Pythonに思うこと
Python の map filter をRubyのようにメソッドとして使いたい
class myList(list): def puts(self): print self return self def map(self,f): return myList(map(f,self)) def filter(self,f): return myList(filter(f,self)) def join(self,s=" "): return s.join(self.map(lambda x:str(x))) def sort(self,f=lambda x:x): return myList(sorted(self,key=f)) a = myList(range(1,3+1)).puts() #[1, 2, 3] a.map(lambda x:x*2).puts() #[2, 4, 6] a.filter(lambda x:x%2==1).puts() # [1, 3] a.sort(lambda x:-x).puts() # [3, 2, 1] print a.map(lambda x:x+1).join(", ") #2, 3, 4