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Python 3.10 is now generally available.

google.appengine.api.apiproxy_stub.Synchronized

Decorator to acquire a mutex around an APIProxyStub method.

google.appengine.api.apiproxy_stub.Synchronized(
    method
)

method An unbound method of APIProxyStub or a subclass.

The method, altered such it acquires self._mutex throughout its execution.