Run pyupgrade across codebase to modernize syntax and patterns (#1622)

pyupgrade is a tool to automatically upgrade syntax for newer versions
of the Python language.

The project has been Python 3 only since
35544e2fc6eed0ce4a27ec7285aac71ff0ddc473, allowing for several cleanups:

- Remove unnecessary "-*- coding: utf-8 -*-" cookie. Python 3 reads all
  source files as utf-8 by default.

- Replace IOError/EnvironmentError with OSError. Python 3 unified these
  exceptions. The old names are aliases only.

- Use the Python 3 shorter super() syntax.

- Remove "utf8" argument form encode/decode. In Python 3, this value is
  the default.

- Remove "r" from open() calls. In Python 3, this value is the default.

- Remove u prefix from Unicode strings. In Python 3, all strings are
  Unicode.

- Replace io.open() with builtin open(). In Python 3, these functions
  are functionally equivalent.

Co-authored-by: Matthäus G. Chajdas <Anteru@users.noreply.github.com>

1 files changed, 10 insertions, 11 deletions

diff --git a/tests/test_coffeescript.py b/tests/test_coffeescript.py
index 60ddfcd8..5d69a8aa 100644
--- a/tests/test_coffeescript.py
+++ b/tests/test_coffeescript.py
@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 """
     CoffeeScript tests
     ~~~~~~~~~~~~~~~~~~
@@ -54,17 +53,17 @@ def test_coffee_slashes(lexer, golden):
 
 
 def test_mixed_slashes(lexer):
-    fragment = u'a?/foo/:1/2;\n'
+    fragment = 'a?/foo/:1/2;\n'
     tokens = [
-        (Token.Name.Other, u'a'),
-        (Token.Operator, u'?'),
-        (Token.Literal.String.Regex, u'/foo/'),
-        (Token.Operator, u':'),
-        (Token.Literal.Number.Integer, u'1'),
-        (Token.Operator, u'/'),
-        (Token.Literal.Number.Integer, u'2'),
-        (Token.Punctuation, u';'),
-        (Token.Text, u'\n'),
+        (Token.Name.Other, 'a'),
+        (Token.Operator, '?'),
+        (Token.Literal.String.Regex, '/foo/'),
+        (Token.Operator, ':'),
+        (Token.Literal.Number.Integer, '1'),
+        (Token.Operator, '/'),
+        (Token.Literal.Number.Integer, '2'),
+        (Token.Punctuation, ';'),
+        (Token.Text, '\n'),
     ]
     assert list(lexer.get_tokens(fragment)) == tokens