Calling filter returns filter object at

Question

I am learning the concept of filters in Python  I am running a simple code like this    gt  gt  gt  def f x   return x   2    0 and x   3    0  gt  gt  gt  filter f  range 2  25     But instead of getting a list  I am getting some message like this    lt filter object at 0x00FDC550 gt    What does this mean  Does it means that my filtered object i e list to come out is stored at that memory location  How do I get the list which I need

User · Answer

It s an iterator returned by the filter function   If you want a list  just do  list filter f  range 2  25      Nonetheless  you can just iterate over this object with a for loop   for e in filter f  range 2  25        do stuff e

User · Answer

It looks like you re using python 3 x   In python3  filter  map  zip  etc return an object which is iterable  but not a list   In other words   filter func data   python 2 x   is equivalent to   list filter func data    python 3 x   I think it was changed because you  often  want to do the filtering in a lazy sense -- You don t need to consume all of the memory to create a list up front  as long as the iterator returns the same thing a list would during iteration     If you re familiar with list comprehensions and generator expressions  the above filter is now  almost  equivalent to the following in python3 x     x for x in data if func x       As opposed to     x for x in data if func x      in python 2 x

[python] Calling filter returns <filter object at ... >

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