Merge branch 'public/ticket/26403' in 9.0.b1

src/sage/algebras/letterplace/free_algebra_element_letterplace.pyx

@@ -15,7 +15,6 @@ AUTHOR:
 - Simon King (2011-03-23): Trac ticket :trac:`7797`
 
 """
-from __future__ import print_function
 
 from sage.libs.singular.function import lib, singular_function
 from sage.misc.misc import repr_lincomb

src/sage/algebras/quatalg/quaternion_algebra_cython.pyx

@@ -20,7 +20,6 @@ AUTHORS:
 # (at your option) any later version.
 #                  http://www.gnu.org/licenses/
 #*****************************************************************************
-from __future__ import absolute_import
 
 from sage.rings.integer_ring import ZZ
 from sage.rings.rational_field import QQ

src/sage/arith/multi_modular.pyx

@@ -11,7 +11,6 @@ Utility classes for multi-modular algorithms
 # (at your option) any later version.
 #                  http://www.gnu.org/licenses/
 #*****************************************************************************
-from __future__ import absolute_import
 
 from cysignals.memory cimport check_allocarray, check_reallocarray, sig_free
 

src/sage/arith/srange.pyx

@@ -1,3 +1,4 @@
+# cython: language_level=2
 """
 Ranges and the ``[1,2,..,n]`` notation
 

src/sage/calculus/integration.pyx

@@ -25,7 +25,6 @@ AUTHORS:
 #  the License, or (at your option) any later version.
 #                  http://www.gnu.org/licenses/
 #*****************************************************************************
-from __future__ import print_function, absolute_import
 
 from cysignals.signals cimport sig_on, sig_off
 from sage.rings.real_double import RDF

src/sage/calculus/interpolators.pyx

@@ -22,7 +22,6 @@ Development supported by NSF award No. 0702939.
 #
 #                  http://www.gnu.org/licenses/
 #*****************************************************************************
-from __future__ import absolute_import
 
 import numpy as np
 cimport numpy as np

src/sage/calculus/ode.pyx

@@ -18,7 +18,6 @@ AUTHORS:
 # (at your option) any later version.
 #                  http://www.gnu.org/licenses/
 #*****************************************************************************
-from __future__ import absolute_import
 
 from cysignals.memory cimport sig_malloc, sig_free
 from cysignals.signals cimport sig_on, sig_off

src/sage/calculus/riemann.pyx

@@ -24,7 +24,6 @@ Development supported by NSF award No. 0702939.
 #
 #                  http://www.gnu.org/licenses/
 #*****************************************************************************
-from __future__ import print_function, absolute_import
 
 from cysignals.signals cimport sig_on, sig_off
 

src/sage/calculus/transforms/dwt.pyx

@@ -20,7 +20,6 @@ AUTHOR:
 # (at your option) any later version.
 #                  http://www.gnu.org/licenses/
 #*****************************************************************************
-from __future__ import absolute_import
 
 import sage.plot.all
 

src/sage/calculus/transforms/fft.pyx

@@ -19,7 +19,6 @@ AUTHORS:
 # (at your option) any later version.
 #                  http://www.gnu.org/licenses/
 #*****************************************************************************
-from __future__ import absolute_import
 
 from cysignals.memory cimport sig_malloc, sig_free
 

src/sage/categories/action.pyx

@@ -53,8 +53,6 @@ AUTHOR:
 #                  http://www.gnu.org/licenses/
 #*****************************************************************************
 
-from __future__ import absolute_import
-
 from cpython.tuple cimport PyTuple_GET_ITEM
 
 from .functor cimport Functor

src/sage/categories/coercion_methods.pyx

@@ -5,8 +5,6 @@ The purpose of this Cython module is to hold special coercion methods,
 which are inserted by their respective categories.
 """
 
