Fix Flake8 Errors (#442)

* Fix PEP8 [E101](https://github.com/PyCQA/pycodestyle/blob/2.8.0/docs/intro.rst#error-codes)

* Fix PEP8 [E711](https://github.com/PyCQA/pycodestyle/blob/2.8.0/docs/intro.rst#error-codes)

* Fix E999 (python2)

* Fix PEP8 [F401](https://flake8.pycqa.org/en/4.0.1/user/error-codes.html)

18 files changed, 16 insertions, 29 deletions

diff --git a/examples/dump_ast.py b/examples/dump_ast.py
index 63f5e2d..b7c3273 100644
--- a/examples/dump_ast.py
+++ b/examples/dump_ast.py
@@ -14,7 +14,7 @@ import sys
 # your site-packages/ with setup.py
 sys.path.extend(['.', '..'])
 
-from pycparser import c_parser, c_ast, parse_file
+from pycparser import parse_file
 
 if __name__ == "__main__":
     argparser = argparse.ArgumentParser('Dump AST')
diff --git a/examples/explore_ast.py b/examples/explore_ast.py
index 1f6e0ae..a75dd1f 100644
--- a/examples/explore_ast.py
+++ b/examples/explore_ast.py
@@ -20,7 +20,7 @@ import sys
 #
 sys.path.extend(['.', '..'])
 
-from pycparser import c_parser, c_ast
+from pycparser import c_parser
 
 # This is some C source to parse. Note that pycparser must begin
 # at the top level of the C file, i.e. with either declarations
diff --git a/examples/func_calls.py b/examples/func_calls.py
index 97a7271..ce9cc87 100644
--- a/examples/func_calls.py
+++ b/examples/func_calls.py
@@ -14,7 +14,7 @@ import sys
 # your site-packages/ with setup.py
 sys.path.extend(['.', '..'])
 
-from pycparser import c_parser, c_ast, parse_file
+from pycparser import c_ast, parse_file
 
 
 # A visitor with some state information (the funcname it's looking for)
diff --git a/examples/func_defs.py b/examples/func_defs.py
index 8fe9889..5023ff7 100644
--- a/examples/func_defs.py
+++ b/examples/func_defs.py
@@ -17,7 +17,7 @@ import sys
 # your site-packages/ with setup.py
 sys.path.extend(['.', '..'])
 
-from pycparser import c_parser, c_ast, parse_file
+from pycparser import c_ast, parse_file
 
 
 # A simple visitor for FuncDef nodes that prints the names and
diff --git a/examples/func_defs_add_param.py b/examples/func_defs_add_param.py
index d79fef6..11cb635 100644
--- a/examples/func_defs_add_param.py
+++ b/examples/func_defs_add_param.py
@@ -8,7 +8,6 @@
 # License: BSD
 #-----------------------------------------------------------------
 from __future__ import print_function
-import sys
 
 from pycparser import c_parser, c_ast, c_generator
 
diff --git a/examples/rewrite_ast.py b/examples/rewrite_ast.py
index d38e015..164abb5 100644
--- a/examples/rewrite_ast.py
+++ b/examples/rewrite_ast.py
@@ -7,7 +7,6 @@
 # License: BSD
 #-----------------------------------------------------------------
 from __future__ import print_function
-import sys
 
 from pycparser import c_parser
 
diff --git a/pycparser/_ast_gen.py b/pycparser/_ast_gen.py
index 027efe7..0f7d330 100644
--- a/pycparser/_ast_gen.py
+++ b/pycparser/_ast_gen.py
@@ -10,7 +10,6 @@
 # Eli Bendersky [https://eli.thegreenplace.net/]
 # License: BSD
 #-----------------------------------------------------------------
-import pprint
 from string import Template
 
 
diff --git a/pycparser/c_lexer.py b/pycparser/c_lexer.py
index f861b5c..2990170 100644
--- a/pycparser/c_lexer.py
+++ b/pycparser/c_lexer.py
@@ -7,7 +7,6 @@
 # License: BSD
 #------------------------------------------------------------------------------
 import re
-import sys
 
 from .ply import lex
 from .ply.lex import TOKEN
diff --git a/pycparser/c_parser.py b/pycparser/c_parser.py
index 1be11a4..b1efac1 100644
--- a/pycparser/c_parser.py
+++ b/pycparser/c_parser.py
@@ -6,13 +6,11 @@
 # Eli Bendersky [https://eli.thegreenplace.net/]
 # License: BSD
 #------------------------------------------------------------------------------
-import re
-
 from .ply import yacc
 
 from . import c_ast
 from .c_lexer import CLexer
-from .plyparser import PLYParser, Coord, ParseError, parameterized, template
+from .plyparser import PLYParser, ParseError, parameterized, template
 from .ast_transforms import fix_switch_cases, fix_atomic_specifiers
 
