Add license header and hashbang

constants.py

@@ -1,3 +1,11 @@
+#! /usr/bin/env python
+# -*- coding: utf-8 -*-
+# vim:fenc=utf-8
+#
+# Copyright © 2019 pavle <pavle.portic@tilda.center>
+#
+# Distributed under terms of the BSD-3-Clause license.
+
 NUMBER = 'NUMBER'
 EOF = 'EOF'
 

interpreter.py

@@ -1,3 +1,11 @@
+#! /usr/bin/env python
+# -*- coding: utf-8 -*-
+# vim:fenc=utf-8
+#
+# Copyright © 2019 pavle <pavle.portic@tilda.center>
+#
+# Distributed under terms of the BSD-3-Clause license.
+
 from constants import (
 	NUMBER, EOF,
 	PLUS, MINUS, MUL, DIV, POW,

lexer.py

@@ -1,3 +1,11 @@
+#! /usr/bin/env python
+# -*- coding: utf-8 -*-
+# vim:fenc=utf-8
+#
+# Copyright © 2019 pavle <pavle.portic@tilda.center>
+#
+# Distributed under terms of the BSD-3-Clause license.
+
 import operator
 
 from token import Token

main.py

@@ -1,3 +1,11 @@
+#! /usr/bin/env python
+# -*- coding: utf-8 -*-
+# vim:fenc=utf-8
+#
+# Copyright © 2019 pavle <pavle.portic@tilda.center>
+#
+# Distributed under terms of the BSD-3-Clause license.
+
 from lexer import Lexer
 from interpreter import Interpreter
 from constants import DEC

token.py

@@ -1,3 +1,11 @@
+#! /usr/bin/env python
+# -*- coding: utf-8 -*-
+# vim:fenc=utf-8
+#
+# Copyright © 2019 pavle <pavle.portic@tilda.center>
+#
+# Distributed under terms of the BSD-3-Clause license.
+
 class Token():
 	def __init__(self, type, value):
 		self.type = type