simplify many range(0,n) to range(n)

src/sage/calculus/desolvers.py

@@ -741,7 +741,7 @@ def desolve_laplace(de, dvar, ics=None, ivar=None):
     # maxima("de:"+de._repr_()+"=0;")
     # if ics is not None:
     #     d = len(ics)
-    #     for i in range(0,d-1):
+    #     for i in range(d-1):
     #         ic = "atvalue(diff("+vars[1]+"("+vars[0]+"),"+str(vars[0])+","+str(i)+"),"+str(vars[0])+"="+str(ics[0])+","+str(ics[1+i])+")"
     #         maxima(ic)
     #

src/sage/coding/grs_code.py

@@ -1525,7 +1525,7 @@ def _polynomial_vanishing_at_alphas(self, PolRing):
         """
         G = PolRing.one()
         x = PolRing.gen()
-        for i in range(0, self.code().length()):
+        for i in range(self.code().length()):
             G = G*(x-self.code().evaluation_points()[i])
         return G
 
@@ -1612,11 +1612,10 @@ def _decode_to_code_and_message(self, r):
         if n == C.dimension() or r in C:
             return r, self.connected_encoder().unencode_nocheck(r)
 
-        points = [(alphas[i], r[i]/col_mults[i]) for i in
-                range(0, n)]
+        points = [(alphas[i], r[i]/col_mults[i]) for i in range(n)]
         R = PolRing.lagrange_polynomial(points)
 
-        (Q1, Q0) = self._partial_xgcd(G, R, PolRing)
+        Q1, Q0 = self._partial_xgcd(G, R, PolRing)
 
         h, rem = Q1.quo_rem(Q0)
         if not rem.is_zero():

src/sage/coding/guruswami_sudan/gs_decoder.py

@@ -849,15 +849,15 @@ def decode_to_code(self, r):
         s = self.multiplicity()
         l = self.list_size()
         tau = self.decoding_radius()
-        ## SETUP INTERPOLATION PROBLEM
+        # SETUP INTERPOLATION PROBLEM
         wy = k-1
-        points = [(alphas[i], r[i]/colmults[i]) for i in range(0,len(alphas))]
-        ## SOLVE INTERPOLATION
+        points = [(alphas[i], r[i]/colmults[i]) for i in range(len(alphas))]
+        # SOLVE INTERPOLATION
         try:
             Q = self.interpolation_algorithm()(points, tau, (s,l), wy)
         except TypeError:
             raise ValueError("The provided interpolation algorithm has a wrong signature. See the documentation of `codes.decoders.GRSGuruswamiSudanDecoder.interpolation_algorithm()` for details")
-        ## EXAMINE THE FACTORS AND CONVERT TO CODEWORDS
+        # EXAMINE THE FACTORS AND CONVERT TO CODEWORDS
         try:
             polynomials = self.rootfinding_algorithm()(Q, maxd=wy)
         except TypeError:

src/sage/coding/guruswami_sudan/interpolation.py

@@ -342,14 +342,15 @@ def lee_osullivan_module(points, parameters, wy):
     PF = F['x']
     x = PF.gens()[0]
     R = PF.lagrange_polynomial(points)
-    G = prod(x - points[i][0] for i in range(0, len(points)))
+    G = prod(x - points[i][0] for i in range(len(points)))
     PFy = PF['y']
     y = PFy.gens()[0]
-    ybasis = [(y-R)**i * G**(s-i) for i in range(0, s+1)] \
-            + [y**(i-s) * (y-R)**s for i in range(s+1, l+1)]
+    ybasis = [(y-R)**i * G**(s-i) for i in range(s + 1)] \
+            + [y**(i-s) * (y-R)**s for i in range(s + 1, l + 1)]
 
     def pad(lst):
         return lst + [0]*(l+1-len(lst))
+
     modbasis = [pad(yb.coefficients(sparse=False)) for yb in ybasis]
     return matrix(PF, modbasis)
 

