Github user davebshow commented on the issue:
https://github.com/apache/tinkerpop/pull/478
As long as the driver returns a future with a compatible API, yes, it can
be used with all Python versions. The snippet you provided will throw an error
with an Asyncio or Tornado client, as you can only call
[`result()`](https://docs.python.org/3/library/asyncio-task.html#asyncio.Future.result)
on a completed future. You will typically need to `yield/yield from/await` it
first depending on the Python version and driver (like in the examples provided
above). However, the underlying coroutine will spawn independently, which means
that even if you don't `yield/yield from/await`, but you wait long enough
before calling `result()` it will complete. For example:
```python
future = g.V().promise(lambda t: t.toList())
assert not future.done() # Future has not completed
await asyncio.sleep(5) # Simulate doing a ton of other blocking stuff
assert future.done() # Future has completed (assuming 5 seconds was enough
time to complete)
result = future.result() # Doesn't throw an error
```
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