Python 3.14+concurrent.interpretersexception

concurrent.interpreters.NotShareableError

exceptions

The object cannot be sent to another interpreter (Python 3.14+); a subclass of TypeError.

Syntax

raise concurrent.interpreters.NotShareableError

The trap is the inheritance: it is a TypeError subclass, so a broad except TypeError around your data passing will swallow it silently and send you hunting for a bug in the arguments. The shareable set is narrow — simple immutable values pass, lists, dicts and your own classes do not — so check is_shareable() up front, or hand the data over serialized, e.g. as a JSON string.

Examples

from concurrent import interpreters  # Python 3.14+
print(issubclass(interpreters.NotShareableError, TypeError))  # → True
print(interpreters.is_shareable(42))  # → True
print(interpreters.is_shareable([1, 2, 3]))  # → False
interp = interpreters.create()
try:
    interp.prepare_main(data=object())  # object() не переносится между интерпретаторами
except interpreters.NotShareableError as e:
    print(type(e).__name__)  # → NotShareableError
interp.prepare_main(n=42)  # число — переносится
interp.close()

See also

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