“add to set” returns a boolean in java - what about python?

Question

In Java I like to use the Boolean value returned by an \"add to the set\" operation to test whether the element was already present in the set:

if (set.add(\         


        

Answer 1

I guess, in Python is basically add y to your set if needed and doesn't return anything. You can test if y is already in z if you would like to know if the add will change anything.

Here some tests you can do in iPython :

In [2]: z = set()

In [3]: y = 4

In [4]: z.add(y)

In [5]: t = z.add(y)

In [6]: t

In [7]: print t
None