python学习笔记之匿名函数

          def add(x,y):
          

              return x+y
          

          

          add = lambda x,y:x+y
          

          print(add(1,2))
          

          

          dic={'k1':10,'k2':100,'k3':30}
          

          def func(key):
          

              return dic[key]
          

          print(max(dic,key=func))   #根据返回值判断最大值，返回值最大的那个参数是结果
          

          print(max(dic,key=lambda key:dic[key]))
          

          max([1,2,3,4,5,-6,-7],key=abs)
          

          

          ret = map(abs,[-1,2,-3,4])
          

          for i in ret:
          

              print(i)
          

          

          def func(x):
          

              return x**2
          

          ret = map(func,[-1,2,-3,4])
          

          for i in ret:
          

               print(i)
          

          

          ret = map(lambda x:x**2,[-1,2,-3,4])