-            TypeError: Cannot convert non-integral float to integer
+            TypeError: cannot convert non-integral float to integer
         """
         return Integer(self._value)
 

src/sage/rings/real_mpfi.pyx

@@ -5356,7 +5356,8 @@ def __create__RealIntervalField_version0(prec, sci_not):
     """
     return RealIntervalField(prec, sci_not)
 
-## Keep all old versions!!!
+
+# Keep all old versions!!!
 def __create__RealIntervalFieldElement_version0(parent, x, base=10):
     """
     For pickling.
@@ -5368,6 +5369,7 @@ def __create__RealIntervalFieldElement_version0(parent, x, base=10):
     """
     return RealIntervalFieldElement(parent, x, base=base)
 
+
 def __create__RealIntervalFieldElement_version1(parent, lower, upper):
     """
     For pickling.

src/sage/rings/real_mpfr.pyx

@@ -2247,7 +2247,7 @@ cdef class RealNumber(sage.structure.element.RingElement):
             100000000000000000
         """
         if not mpfr_number_p(self.value):
-            raise ValueError('Cannot convert infinity or NaN to Sage Integer')
+            raise ValueError('cannot convert infinity or NaN to Sage Integer')
 
         cdef Integer z = Integer()
         mpfr_get_z(z.value, self.value, MPFR_RNDZ)
@@ -3236,7 +3236,7 @@ cdef class RealNumber(sage.structure.element.RingElement):
             <... 'int'>
         """
         if not mpfr_number_p(self.value):
-            raise ValueError('Cannot convert infinity or NaN to Python int')
+            raise ValueError('cannot convert infinity or NaN to Python int')
 
         cdef Integer z = Integer()
         mpfr_get_z(z.value, self.value, MPFR_RNDZ)
@@ -3352,7 +3352,7 @@ cdef class RealNumber(sage.structure.element.RingElement):
         # as subject-to-change.
 
         if mpfr_nan_p(self.value) or mpfr_inf_p(self.value):
-            raise ValueError('Cannot convert NaN or infinity to Pari float')
+            raise ValueError('cannot convert NaN or infinity to Pari float')
 
         # wordsize for PARI
         cdef unsigned long wordsize = sizeof(long)*8
@@ -3678,14 +3678,14 @@ cdef class RealNumber(sage.structure.element.RingElement):
             sage: RR('nan').simplest_rational()
             Traceback (most recent call last):
             ...
-            ValueError: Cannot convert NaN or infinity to rational number
+            ValueError: cannot convert NaN or infinity to rational number
             sage: RR('-infinity').simplest_rational()
             Traceback (most recent call last):
             ...
-            ValueError: Cannot convert NaN or infinity to rational number
+            ValueError: cannot convert NaN or infinity to rational number
         """
         if not mpfr_number_p(self.value):
-            raise ValueError('Cannot convert NaN or infinity to rational number')
+            raise ValueError('cannot convert NaN or infinity to rational number')
 
         if mpfr_zero_p(self.value):
             return Rational(0)
@@ -3784,23 +3784,23 @@ cdef class RealNumber(sage.structure.element.RingElement):
             sage: RR('nan').nearby_rational(max_denominator=1000)
             Traceback (most recent call last):
             ...
-            ValueError: Cannot convert NaN or infinity to rational number
+            ValueError: cannot convert NaN or infinity to rational number
             sage: RR('nan').nearby_rational(max_error=0.01)
             Traceback (most recent call last):
             ...
-            ValueError: Cannot convert NaN or infinity to rational number
+            ValueError: cannot convert NaN or infinity to rational number
             sage: RR(oo).nearby_rational(max_denominator=1000)
             Traceback (most recent call last):
             ...
-            ValueError: Cannot convert NaN or infinity to rational number
+            ValueError: cannot convert NaN or infinity to rational number
             sage: RR(oo).nearby_rational(max_error=0.01)
             Traceback (most recent call last):
             ...
-            ValueError: Cannot convert NaN or infinity to rational number
+            ValueError: cannot convert NaN or infinity to rational number
         """
 
         if not mpfr_number_p(self.value):
-            raise ValueError('Cannot convert NaN or infinity to rational number')
+            raise ValueError('cannot convert NaN or infinity to rational number')
 
         if ((max_error is None and max_denominator is None) or
             (max_error is not None and max_denominator is not None)):
@@ -6105,7 +6105,7 @@ def create_RealField(*args, **kwds):
         See http://trac.sagemath.org/24511 for details.
         Real Field with 53 bits of precision
     """
-    #deprecation has already been imported in this file
+    # deprecation has already been imported in this file
     deprecation(24511, "Please import create_RealField from sage.rings.real_field")
     from sage.rings.real_field import create_RealField as cr
     return cr(*args, **kwds)

src/sage/rings/universal_cyclotomic_field.py

@@ -561,7 +561,7 @@ def to_cyclotomic_field(self, R=None):
             sage: CF(E(5)) # indirect doctest
             Traceback (most recent call last):
             ...
-            TypeError: Cannot coerce zeta5 into Cyclotomic Field of order 7 and
+            TypeError: cannot coerce zeta5 into Cyclotomic Field of order 7 and
             degree 6
 
             sage: CF = CyclotomicField(10)

src/sage/schemes/generic/ambient_space.py

@@ -379,7 +379,7 @@ def dimension_absolute(self):
         base = self.base_scheme()
         if base.is_noetherian():
             return self.dimension_relative() + base.dimension()
-        raise NotImplementedError("Cannot compute the dimension of this scheme.")
+        raise NotImplementedError("cannot compute the dimension of this scheme")
 
     dimension = dimension_absolute
 

src/sage/structure/coerce_maps.pyx

@@ -282,7 +282,7 @@ cdef class NamedConvertMap(Map):
                 print(type(x), x)
                 print(type(C), C)
                 print(self.method_name)
-            raise TypeError("Cannot coerce {} to {}".format(x, C))
+            raise TypeError(f"cannot coerce {x} to {C}")
         cdef Map m
         cdef Element e = method(C)
         if e is None: