def get(tree, name):
    """ Return a float value attribute NAME from TREE.
    """
    if name in tree:
        value = tree[name]
    else:
        return float("nan")
    try:
        a = float(value)
    except ValueError:
        a = float("nan")
    return a
def get ( tree , name ) : if name in tree : value = tree [ name ] else : return float ( "nan" ) try : a = float ( value ) except ValueError : a = float ( "nan" ) return a
Return a float value attribute NAME from TREE.