Minor fixes

Author: jdemeyer

src/sage/coding/linear_code.py

@@ -3554,7 +3554,6 @@ def weight_enumerator(self, names=None, name2=None, bivariate=True):
             s^7 + 7*s^4*t^3 + 7*s^3*t^4 + t^7
             sage: C.weight_enumerator(names="var1, var2")
             var1^7 + 7*var1^4*var2^3 + 7*var1^3*var2^4 + var2^7
-            sage: (var1, var2) = var('var1, var2')
             sage: C.weight_enumerator(names=('var1', 'var2'))
             var1^7 + 7*var1^4*var2^3 + 7*var1^3*var2^4 + var2^7
             sage: C.weight_enumerator(bivariate=False)

src/sage/matrix/matrix2.pyx

@@ -10982,9 +10982,6 @@ cdef class Matrix(Matrix1):
             True
             sage: p, S = A.cyclic_subspace(v, var='T'); p
             T^3 - 9*T^2 + 24*T - 16
-            sage: gen = polygen(QQ, 'z')
-            sage: p, S = A.cyclic_subspace(v, var='z'); p
-            z^3 - 9*z^2 + 24*z - 16
             sage: p.degree() == E.dimension()
             True
 

src/sage/rings/polynomial/polynomial_element.pyx

@@ -6654,7 +6654,8 @@ cdef class Polynomial(CommutativeAlgebraElement):
 
         The following examples show that :trac:`11782` has been fixed::
 
-            sage: x = var('x')
+            sage: var('x')
+            x
             sage: ZZ.quo(81)['x'](3*x^2 + 3*x + 3).discriminant()
             54
             sage: ZZ.quo(9)['x'](2*x^3 + x^2 + x).discriminant()

src/sage/rings/quotient_ring.py

@@ -187,7 +187,7 @@ def QuotientRing(R, I, names=None):
     ::
 
         sage: P.<x> = QQ[]
-        sage: S.<xbar> = QuotientRing(P, P.ideal(x^2 - 2))
+        sage: S = QuotientRing(P, P.ideal(x^2 - 2))
         sage: S
         Univariate Quotient Polynomial Ring in xbar over Rational Field with
         modulus x^2 - 2
@@ -201,7 +201,7 @@ def QuotientRing(R, I, names=None):
     Sage coerces objects into ideals when possible::
 
         sage: P.<x> = QQ[]
-        sage: R.<xbar> = QuotientRing(P, x^2 + 1); R
+        sage: R = QuotientRing(P, x^2 + 1); R
         Univariate Quotient Polynomial Ring in xbar over Rational Field with
         modulus x^2 + 1
 

src/sage/rings/ring.pyx

@@ -983,7 +983,8 @@ cdef class Ring(ParentWithGens):
 
         Make sure :trac:`10481` is fixed::
 
-            sage: x = var('x')
+            sage: var('x')
+            x
             sage: R.<a> = ZZ['x'].quo(x^2)
             sage: R.fraction_field()
             Traceback (most recent call last):