-from __future__ import absolute_import, division, print_function
-
 from sage.structure.element cimport Element
 cimport cython
 

src/sage/categories/functor.pyx

@@ -32,7 +32,6 @@ AUTHORS:
 #
 #                  https://www.gnu.org/licenses/
 # ****************************************************************************
-from __future__ import absolute_import
 
 from . import category
 

src/sage/categories/map.pyx

@@ -22,8 +22,6 @@ AUTHORS:
 #                  http://www.gnu.org/licenses/
 #*****************************************************************************
 
-from __future__ import absolute_import, print_function
-
 from . import homset
 import weakref
 from sage.ext.stdsage cimport HAS_DICTIONARY

src/sage/categories/morphism.pyx

@@ -19,7 +19,6 @@ AUTHORS:
 # (at your option) any later version.
 #                  http://www.gnu.org/licenses/
 #*****************************************************************************
-from __future__ import print_function, absolute_import
 
 from cpython.object cimport *
 from sage.misc.constant_function import ConstantFunction

src/sage/coding/binary_code.pyx

@@ -40,8 +40,6 @@ AUTHOR:
 #                  http://www.gnu.org/licenses/
 #*****************************************************************************
 
-from __future__ import absolute_import, print_function
-
 from libc.string cimport memcpy
 from cpython.mem cimport *
 from cpython.object cimport PyObject_RichCompare

src/sage/coding/codecan/codecan.pyx

@@ -91,7 +91,6 @@ is returned by generators::
 #  the License, or (at your option) any later version.
 #                  http://www.gnu.org/licenses/
 #*******************************************************************************
-from __future__ import absolute_import
 
 from copy import copy
 from cysignals.memory cimport check_allocarray, sig_free

src/sage/combinat/crystals/pbw_datum.pyx

@@ -21,7 +21,6 @@ AUTHORS:
 # (at your option) any later version.
 #                  https://www.gnu.org/licenses/
 # ****************************************************************************
-from __future__ import absolute_import
 
 #from sage.misc.lazy_attribute import lazy_attribute
 from sage.misc.cachefunc import cached_method

src/sage/combinat/crystals/spins.pyx

@@ -41,7 +41,6 @@ representing the elements of the spin crystal by sequences of signs
 #
 #                  http://www.gnu.org/licenses/
 #****************************************************************************
-from __future__ import print_function
 
 from cpython.object cimport Py_EQ, Py_NE, Py_LE, Py_GE, Py_LT, Py_GT
 from cysignals.memory cimport sig_malloc, sig_free

src/sage/combinat/crystals/tensor_product_element.pyx

@@ -29,7 +29,6 @@ AUTHORS:
 #
 #                  https://www.gnu.org/licenses/
 #****************************************************************************
-from __future__ import print_function, absolute_import
 
 from cpython.object cimport Py_LT, Py_LE, Py_EQ, Py_NE, Py_GT, Py_GE
 from sage.structure.parent cimport Parent

src/sage/combinat/designs/designs_pyx.pyx

@@ -6,7 +6,6 @@ This module implements the design methods that need to be somewhat efficient.
 Functions
 ---------
 """
-from __future__ import print_function, absolute_import, division
 
 include "sage/data_structures/bitset.pxi"
 

src/sage/combinat/designs/evenly_distributed_sets.pyx

@@ -15,7 +15,6 @@ might want to update this database with more values.
 Classes and methods
 -------------------
 """
-from __future__ import print_function, absolute_import
 
 cimport cython
 

src/sage/combinat/designs/orthogonal_arrays_find_recursive.pyx

@@ -44,7 +44,6 @@ REFERENCES:
 Functions
 ---------
 """
-from __future__ import print_function, absolute_import
 
 from sage.misc.cachefunc import cached_function
 from .orthogonal_arrays import orthogonal_array

src/sage/combinat/integer_lists/invlex.pyx

@@ -28,8 +28,6 @@ limitations and lack of robustness w.r.t. input.
 #                  https://www.gnu.org/licenses/
 # ****************************************************************************
 
