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>

* TNTLexer: Don't crash on unexpected EOL

Catch IndexErrors in each line and error the rest of the line,
leaving whatever tokens were found.

* Write and pass tests for Typographic Number Theory

pygments/lexers/tnt.py:
* Fix indentation on import
* Fix: TNTLexer.cur is class-level reference if not initialized
  in get_tokens_unprocessed, so init it in __init__ too
* Fix: Fantasy markers are not allowed as components of other formulas,
  so have a dedicated check for them in the body of get_tokens_unprocessed
  which disables the normal formula handling if present
* Clarify TNTLexer.lineno docstring
* Attempt to discard tokens before an IndexError

+tests/test_tnt.py:
* Test every method, and test both +ve and -ve matches for most
* Lexer fixture is test-level to reinitialize cur clean each time
* Don't test actual get_tokens_unprocessed method (besides for fantasy markers)
  because the text testing is left to examplefiles

AUTHORS:
+ Add myself to credits :)

* Add a TNT test just to make sure no crashes

* Add Typographic Number Theory lexer

Originally tried to use RegexLexer, but the
structure of TNT is too rigid for it to handle.
Went with a direct parser instead.

Co-authored-by: lonetwin <steve@lonetwin.net>