rustpython 0.1.1

A python interpreter written in rust.
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from testutils import assert_raises

assert format(5, "b") == "101"

assert_raises(TypeError, format, 2, 3, _msg='format called with number')

assert format({}) == "{}"

assert_raises(TypeError, format, {}, 'b', _msg='format_spec not empty for dict')

class BadFormat:
    def __format__(self, spec):
        return 42
assert_raises(TypeError, format, BadFormat())