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# `util` module

`whoosh.util.``fib`(n)

  Returns the nth value in the Fibonacci sequence.

`whoosh.util.``make_binary_tree`(fn, args, **kwargs)

  Takes a function/class that takes two positional arguments and a list of arguments and returns a binary tree of results/instances.

      >>> make_binary_tree(UnionMatcher, [matcher1, matcher2, matcher3])
      UnionMatcher(matcher1, UnionMatcher(matcher2, matcher3))

  Any keyword arguments given to this function are passed to the class initializer.

`whoosh.util.``make_weighted_tree`(fn, ls, **kwargs)

  Takes a function/class that takes two positional arguments and a list of (weight, argument) tuples and returns a huffman-like weighted tree of results/instances.

`whoosh.util.``synchronized`(func)

  Decorator for storage-access methods, which synchronizes on a threading lock. The parent object must have ‘is_closed’ and ‘_sync_lock’ attributes.

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