Improved code quality

test/interpreter/test_lexer.py

@@ -1,6 +1,7 @@
 from unittest import TestCase
 from truck.interpreter import Lexer
 
+
 class TestLexer(TestCase):
     def test_ident(self):
         self._check("ident", [("Ident", "ident"), "Eof"])
@@ -35,7 +36,8 @@ def _check(self, s, r):
         ts = self._get_tokens(s)
         self.assertEqual(ts, r)
 
-    def _get_tokens(self, s):
+    @staticmethod
+    def _get_tokens(s):
         l = Lexer(s)
         ts = []
         while True:

test/interpreter/test_parser.py

@@ -2,6 +2,7 @@
 from truck.interpreter import *
 from truck.interpreter.ast import *
 
+
 class TestParser(TestCase):
     def test_if(self):
         p = Parser(Lexer("""

test/truck/test_class.py

@@ -1,6 +1,7 @@
 from unittest import TestCase
 from truck import truck
 
+
 class TestClass(TestCase):
     def test_normal(self):
         res = truck.execute("""

test/truck/test_function.py

@@ -1,6 +1,7 @@
 from unittest import TestCase
 from truck import truck
 
+
 class TestFunction(TestCase):
     def test_normal(self):
         res = truck.execute("""

truck/__main__.py

@@ -3,8 +3,7 @@
 
 if __name__ == "__main__":
     args = sys.argv[1:]
-    if args == []:
+    if not args:
         run_prompt()
     else:
         run_file(args[0])
-        pass

truck/interpreter/lexer.py

@@ -2,6 +2,7 @@
 import re
 from codecs import decode
 
+
 class Lexer:
     def __init__(self, string):
         self.string = string

truck/interpreter/parser.py

@@ -1,12 +1,12 @@
 from .ast import *
 
+
 class Parser:
     def __init__(self, lexer):
         self.lexer = lexer
 
     def parse(self):
-        root = self._program()
-        return root
+        return self._program()
 
     def _program(self):
         # program -> (stmt)

truck/truck.py

@@ -6,6 +6,7 @@
 __about__ ="""Truck {version}
 """.format(version=__version__)
 
+
 def execute(string, env=None):
     if env is None:
         env = Environ()