Remove Python 2 handling code (#2098)

* Remove Python 2 update modal

* Remove Python 2 handling code

* Remove backports dependencies

* Remove uses of future and __future__

* Fix import

* Remove requirements

* Update lib folder

* Clean up imports and blank lines

---------

Co-authored-by: JonnyWong16 <9099342+JonnyWong16@users.noreply.github.com>

lib/libfuturize/fixer_util.py

@@ -9,11 +9,11 @@ python-modernize licence: BSD (from python-modernize/LICENSE)
 """
 
 from lib2to3.fixer_util import (FromImport, Newline, is_import,
-                                find_root, does_tree_import, Comma)
+                                find_root, does_tree_import,
+                                Call, Name, Comma)
 from lib2to3.pytree import Leaf, Node
-from lib2to3.pygram import python_symbols as syms, python_grammar
+from lib2to3.pygram import python_symbols as syms
 from lib2to3.pygram import token
-from lib2to3.fixer_util import (Node, Call, Name, syms, Comma, Number)
 import re
 
 
@@ -116,7 +116,7 @@ def suitify(parent):
     """
     for node in parent.children:
         if node.type == syms.suite:
-            # already in the prefered format, do nothing
+            # already in the preferred format, do nothing
             return
 
     # One-liners have no suite node, we have to fake one up
@@ -390,6 +390,7 @@ def touch_import_top(package, name_to_import, node):
                 break
         insert_pos = idx
 
+    children_hooks = []
     if package is None:
         import_ = Node(syms.import_name, [
             Leaf(token.NAME, u"import"),
@@ -413,8 +414,6 @@ def touch_import_top(package, name_to_import, node):
                                  ]
                                 )
             children_hooks = [install_hooks, Newline()]
-        else:
-            children_hooks = []
 
         # FromImport(package, [Leaf(token.NAME, name_to_import, prefix=u" ")])
 
@@ -448,7 +447,6 @@ def check_future_import(node):
     else:
         node = node.children[3]
     # now node is the import_as_name[s]
-    # print(python_grammar.number2symbol[node.type])  # breaks sometimes
     if node.type == syms.import_as_names:
         result = set()
         for n in node.children:

lib/libfuturize/fixes/fix_metaclass.py

@@ -37,7 +37,7 @@ from lib2to3.fixer_util import Name, syms, Node, Leaf, touch_import, Call, \
 
 def has_metaclass(parent):
     """ we have to check the cls_node without changing it.
-        There are two possiblities:
+        There are two possibilities:
           1)  clsdef => suite => simple_stmt => expr_stmt => Leaf('__meta')
           2)  clsdef => simple_stmt => expr_stmt => Leaf('__meta')
     """
@@ -63,7 +63,7 @@ def fixup_parse_tree(cls_node):
             # already in the preferred format, do nothing
             return
 
-    # !%@#! oneliners have no suite node, we have to fake one up
+    # !%@#! one-liners have no suite node, we have to fake one up
     for i, node in enumerate(cls_node.children):
         if node.type == token.COLON:
             break