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ObservableÚcompose)Ú operators)Ú PredicateÚ_TN)Ú predicateÚreturnc C s> | rt t | ¡t ¡ ƒS tttt gtt f t d¡ƒS dS )a? Returns the only element of an observable sequence that satisfies the
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Example:
>>> res = single()
>>> res = single(lambda x: x == 42)
Args:
predicate -- [Optional] A predicate function to evaluate for
elements in the source sequence.
Returns:
An observable sequence containing the single element in the
observable sequence that satisfies the condition in the predicate.
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