Function _required_child

lab/cust-elm-classes/main.py:92–97

Add child element with *tag* to *parent* if it doesn't already exist.

(parent, tag)

        element.set(name, default)

def _required_child(parent, tag):
    """
    Add child element with *tag* to *parent* if it doesn't already exist.
    """
    if _child(parent, tag) is None:
        parent.append(_Element(tag))


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