filter string

Author: qiwsir

newcodes/answers/q70.py

@@ -0,0 +1,17 @@
+#!/usr/bin/env python
+# coding=utf-8
+
+class Keeper:
+    def __init__(self, keep):
+        self.keep = keep
+    def __getitem__(self, s):
+        if s not in self.keep:
+            return None
+        return s
+    def __call__(self, s):
+        return s.translate(self)
+
+if __name__ == "__main__":
+    mf = Keeper
+    cang = mf('canglaoshi')
+    print(cang("what is your name? my name is laoshicang"))