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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def typedef_callable_handle(tokens):
 """Process -> to Callable inside type annotations."""

    if len(tokens) == 1:
        return '_coconut.typing.Callable[..., ' + tokens[0] + ']'
    elif len(tokens) == 2:
        return '_coconut.typing.Callable[[' + tokens[0] + '], ' + tokens[1] + ']'
    else:
        raise CoconutInternalException("invalid Callable typedef tokens", tokens)