[Tutor] why use *get*

[Luiz Siqueira Neto]

I don't know why use *get*.

ex.
d = {'name':'foo'}

### all this instructions have the same result
d['name'] = d.get('name', 0) + 'bar'
d['name'] = d.get('name', 1) + 'bar'
d['name'] = d.get('name', 2) + 'bar'
d['name'] = d.get('name', 3) + 'bar'
d['name'] = += 'bar'

For what I use *x.get* ????