Remove unused imports (GH-4643)

Cython/Build/Dependencies.py

@@ -10,7 +10,6 @@ import os
 import shutil
 import subprocess
 import re, sys, time
-import warnings
 from glob import iglob
 from io import open as io_open
 from os.path import relpath as _relpath
@@ -44,7 +43,7 @@ except:
 
 from .. import Utils
 from ..Utils import (cached_function, cached_method, path_exists,
-    safe_makedirs, copy_file_to_dir_if_newer, is_package_dir, replace_suffix)
+    safe_makedirs, copy_file_to_dir_if_newer, is_package_dir)
 from ..Compiler import Errors
 from ..Compiler.Main import Context
 from ..Compiler.Options import CompilationOptions, default_options

Cython/Build/IpythonMagic.py

@@ -59,11 +59,6 @@ import textwrap
 IO_ENCODING = sys.getfilesystemencoding()
 IS_PY2 = sys.version_info[0] < 3
 
-try:
-    from importlib import reload
-except ImportError:   # Python 2 had a builtin function
-    pass
-
 import hashlib
 from distutils.core import Distribution, Extension
 from distutils.command.build_ext import build_ext

Cython/CodeWriter.py

@@ -9,7 +9,7 @@ from __future__ import absolute_import, print_function
 
 from .Compiler.Visitor import TreeVisitor
 from .Compiler.ExprNodes import *
-from .Compiler.Nodes import CNameDeclaratorNode, CSimpleBaseTypeNode
+from .Compiler.Nodes import CSimpleBaseTypeNode
 
 
 class LinesResult(object):

Cython/Compiler/Builtin.py

@@ -9,7 +9,6 @@ from .Symtab import BuiltinScope, StructOrUnionScope, ModuleScope
 from .Code import UtilityCode
 from .TypeSlots import Signature
 from . import PyrexTypes
-from . import Options
 
 
 # C-level implementations of builtin types, functions and methods

Cython/Compiler/Code.py

@@ -28,7 +28,6 @@ from . import Naming
 from . import Options
 from . import DebugFlags
 from . import StringEncoding
-from . import Version
 from .. import Utils
 from .Scanning import SourceDescriptor
 from ..StringIOTree import StringIOTree

Cython/Compiler/Dataclass.py

@@ -7,16 +7,14 @@ import operator
 from . import ExprNodes
 from . import Nodes
 from . import PyrexTypes
-from . import UtilNodes
 from . import Builtin
 from . import Naming
 from .Errors import error, warning
 from .Code import UtilityCode, TempitaUtilityCode
 from .Visitor import VisitorTransform
-from .StringEncoding import BytesLiteral, EncodedString
+from .StringEncoding import EncodedString
 from .TreeFragment import TreeFragment
-from .ParseTreeTransforms import (NormalizeTree, SkipDeclarations, AnalyseDeclarationsTransform,
-                                  MarkClosureVisitor)
+from .ParseTreeTransforms import NormalizeTree, SkipDeclarations
 from .Options import copy_inherited_directives
 
 _dataclass_loader_utilitycode = None

Cython/Compiler/ExprNodes.py

@@ -29,9 +29,9 @@ from .Code import UtilityCode, TempitaUtilityCode
 from . import StringEncoding
 from . import Naming
 from . import Nodes
-from .Nodes import Node, utility_code_for_imports, SingleAssignmentNode, PassStatNode
+from .Nodes import Node, utility_code_for_imports, SingleAssignmentNode
 from . import PyrexTypes
-from .PyrexTypes import py_object_type, c_long_type, typecast, error_type, \
+from .PyrexTypes import py_object_type, typecast, error_type, \
     unspecified_type
 from . import TypeSlots
 from .Builtin import (
@@ -45,8 +45,8 @@ from .. import Utils
 from .Annotate import AnnotationItem
 from . import Future
 from ..Debugging import print_call_chain
-from .DebugFlags import debug_disposal_code, debug_temp_alloc, \
-    debug_coercion
+from .DebugFlags import debug_disposal_code, debug_coercion
+
 from .Pythran import (to_pythran, is_pythran_supported_type, is_pythran_supported_operation_type,
      is_pythran_expr, pythran_func_type, pythran_binop_type, pythran_unaryop_type, has_np_pythran,
      pythran_indexing_code, pythran_indexing_type, is_pythran_supported_node_or_none, pythran_type,

Cython/Compiler/Nodes.py

@@ -13,7 +13,7 @@ cython.declare(sys=object, os=object, copy=object,
                CppClassScope=object, UtilityCode=object, EncodedString=object,
                error_type=object, _py_int_types=object)
 
-import sys, os, copy
+import sys, copy
 from itertools import chain
 
 from . import Builtin

Cython/Compiler/Parsing.py

@@ -22,7 +22,7 @@ import sys
 from unicodedata import lookup as lookup_unicodechar, category as unicode_category
 from functools import partial, reduce
 
-from .Scanning import PyrexScanner, FileSourceDescriptor, StringSourceDescriptor
+from .Scanning import PyrexScanner, FileSourceDescriptor
 from . import Nodes
 from . import ExprNodes
 from . import Builtin

Cython/Compiler/PyrexTypes.py

@@ -19,7 +19,7 @@ from .Code import UtilityCode, LazyUtilityCode, TempitaUtilityCode
 from . import StringEncoding
 from . import Naming
 
-from .Errors import error, warning, CannotSpecialize
+from .Errors import error, CannotSpecialize
 
 
 class BaseType(object):

Cython/Compiler/Tests/TestTreeFragment.py

@@ -2,7 +2,6 @@ from Cython.TestUtils import CythonTest
 from Cython.Compiler.TreeFragment import *
 from Cython.Compiler.Nodes import *
 from Cython.Compiler.UtilNodes import *
-import Cython.Compiler.Naming as Naming
 
 class TestTreeFragments(CythonTest):
 

Cython/Compiler/Tests/TestTreePath.py

 import unittest
-from Cython.Compiler.Visitor import PrintTree
 from Cython.TestUtils import TransformTest
 from Cython.Compiler.TreePath import find_first, find_all
 from Cython.Compiler import Nodes, ExprNodes

Cython/Debugger/Tests/test_libpython_in_gdb.py

@@ -6,16 +6,13 @@ Lib/test/test_gdb.py in the Python source. These tests are run in gdb and
 called from test_libcython_in_gdb.main()
 """
 
-import os
-import sys
-
 import gdb
 
 from Cython.Debugger import libcython
 from Cython.Debugger import libpython
 
 from . import test_libcython_in_gdb
-from .test_libcython_in_gdb import _debug, inferior_python_version
+from .test_libcython_in_gdb import inferior_python_version
 
 
 class TestPrettyPrinters(test_libcython_in_gdb.DebugTestCase):

Cython/Distutils/extension.py

@@ -8,11 +8,6 @@ __revision__ = "$Id:$"
 import sys
 import distutils.extension as _Extension
 
-try:
-    import warnings
-except ImportError:
-    warnings = None
-
 
 class Extension(_Extension.Extension):
     # When adding arguments to this constructor, be sure to update