Best way to check if a directory is an brz branch

[Nicholas Allen]

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> 
> You canb try to open it, and catch the NotBranchError.
> 
> from bzrlib.errors import NotBranchError
> from bzrlib.branch import Branch
> try:
>     b = Branch.open(dir)
>     # do something if it is a branch...
> except NotBranchError:
>     # do something else or pass if not a branch
> 

It would be nice to have that contained inside a method is_branch that
did this for you. That way you can use it in expressions and if statements.

I think the BzrLib should have such a function.

Cheers,

Nick
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