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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 get_el(el):
 """ Get value of given `el` tag element. Automatically choose proper method to set the `value` based on the type of the `el`. Args: el (obj):
 Element reference to the input you want to convert to typeahead. Returns: str: Value of the object. """

        tag_name = el.elt.tagName.lower()
        if tag_name in {"input", "textarea", "select"}:
            return el.value
        else:
            raise ValueError(
                "Getter for %s (%s) not implemented!" % (tag_name, el.id)
            )