src/sage/crypto/mq/sr.py

@@ -2248,8 +2248,8 @@ def shift_rows_matrix(self):
         bs = r*c*e
         shift_rows = matrix(k, bs, bs)
         I = MatrixSpace(k, e, e)(1)
-        for x in range(0, c):
-            for y in range(0, r):
+        for x in range(c):
+            for y in range(r):
                 _r = ((x*r)+y) * e
                 _c = (((x*r)+((r+1)*y)) * e) % bs
                 self._insert_matrix_into_matrix(shift_rows, I, _r, _c)
@@ -2290,14 +2290,14 @@ def lin_matrix(self, length=None):
         if e == 4:
             l = [k.from_integer(x) for x in (5, 1, 12, 5)]
             for k in range( 0, length ):
-                for i in range(0, 4):
-                    for j in range(0, 4):
+                for i in range(4):
+                    for j in range(4):
                         lin[k*4+j, k*4+i] = l[(i-j) % 4] ** (2**j)
         elif e == 8:
             l = [k.from_integer(x) for x in (5, 9, 249, 37, 244, 1, 181, 143)]
             for k in range( 0, length ):
-                for i in range(0, 8):
-                    for j in range(0, 8):
+                for i in range(8):
+                    for j in range(8):
                         lin[k*8+j, k*8+i] = l[(i-j) % 8] ** (2**j)
 
         return lin
@@ -2651,8 +2651,8 @@ def shift_rows_matrix(self):
         k = self.k
         bs = r*c
         shift_rows = matrix(k, r*c, r*c)
-        for x in range(0, c):
-            for y in range(0, r):
+        for x in range(c):
+            for y in range(r):
                 _r = ((x*r)+y)
                 _c = ((x*r)+((r+1)*y)) % bs
                 shift_rows[_r, _c] = 1

src/sage/data_structures/stream.py

@@ -3247,7 +3247,7 @@ def __init__(self, series, shift, minimal_valuation):
         true order at initialization::
 
             sage: f = Stream_function(fun, True, 0)
-            sage: [f[i] for i in range(0, 10)]
+            sage: [f[i] for i in range(10)]
             [0, 1, 1, 0, 1, 0, 0, 0, 1, 0]
             sage: f._cache
             {1: 1, 2: 1, 3: 0, 4: 1, 5: 0, 6: 0, 7: 0, 8: 1, 9: 0}
@@ -3257,7 +3257,7 @@ def __init__(self, series, shift, minimal_valuation):
             sage: s._approximate_order
             3
             sage: f = Stream_function(fun, False, 0)
-            sage: [f[i] for i in range(0, 10)]
+            sage: [f[i] for i in range(10)]
             [0, 1, 1, 0, 1, 0, 0, 0, 1, 0]
             sage: f._cache
             [1, 1, 0, 1, 0, 0, 0, 1, 0]
@@ -3432,7 +3432,7 @@ def is_nonzero(self):
             sage: from sage.data_structures.stream import Stream_function, Stream_truncated
             sage: def fun(n): return 1 if ZZ(n).is_power_of(2) else 0
             sage: f = Stream_function(fun, False, 0)
-            sage: [f[i] for i in range(0, 4)]
+            sage: [f[i] for i in range(4)]
             [0, 1, 1, 0]
             sage: f._cache
             [1, 1, 0]
@@ -3445,7 +3445,7 @@ def is_nonzero(self):
             True
 
             sage: f = Stream_function(fun, True, 0)
-            sage: [f[i] for i in range(0, 4)]
+            sage: [f[i] for i in range(4)]
             [0, 1, 1, 0]
             sage: f._cache
             {1: 1, 2: 1, 3: 0}

src/sage/dynamics/arithmetic_dynamics/affine_ds.py

@@ -800,7 +800,7 @@ def multiplier(self, P, n, check=True):
         l = identity_matrix(FractionField(self.codomain().base_ring()), N, N)
         Q = P
         J = self.jacobian()
-        for i in range(0, n):
+        for i in range(n):
             R = self(Q)
             l = J(tuple(Q)) * l  # chain rule matrix multiplication
             Q = R

