iPython
In [1]: staff = {1: 'test1', 2: 'test0', 3: 'test3'}
In [2]: staff
Out[2]: {1: 'test1', 2: 'test0', 3: 'test3'}
In [3]: staff[2] = 'test2'
In [4]: staff
Out[4]: {1: 'test1', 2: 'test2', 3: 'test3'}
Python
iPython
In [1]: staff = {1: 'test1', 2: 'test0', 3: 'test3'}
In [2]: staff
Out[2]: {1: 'test1', 2: 'test0', 3: 'test3'}
In [3]: staff[2] = 'test2'
In [4]: staff
Out[4]: {1: 'test1', 2: 'test2', 3: 'test3'}