PyCQA / astroid / 563

91%

main: 92%

Pull #410

travis-ci

Quickstart _infer_binary_operation to raise errors that occur during startup.

Since https://github.com/PyCQA/astroid/commit/3e2721391,
is_subtype and is_supertype raise exceptions when they can't find a
relationship between types. This is caught by the callers of
_infer_binary_operation. However, the error is only thrown after the
generator return by _infer_binary_operation is started.

Prior to this patch, the generator is only started inside the else
clause of:

try:
    results = _infer_binary_operation(lhs, rhs, self, context, _get_binop_flow)
except exceptions._NonDeducibleTypeHierarchy:
    yield util.Uninferable
else:
    for result in results:
        yield result

To address this, the quickstart decorator pulls the first value from the
generator when it's called, and then buffers that first result until it is
needed by the later iteration.

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