src/sage/dynamics/arithmetic_dynamics/endPN_minimal_model.py

@@ -66,12 +66,13 @@ def bCheck(c, v, p, b):
         sage: bCheck(11664*b^2 + 70227*b + 76059, 15/2, 3, b)
         -1
     """
-    val = (v+1).floor()
+    val = (v + 1).floor()
     deg = c.degree()
     coeffs = c.coefficients(sparse=False)
     lcoeff = coeffs[deg]
     coeffs.remove(lcoeff)
-    check1 = [(coeffs[i].valuation(p) - lcoeff.valuation(p))/(deg - i) for i in range(0,len(coeffs)) if coeffs[i] != 0]
+    check1 = [(coeffs[i].valuation(p) - lcoeff.valuation(p))/(deg - i)
+              for i in range(len(coeffs)) if coeffs[i] != 0]
     check2 = (val - lcoeff.valuation(p))/deg
     check1.append(check2)
     bval = min(check1)

src/sage/dynamics/arithmetic_dynamics/wehlerK3.py

@@ -1200,7 +1200,7 @@ def sigmaX(self, P, **kwds):
         e = min(maxexp)
 
         #Fix L and Q
-        for i in range(0,2):
+        for i in range(2):
             while T[i].subs({w1:t1}) == 0:
                 T[i] = T[i]/t
             T[i] = T[i].subs({w1:t1})
@@ -1435,7 +1435,8 @@ def sigmaY(self, P, **kwds):
         -phi(self.Hpoly(0, 1, 2))]
         maxexp = []
 
-        #Find highest exponent that we can divide out by to get a nonzero answer
+        # Find highest exponent that we can divide out by to get a
+        # nonzero answer
         for i in range(2, len(T)):
             e = 0
             while (T[i]/t**e).subs({w1:t1}) == 0:
@@ -1444,7 +1445,7 @@ def sigmaY(self, P, **kwds):
 
         e = min(maxexp)
 
-        for i in range(0, 2):
+        for i in range(2):
             while T[i].subs({w1:t1}) == 0:
                 T[i] = T[i]/t
             T[i] = T[i].subs({w1:t1})

src/sage/geometry/hyperplane_arrangement/library.py

@@ -502,7 +502,8 @@ def Ish(self, n, K=QQ, names=None):
         A = H(*hyperplanes)
         x = polygen(QQ, 'x')
         charpoly = x * sum([(-1)**k * stirling_number2(n, n-k) *
-                            prod([(x - 1 - j) for j in range(k, n-1)]) for k in range(0, n)])
+                            prod([(x - 1 - j) for j in range(k, n-1)])
+                            for k in range(n)])
         A.characteristic_polynomial.set_cache(charpoly)
         return A
 

src/sage/geometry/polyhedral_complex.py

@@ -412,7 +412,7 @@ def cell_iterator(self, increasing=True):
             11
         """
         cells = self.cells()
-        dim_index = range(0, self.dimension() + 1)
+        dim_index = range(self.dimension() + 1)
         if not increasing:
             dim_index = reversed(dim_index)
         for d in dim_index:

src/sage/geometry/riemannian_manifolds/parametrized_surface3d.py

@@ -276,11 +276,11 @@ class ParametrizedSurface3D(SageObject):
         sage: cc_array = [(ccc - K_min)/(K_max - K_min) for ccc in K_array]
         sage: points_array = [ellipsoid_equation(u_array[counter][0],
         ....:                                    u_array[counter][1])
-        ....:                 for counter in range(0,len(u_array))]
+        ....:                 for counter in range(len(u_array))]
         sage: curvature_ellipsoid_plot = sum(point([xx                                  # needs sage.plot
         ....:                                       for xx in points_array[counter]],
         ....:                                      color=hue(cc_array[counter]/2))
-        ....:                                for counter in range(0,len(u_array)))
+        ....:                                for counter in range(len(u_array)))
         sage: curvature_ellipsoid_plot.show(aspect_ratio=1)                             # needs sage.plot
 