-from __future__ import print_function, absolute_import
-
 import builtins
 
 from sage.misc.classcall_metaclass import ClasscallMetaclass, typecall

src/sage/combinat/matrices/dancing_links.pyx

@@ -77,7 +77,6 @@ There is also a method ``reinitialize`` to reinitialize the algorithm::
 # (at your option) any later version.
 #                  http://www.gnu.org/licenses/
 #*****************************************************************************
-from __future__ import print_function
 
 from cpython.object cimport PyObject_RichCompare
 from libcpp.vector cimport vector

src/sage/combinat/partitions.pyx

@@ -23,7 +23,6 @@ AUTHOR:
 # (at your option) any later version.
 #                  http://www.gnu.org/licenses/
 #*****************************************************************************
-from __future__ import print_function, absolute_import
 
 import sys
 

src/sage/combinat/permutation_cython.pyx

@@ -33,8 +33,6 @@ speed, we provide a class that wraps our struct.
 #                  http://www.gnu.org/licenses/
 #*****************************************************************************
 
-from __future__ import print_function
-
 cimport cython
 
 from cpython.object cimport PyObject

src/sage/combinat/root_system/reflection_group_element.pyx

@@ -22,8 +22,6 @@ AUTHORS:
 #                  http://www.gnu.org/licenses/
 #*****************************************************************************
 
-from __future__ import absolute_import, print_function
-
 from sage.misc.cachefunc import cached_method
 from sage.misc.lazy_attribute import lazy_attribute
 from sage.misc.misc_c import prod

src/sage/combinat/words/word_char.pyx

@@ -10,7 +10,6 @@ Fast word datatype using an array of unsigned char
 # (at your option) any later version.
 #                  http://www.gnu.org/licenses/
 #*****************************************************************************
-from __future__ import print_function, absolute_import
 
 from cysignals.memory cimport check_allocarray, sig_free
 from cysignals.signals cimport sig_on, sig_off

src/sage/combinat/words/word_datatypes.pyx

@@ -11,7 +11,6 @@ Datatypes for finite words
 # (at your option) any later version.
 #                  http://www.gnu.org/licenses/
 #*****************************************************************************
-from __future__ import print_function, absolute_import
 
 from cpython.object cimport Py_EQ, Py_NE
 from itertools import islice

src/sage/cpython/atexit.pyx

@@ -12,9 +12,6 @@
 #                  http://www.gnu.org/licenses/
 #*****************************************************************************
 
-from __future__ import absolute_import
-
-
 import atexit
 
 

src/sage/cpython/dict_del_by_value.pyx

@@ -16,25 +16,23 @@ AUTHORS:
 - Nils Bruin (2017-05)
 """
 
-#*****************************************************************************
+# ****************************************************************************
 #       Copyright (C) 2017 Nils Bruin <nbruin@sfu.ca>
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
 # the Free Software Foundation, either version 2 of the License, or
 # (at your option) any later version.
 #                  https://www.gnu.org/licenses/
-#*****************************************************************************
-
-from __future__ import print_function, absolute_import
+# ****************************************************************************
 
 import weakref
 from weakref import KeyedRef
 
 from cpython.list cimport PyList_New
 from cpython cimport Py_XINCREF, Py_XDECREF
 
-IF PY_VERSION_HEX<=0x02ffffff:
+IF PY_VERSION_HEX <= 0x02ffffff:
     cdef extern from "Python.h":
         ctypedef struct PyDictEntry:
             Py_ssize_t me_hash

src/sage/cpython/string.pyx

@@ -23,8 +23,6 @@ Check that this can be used outside of Sage (see :trac:`25549`)::
 #                  http://www.gnu.org/licenses/
 #*****************************************************************************
 
-from __future__ import absolute_import
-
 import sys
 
 

src/sage/crypto/boolean_function.pyx

@@ -28,7 +28,6 @@ AUTHOR:
 - Yann Laigle-Chapuy (2009-08-28): first implementation
 
