How to update tree using bzrlib

[Nicholas Allen]

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> 
> I saw there is an update method on the Branch class. Is this the right
> method to call or is this only for bound branches. Will this fail if the
> branch doesn't have a tree?

It seems this method only updates from master location but does not
update the working tree. I notice there is a class called WorkingTree
and it has an update method. How do I obtain the WorkingTree object for
a branch though?

Nick
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