Python JEXL.add_unary_operator Examples

Example #1

def test_grammar_invalidation():
    """
    Ensure that the grammar object doesn't get stale when operators
    change.
    """
    jexl = JEXL()
    jexl.add_unary_operator('=', lambda x: x + 5)
    assert jexl.evaluate('=5') == 10

    jexl.remove_unary_operator('=')
    with pytest.raises(ParseError):
        jexl.evaluate('=5')

Example #2

def test_add_custom_unary_operator():
    jexl = JEXL()
    jexl.add_unary_operator('=', lambda x: x + 5)
    assert jexl.evaluate('=5') == 10