--- a/doc/conf.py	Wed Feb 13 18:41:43 2019 +0100
+++ b/doc/conf.py	Wed Feb 13 18:51:26 2019 +0100
@@ -28,9 +28,6 @@
 # You should have received a copy of the GNU Lesser General Public License along
 # with rql. If not, see <http://www.gnu.org/licenses/>.
 
-import sys
-import os
-
 # If your extensions are in another directory, add it here. If the directory
 # is relative to the documentation root, use os.path.abspath to make it
 # absolute, like shown here.

--- a/rql/__init__.py	Wed Feb 13 18:41:43 2019 +0100
+++ b/rql/__init__.py	Wed Feb 13 18:51:26 2019 +0100
@@ -128,7 +128,6 @@
         """
         # print('simplify', rqlst.as_string())
         if rqlst.TYPE == 'select':
-            from rql import nodes
             for select in rqlst.children:
                 self._simplify(select)
 

--- a/rql/editextensions.py	Wed Feb 13 18:41:43 2019 +0100
+++ b/rql/editextensions.py	Wed Feb 13 18:51:26 2019 +0100
@@ -19,7 +19,7 @@
 
 __docformat__ = "restructuredtext en"
 
-from rql.nodes import Constant, Variable, VariableRef, Relation, make_relation
+from rql.nodes import Constant, VariableRef, Relation, make_relation
 
 
 def switch_selection(rqlst, new_var, old_var):

--- a/rql/nodes.py	Wed Feb 13 18:41:43 2019 +0100
+++ b/rql/nodes.py	Wed Feb 13 18:51:26 2019 +0100
@@ -24,16 +24,14 @@
 __docformat__ = "restructuredtext en"
 
 import sys
-from itertools import chain
 from decimal import Decimal
 from datetime import datetime, date, time, timedelta
-from time import localtime
 
 from six import string_types
 
 from rql import CoercionError, RQLException
 from rql.base import BaseNode, Node, BinaryNode, LeafNode
-from rql.utils import (function_description, quote, uquote, common_parent,
+from rql.utils import (function_description, uquote, common_parent,
                        VisitableMixIn)
 
 CONSTANT_TYPES = frozenset((None, 'Date', 'Datetime', 'Boolean', 'Float', 'Int',

--- a/rql/parser.py	Wed Feb 13 18:41:43 2019 +0100
+++ b/rql/parser.py	Wed Feb 13 18:51:26 2019 +0100
@@ -46,13 +46,11 @@
 """
 
 from __future__ import print_function
-from warnings import warn
 
 from rql.nodes import *
 from rql.stmts import Union, Select, Delete, Insert, Set
 
 # Begin -- grammar generated by Yapps
-import sys
 import re
 from yapps import runtime
 

--- a/rql/pygments_ext.py	Wed Feb 13 18:41:43 2019 +0100
+++ b/rql/pygments_ext.py	Wed Feb 13 18:51:26 2019 +0100
@@ -12,7 +12,7 @@
 
 from pygments.lexer import RegexLexer, _mapping
 from pygments.token import Punctuation, \
-     Text, Comment, Operator, Keyword, Name, String, Number
+     Text, Operator, Keyword, Name, String, Number
 
 __all__ = ['RqlLexer']
 

--- a/rql/stcheck.py	Wed Feb 13 18:41:43 2019 +0100
+++ b/rql/stcheck.py	Wed Feb 13 18:51:26 2019 +0100
@@ -19,15 +19,13 @@
 
 __docformat__ = "restructuredtext en"
 
-from itertools import chain
 from logilab.common.graph import has_path
 from logilab.database import UnknownFunction
 
 from rql._exceptions import BadRQLQuery
 from rql.utils import function_description
 from rql.nodes import (Relation, VariableRef, Constant, Not, Exists, Function,
-                       And, Variable, Comparison, variable_refs, make_relation)
-from rql.stmts import Union
+                       And, Comparison, variable_refs, make_relation)
 
 
 def _var_graphid(subvarname, trmap, select):

--- a/rql/stmts.py	Wed Feb 13 18:41:43 2019 +0100
+++ b/rql/stmts.py	Wed Feb 13 18:51:26 2019 +0100
@@ -31,7 +31,6 @@
 from six import integer_types
 from six.moves import range
 
-from logilab.common.decorators import cached
 from logilab.common.deprecation import deprecated
 
 from rql import BadRQLQuery, CoercionError, nodes

--- a/rql/undo.py	Wed Feb 13 18:41:43 2019 +0100
+++ b/rql/undo.py	Wed Feb 13 18:51:26 2019 +0100
@@ -19,7 +19,7 @@
 
 __docformat__ = "restructuredtext en"
 
-from rql.nodes import Exists, VariableRef, Variable, BinaryNode
+from rql.nodes import Exists, VariableRef, BinaryNode
 from rql.stmts import Select
 
 

--- a/test/unittest_editextensions.py	Wed Feb 13 18:41:43 2019 +0100
+++ b/test/unittest_editextensions.py	Wed Feb 13 18:51:26 2019 +0100
@@ -20,7 +20,6 @@
 
 from rql import parse
 from rql.nodes import Exists
-from rql.editextensions import *
 
 
 class RQLUndoTestCase(TestCase):

--- a/test/unittest_parser.py	Wed Feb 13 18:41:43 2019 +0100
+++ b/test/unittest_parser.py	Wed Feb 13 18:51:26 2019 +0100
@@ -23,7 +23,7 @@
 from yapps.runtime import print_error, SyntaxError
 
 from rql.parser import Hercule, HerculeScanner
-from rql import BadRQLQuery, RQLSyntaxError, nodes, stmts, parse
+from rql import BadRQLQuery, RQLSyntaxError, nodes
 from rql import parse
 
 if PY2:

--- a/tools/rql_analyze.py	Wed Feb 13 18:41:43 2019 +0100
+++ b/tools/rql_analyze.py	Wed Feb 13 18:51:26 2019 +0100
@@ -19,8 +19,7 @@
 
 from ginco.server.schema_readers import load_schema
 from rql import RQLHelper
-from rql.analyze import AltETypeResolver, Alt2ETypeResolver, ETypeResolver, ETypeResolver2
-from pprint import pprint
+from rql.analyze import ETypeResolver, ETypeResolver2
 import sys
 
 

--- a/tools/rql_cmp.py	Wed Feb 13 18:41:43 2019 +0100
+++ b/tools/rql_cmp.py	Wed Feb 13 18:51:26 2019 +0100
@@ -19,7 +19,7 @@
 
 from rql.rqlparse import parse as cparse
 from rql import parse
-from rql.compare2 import compare_tree, RQLCanonizer, make_canon_dict
+from rql.compare2 import make_canon_dict
 import sys
 from rql.nodes import *
 from rql.stmts import *

--- a/tox.ini	Wed Feb 13 18:41:43 2019 +0100
+++ b/tox.ini	Wed Feb 13 18:51:26 2019 +0100
@@ -11,7 +11,7 @@
 basepython = python3
 deps =
   flake8
-commands = flake8 {posargs:--ignore=E501,E741,F401,F401,F403,F405,F811,F821,F841,E123,E226,W503,E241,W504,E126,E121}
+commands = flake8 {posargs:--ignore=E501,E741,F403,F405,F811,F821,F841,E123,E226,W503,E241,W504,E126,E121}
 
 [pytest]
 python_files = *test_*.py