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When subclassing a native type, calling native members in `__init__` before `super().__init__()` has been called could cause a crash. In this situation, `self` in `mp_convert_member_lookup` is the `native_base_init_wrapper_obj`. The check added in this commit ensures that an `AttributeError` is raised before this happens, which is consistent with other failed lookups. Also fix a typo in a related comment. Signed-off-by: Laurens Valk <laurens@pybricks.com>
38 lines
859 B
Python
38 lines
859 B
Python
# test subclassing custom native class
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try:
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from cexample import AdvancedTimer
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except ImportError:
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print("SKIP")
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raise SystemExit
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class SubTimer(AdvancedTimer):
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def __init__(self):
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# At this point, self does not yet represent a AdvancedTimer instance.
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print(self)
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# So lookups via type.attr handler will fail.
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try:
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self.seconds
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except AttributeError:
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print("AttributeError")
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# Also applies to builtin methods.
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try:
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self.time()
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except AttributeError:
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print("AttributeError")
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# Initialize base class.
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super().__init__(self)
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# Now you can access methods and attributes normally.
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self.time()
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print(self.seconds)
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self.seconds = 123
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print(self.seconds)
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watch = SubTimer()
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