iPython
In [1]: staff = {1: 'test1', 2: 'test0', 3: 'test3'}
In [2]: staff2 = {4: 'test4', 1: 'test0'}
In [3]: staff.update(staff2)
In [4]: staff
Out[4]: {1: 'test0', 2: 'test0', 3: 'test3', 4: 'test4'}
Portfolio
iPython
In [1]: staff = {1: 'test1', 2: 'test0', 3: 'test3'}
In [2]: staff2 = {4: 'test4', 1: 'test0'}
In [3]: staff.update(staff2)
In [4]: staff
Out[4]: {1: 'test0', 2: 'test0', 3: 'test3', 4: 'test4'}