     We can find the principal curvatures and principal directions of the

src/sage/geometry/triangulation/base.pyx

@@ -595,13 +595,13 @@ cdef class PointConfiguration_base(Parent):
         EXAMPLES::
 
             sage: p = PointConfiguration([[1,0], [2,3], [3,2]])
-            sage: [ p[i] for i in range(0,p.n_points()) ]
+            sage: [p[i] for i in range(p.n_points())]
             [P(1, 0), P(2, 3), P(3, 2)]
             sage: list(p)
             [P(1, 0), P(2, 3), P(3, 2)]
             sage: list(p.points())
             [P(1, 0), P(2, 3), P(3, 2)]
-            sage: [ p.point(i) for i in range(0,p.n_points()) ]
+            sage: [p.point(i) for i in range(p.n_points())]
             [P(1, 0), P(2, 3), P(3, 2)]
         """
         return self._pts[i]

src/sage/interfaces/phc.py

@@ -567,7 +567,7 @@
                         t_val = CC(m.group(2), m.group(3))
                         temp_dict = {}
                         temp_dict["t"] = t_val
-                        for i in range(0, count):
+                        for i in range(count):
                             a_line = fh.readline()
                             m = sols_regex.match(a_line)
                             if m:

src/sage/interfaces/r.py

@@ -894,7 +894,7 @@ def available_packages(self):
         # The following was more structural, but breaks on my machine.  (stein)
         # p = p._sage_()
         # s = p['_Dim'][0]
-        # l = [[p['DATA'][i],p['DATA'][s+1+i]] for i in range(0,s)]
+        # l = [[p['DATA'][i],p['DATA'][s+1+i]] for i in range(s)]
         # return l
 
     def _object_class(self):

src/sage/knots/knot.py

@@ -292,7 +292,7 @@ def dt_code(self):
                     crossing = i
                     break
             if not string_found:
-                for i in range(0, crossing):
+                for i in range(crossing):
                     if abs(b[i]) == string or abs(b[i]) == string - 1:
                         string_found = True
                         crossing = i

src/sage/libs/mpmath/ext_impl.pyx

@@ -2116,7 +2116,7 @@ cdef MPF_hypsum(MPF *a, MPF *b, int p, int q, param_types, str ztype, coeffs, z,
             raise ZeroDivisionError
 
         # Multiply real factors
-        for k in range(0, cancellable_real):
+        for k in range(cancellable_real):
             sig_check()
             mpz_mul(PRE, PRE, AREAL[k])
             mpz_fdiv_q(PRE, PRE, BREAL[k])
@@ -2129,7 +2129,7 @@ cdef MPF_hypsum(MPF *a, MPF *b, int p, int q, param_types, str ztype, coeffs, z,
             mpz_mul_2exp(PRE, PRE, wp)
             mpz_fdiv_q(PRE, PRE, BREAL[k])
         if have_complex:
-            for k in range(0, cancellable_real):
+            for k in range(cancellable_real):
                 sig_check()
                 mpz_mul(PIM, PIM, AREAL[k])
                 mpz_fdiv_q(PIM, PIM, BREAL[k])

src/sage/schemes/elliptic_curves/ell_point.py

@@ -4604,8 +4604,8 @@ def padic_elliptic_logarithm(self, Q, p):
         if Q.is_zero():
             k = 0
         else:
-            for k in range(0,p):
-                Eqp = EllipticCurve(Qp(p, 2), [ ZZ(t) + k * p for t in E.a_invariants() ])
+            for k in range(p):
+                Eqp = EllipticCurve(Qp(p, 2), [ZZ(t) + k * p for t in E.a_invariants()])
 
