add simple placeholder

Author: czheo

syntax_sugar/__init__.py

@@ -3,3 +3,4 @@
 from .pipe import *
 from .infix import *
 from .stream import *
+from .placeholder import *

syntax_sugar/placeholder.py

@@ -0,0 +1,12 @@
+__all__ = [
+    'placeholder',
+    '_',
+]
+
+class PlaceHolder:
+    def __getattribute__(self, action):
+        def wrapper(*argv, **kwargv):
+            return lambda data: getattr(data, action)(*argv, **kwargv)
+        return wrapper
+
+_ = placeholder = PlaceHolder()