add tuple check to style_checker

style_checker.py

@@ -25,15 +25,17 @@
         a.transpose((2, 0, 1))  # OK
         a.reshape(2, 0, 1)  # NG
 
-- Initialization of empty `list`/`dict`.
-    An empty `list`/`dict` should be initialized by `[]`/`{}`.
+- Initialization of empty `list`/`dict`/`tuple`.
+    An empty `list`/`dict`/`tuple` should be initialized by `[]`/`{}`/`()`.
 
     Example:
         a = []  # OK
         b = {}  # OK
+        c = ()  # OK
 
         a = list()  # NG
         b = dict()  # NG
+        c = tuple()  # NG
  """
 
 import argparse
@@ -114,6 +116,15 @@ def check_empty_dict(node):
         yield (node.lineno, 'init by dict()')
 
 
+def check_empty_tuple(node):
+    if not isinstance(node, ast.Call):
+        return
+    if not isinstance(node.func, ast.Name):
+        return
+    if node.func.id == 'tuple' and len(node.args) == 0:
+        yield (node.lineno, 'init by tuple()')
+
+
 def main():
     parser = argparse.ArgumentParser()
     parser.add_argument('dir')