                 P_Qps = Eqp.lift_x(ZZ(self.x()), all=True)
                 for P_Qp in P_Qps:

src/sage/structure/global_options.py

@@ -130,7 +130,7 @@
     ....:                                  cake='waist begins again',
     ....:                                  cream='fluffy, white stuff'))
     ....:         tip = dict(default=10, description='Reward for good service',
-    ....:                    checker = lambda tip: tip in range(0,20))
+    ....:                    checker = lambda tip: tip in range(20))
     sage: Menu.options
     Current options for menu
       - dessert: espresso
@@ -409,7 +409,7 @@ class options(GlobalOptions):
     ....:                                  cake='waist begins again',
     ....:                                  cream='fluffy, white stuff')),
     ....:         tip=dict(default=10, description='Reward for good service',
-    ....:         checker=lambda tip: tip in range(0,20))
+    ....:         checker=lambda tip: tip in range(20))
     ....:     )
     sage: Menu.options
     Current options for menu
@@ -908,7 +908,7 @@ class GlobalOptions(metaclass=GlobalOptionsMeta):
         ....:                                  cake='waist begins again',
         ....:                                  cream='fluffy white stuff'))
         ....:         tip = dict(default=10, description='Reward for good service',
-        ....:                  checker=lambda tip: tip in range(0,20))
+        ....:                  checker=lambda tip: tip in range(20))
         sage: Menu.options
         Current options for menu
           - dessert: espresso
@@ -1013,7 +1013,7 @@ def __init__(self, NAME=None, module='', option_class='', doc='', end_doc='', **
             ....:                              cake='waist begins again',
             ....:                              cream='fluffy white stuff'))
             ....:     tip = dict(default=10, description='Reward for good service',
-            ....:              checker=lambda tip: tip in range(0,20))
+            ....:              checker=lambda tip: tip in range(20))
             sage: menu._name  # Default name is class name
             'menu'
             sage: class specials(GlobalOptions):

src/sage/tensor/modules/free_module_tensor.py

@@ -2801,12 +2801,12 @@ def contract(self, *args):
         #
         nb_cov_s = 0  # Number of covariant indices of self not involved in the
                       # contraction
-        for pos in range(k1,k1+l1):
+        for pos in range(k1, k1 + l1):
             if pos not in pos1:
                 nb_cov_s += 1
         nb_con_o = 0  # Number of contravariant indices of other not involved
                       # in the contraction
-        for pos in range(0,k2):
+        for pos in range(k2):
             if pos not in pos2:
                 nb_con_o += 1
         if nb_cov_s != 0 and nb_con_o != 0:

src/sage/topology/delta_complex.py

@@ -304,7 +304,7 @@ def store_bdry(simplex, faces):
                     # else a dictionary indexed by simplices
                     dimension = max([f.dimension() for f in data])
                     old_data_by_dim = {}
-                    for dim in range(0, dimension+1):
+                    for dim in range(dimension + 1):
                         old_data_by_dim[dim] = []
                         new_data[dim] = []
                     for x in data:
@@ -466,7 +466,7 @@ def subcomplex(self, data):
                         new_dict[d+1].append(tuple([translate[n] for n in f]))
                 new_dict[d].append(cells[d][x])
                 cells_to_add.update(cells[d][x])
-        new_cells = [new_dict[n] for n in range(0, max_dim+1)]
+        new_cells = [new_dict[n] for n in range(max_dim + 1)]
         sub = DeltaComplex(new_cells)
         sub._is_subcomplex_of = {self: new_data}
         return sub
@@ -564,7 +564,7 @@ def cells(self, subcomplex=None):
                 raise ValueError("this is not a subcomplex of self")
         else:
             subcomplex_cells = subcomplex._is_subcomplex_of[self]
-            for d in range(0, max(subcomplex_cells.keys())+1):
+            for d in range(max(subcomplex_cells.keys()) + 1):
                 L = list(cells[d])
                 for c in subcomplex_cells[d]:
                     L[c] = None
@@ -1303,7 +1303,7 @@ def elementary_subdivision(self, idx=-1):
         # added_cells: dict indexed by (n-1)-cells, with value the
         # corresponding new n-cell.
         added_cells = {(): len(cells_dict[0])-1}
-        for n in range(0, dim):
+        for n in range(dim):
             new_cells = {}
             # for each n-cell in the standard simplex, add an
             # (n+1)-cell to the subdivided complex.