The identity of variables/objects

To check whether 2 variables or objects are identical you can use id() or is.

 
In [1]: a = object()

In [2]: b = a

In [3]: id(a)
Out[3]: 139859518217472

In [4]: id(b)
Out[4]: 139859518217472

In [5]: b is a
Out[5]: True