 
@@ -1221,7 +1219,7 @@ class CParser(PLYParser):
         arr = c_ast.ArrayDecl(
             type=None,
             dim=c_ast.ID(p[4], self._token_coord(p, 4)),
-            dim_quals=p[3] if p[3] != None else [],
+            dim_quals=p[3] if p[3] is not None else [],
             coord=p[1].coord)
 
         p[0] = self._type_modify_decl(decl=p[1], modifier=arr)
diff --git a/tests/test_c_ast.py b/tests/test_c_ast.py
index 6ea3ceb..eeeb20b 100644
--- a/tests/test_c_ast.py
+++ b/tests/test_c_ast.py
@@ -1,5 +1,3 @@
-import pprint
-import re
 import sys
 import unittest
 import weakref
diff --git a/tests/test_c_generator.py b/tests/test_c_generator.py
index 4436a43..d166d03 100644
--- a/tests/test_c_generator.py
+++ b/tests/test_c_generator.py
@@ -1,5 +1,4 @@
 import os
-import platform
 import sys
 import unittest
 
diff --git a/tests/test_c_parser.py b/tests/test_c_parser.py
index e83bd7d..33f3f07 100755
--- a/tests/test_c_parser.py
+++ b/tests/test_c_parser.py
@@ -1,7 +1,5 @@
 #!/usr/bin/env python
 
-import pprint
-import re
 import os, sys
 import io
 import unittest
@@ -10,7 +8,7 @@ sys.path[0:0] = ['.', '..']
 
 from pycparser import c_parser
 from pycparser.c_ast import *
-from pycparser.c_parser import CParser, Coord, ParseError
+from pycparser.c_parser import ParseError
 
 _c_parser = c_parser.CParser(
                 lex_optimize=False,
@@ -729,7 +727,7 @@ class TestCParser_fundamentals(TestCParser_base):
     def test_parenthesized_compounds(self):
         e = self.parse(r'''
         void foo() {
-         	int a;
+            int a;
             ({});
             ({ 1; });
             ({ 1; 2; });
diff --git a/tests/test_general.py b/tests/test_general.py
index 3d43cbf..e6b654e 100644
--- a/tests/test_general.py
+++ b/tests/test_general.py
@@ -1,5 +1,4 @@
 import os
-import platform
 import sys
 import unittest
 
diff --git a/utils/internal/fake_includes.py b/utils/internal/fake_includes.py
index 1ce69fa..0e91644 100644
--- a/utils/internal/fake_includes.py
+++ b/utils/internal/fake_includes.py
@@ -1,10 +1,11 @@
+from __future__ import print_function
 import os.path
 
 for cur_path, dirs, files in os.walk('.'):
     if cur_path == '.':
         for f in files:
             if f.endswith('.h'):
-                print f
+                print(f)
                 fo = open(f, 'w')
                 fo.write('#include "_fake_defines.h"\n')
                 fo.write('#include "_fake_typedefs.h"\n')
diff --git a/utils/internal/make_fake_typedefs.py b/utils/internal/make_fake_typedefs.py
index b82e92f..5ffd04b 100644
--- a/utils/internal/make_fake_typedefs.py
+++ b/utils/internal/make_fake_typedefs.py
@@ -1,12 +1,13 @@
+from __future__ import print_function
 import sys
 sys.path.insert(0, '../..')
 
-from pycparser import c_parser, c_ast, parse_file
+from pycparser import c_ast, parse_file
 
 
 class MyVisitor(c_ast.NodeVisitor):
     def visit_Typedef(self, node):
-        print 'typedef int %s;' % node.name
+        print('typedef int %s;' % node.name)
 
 
 
diff --git a/utils/internal/memprofiling.py b/utils/internal/memprofiling.py
index 5b25120..8584a44 100644
--- a/utils/internal/memprofiling.py
+++ b/utils/internal/memprofiling.py
@@ -1,8 +1,6 @@
-import sys
 from pycparser import parse_file
 from pycparser.c_ast import *
-from pycparser.c_parser import CParser, Coord, ParseError
-from pycparser.c_lexer import CLexer
+from pycparser.c_parser import CParser
 
 
 def expand_decl(decl):
diff --git a/utils/internal/zz-ctoc.py b/utils/internal/zz-ctoc.py
index 434f9bc..52e037f 100644
--- a/utils/internal/zz-ctoc.py
+++ b/utils/internal/zz-ctoc.py
@@ -1,5 +1,5 @@
 from __future__ import print_function
-from pycparser import parse_file, c_parser, c_generator
+from pycparser import c_parser, c_generator
 
 if __name__ == '__main__':
     src = r'''
diff --git a/utils/internal/zz_parse.py b/utils/internal/zz_parse.py
index 9979578..a769ef6 100644
--- a/utils/internal/zz_parse.py
+++ b/utils/internal/zz_parse.py
@@ -1,7 +1,6 @@
 from __future__ import print_function
 
-import sys
-from pycparser import c_parser, c_generator, c_ast, parse_file
+from pycparser import c_parser, c_generator
 
 
 if __name__ == "__main__":