rustpython 0.1.0

A python interpreter written in rust.
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from testutils import assert_raises

def no_args():
    pass

no_args()

assert_raises(TypeError, lambda: no_args('one_arg'), '1 arg to no_args')
assert_raises(TypeError, lambda: no_args(kw='should fail'), 'kwarg to no_args')


def one_arg(arg):
    return arg

one_arg('one_arg')
assert "arg" == one_arg(arg="arg")

assert_raises(TypeError, lambda: one_arg(), 'no args to one_arg')
assert_raises(TypeError,
              lambda: one_arg(wrong_arg='wont work'),
              'incorrect kwarg to one_arg')
assert_raises(TypeError,
              lambda: one_arg('one_arg', 'two_arg'),
              'two args to one_arg')
assert_raises(TypeError,
              lambda: one_arg('one_arg', extra_arg='wont work'),
              'no TypeError raised: extra kwarg to one_arg')

assert_raises(TypeError,
              lambda: one_arg('one_arg', arg='duplicate'),
              'same pos and kwarg to one_arg')


def one_default_arg(arg="default"):
    return arg

assert 'default' == one_default_arg()
assert 'arg' == one_default_arg('arg')
assert 'kwarg' == one_default_arg(arg='kwarg')

assert_raises(TypeError,
              lambda: one_default_arg('one_arg', 'two_arg'),
              'two args to one_default_arg')


def one_normal_one_default_arg(pos, arg="default"):
    return pos, arg

assert ('arg', 'default') == one_normal_one_default_arg('arg')
assert ('arg', 'arg2') == one_normal_one_default_arg('arg', 'arg2')

assert_raises(TypeError,
              lambda: one_normal_one_default_arg(),
              'no args to one_normal_one_default_arg')

assert_raises(TypeError,
              lambda: one_normal_one_default_arg('one', 'two', 'three'),
              'three args to one_normal_one_default_arg')


def two_pos(a, b):
    return (a, b)

assert ('a', 'b') == two_pos('a', 'b')
assert ('a', 'b') == two_pos(b='b', a='a')


def kwargs_are_variable(x=[]):
    x.append(1)
    return x

assert [1] == kwargs_are_variable()
assert [1, 1] == kwargs_are_variable()