 """
-from __future__ import absolute_import
 
 from cysignals.signals cimport sig_check
 from libc.string cimport memcpy

src/sage/data_structures/bitset.pyx

@@ -30,7 +30,6 @@ linear in ``capacity``.
 #
 #                  http://www.gnu.org/licenses/
 #*****************************************************************************
-from __future__ import print_function
 
 include "bitset.pxi"
 from cpython.object cimport Py_LT, Py_LE, Py_EQ, Py_NE, Py_GT, Py_GE

src/sage/data_structures/bounded_integer_sequences.pyx

@@ -106,7 +106,6 @@ AUTHORS:
 #  the License, or (at your option) any later version.
 #                  https://www.gnu.org/licenses/
 # ****************************************************************************
-from __future__ import print_function, absolute_import
 
 from cysignals.signals cimport sig_check, sig_on, sig_off
 include 'sage/data_structures/bitset.pxi'

src/sage/dynamics/complex_dynamics/mandel_julia_helper.pyx

@@ -20,7 +20,6 @@ AUTHORS:
 #                  http://www.gnu.org/licenses/
 #*****************************************************************************
 
-from __future__ import absolute_import, division
 from sage.plot.colors import Color
 from sage.repl.image import Image
 from copy import copy

src/sage/ext/fast_callable.pyx

@@ -299,7 +299,6 @@ AUTHOR:
 #
 #                  http://www.gnu.org/licenses/
 #*****************************************************************************
-from __future__ import absolute_import
 
 import operator
 from copy import copy

src/sage/ext/fast_eval.pyx

@@ -86,7 +86,6 @@ AUTHORS:
 # (at your option) any later version.
 #                  http://www.gnu.org/licenses/
 #*****************************************************************************
-from __future__ import absolute_import
 
 from cysignals.memory cimport sig_malloc, sig_free
 

src/sage/finance/fractal.pyx

@@ -20,7 +20,6 @@ AUTHOR:
 
 - William Stein (2008)
 """
-from __future__ import absolute_import
 
 from sage.rings.all import RDF, CDF, Integer
 from sage.modules.all import vector

src/sage/finance/markov_multifractal_cython.pyx

@@ -3,7 +3,6 @@ Markov Switching Multifractal model
 
 Cython code
 """
-from __future__ import absolute_import
 
 from sage.misc.randstate cimport randstate, current_randstate
 

src/sage/finance/time_series.pyx

@@ -46,8 +46,6 @@ AUTHOR:
 #                  http://www.gnu.org/licenses/
 #*****************************************************************************
 
-from __future__ import absolute_import
-
 cimport cython
 from cpython.bytes cimport PyBytes_FromStringAndSize, PyBytes_AsString
 from libc.math cimport exp, floor, log, pow, sqrt

src/sage/functions/prime_pi.pyx

@@ -27,7 +27,6 @@ EXAMPLES::
 #  the License, or (at your option) any later version.
 #                  http://www.gnu.org/licenses/
 #*****************************************************************************
-from __future__ import absolute_import
 
 from cypari2.paridecl cimport *
 from cysignals.signals cimport *

src/sage/games/sudoku_backtrack.pyx

@@ -3,8 +3,6 @@ This module contains Cython code for a backtracking algorithm to solve Sudoku pu
 
 Once Cython implements closures and the ``yield`` keyword is possible, this can be moved into the ``sage.games.sudoku`` module, as part of the ``Sudoku.backtrack`` method, and this module can be banned.
 """
-from __future__ import print_function
-
 
 def backtrack_all(n, puzzle):
     r"""

src/sage/geometry/integral_points.pyx

@@ -12,7 +12,6 @@ Cython helper methods to compute integral points in polyhedra.
 # (at your option) any later version.
 #                  http://www.gnu.org/licenses/
 #*****************************************************************************
-from __future__ import print_function, absolute_import
 
 from cysignals.signals cimport sig_check
 import copy

src/sage/geometry/point_collection.pyx

@@ -75,7 +75,6 @@ need to spend time and memory four times.
 #  the License, or (at your option) any later version.
 #                  http://www.gnu.org/licenses/
 #*****************************************************************************
-from __future__ import print_function
 
 from sage.structure.sage_object cimport SageObject
 from sage.structure.richcmp cimport richcmp_not_equal, richcmp