def trycatch(*args, **kwargs):
    """Wraps a function in a try/catch block. Can be used as a function
    decorator or as a function that accepts another function.

    **Params**:
      - func (func) - Function to call. Only available when used as a function.
      - oncatch (str) [kwargs] - Function to call if an exception is caught.
      - rethrow (str) [kwargs] - If true, exception will be re-thrown.

    **Examples**:
    ::
        trycatch(myfunc)(myarg1, myarg2, kwarg=mykwarg)
        trycatch(myfunc, oncatch=mycatchfunc)(myarg1, myarg2, kwarg=mykwarg)
        trycatch(myfunc, rethrow=True)(myarg1, myarg2, kwarg=mykwarg)
    """
    rethrow = kwargs.get('rethrow', False)
    oncatch = kwargs.get('oncatch', None)
    def decor(func):
        def wrapper(*fargs, **fkrgs):
            try:
                return func(*fargs, **fkrgs)
            except:
                cresult = None
                if oncatch != None:
                    cresult = oncatch()
                if rethrow:
                    raise
                return cresult
        return wrapper
    if len(args) > 0 and callable(args[0]):
        func = args[0]
        return decor(func)
    return decor