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add type for pool.acquire() #521

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add type for pool.acquire() #521

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Tynukua
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@Tynukua Tynukua commented Jan 8, 2020

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@eirnym
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eirnym commented Jan 10, 2020

Looks good for me.

@@ -566,7 +566,7 @@ async def fetchrow(self, query, *args, timeout=None):
async with self.acquire() as con:
return await con.fetchrow(query, *args, timeout=timeout)

def acquire(self, *, timeout=None):
def acquire(self, *, timeout=None) -> connection.Connection:
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This type hint only covers usual await case:

con = await pool.acquire()

But won't work properly for context manager case:

async with pool.acquire() as con:
    await con.execute(...)

The more correct return type could be something like PoolAcquireContext but we should check if mypy understands it first.

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#577 contains more precise types

@DanielNoord
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It is clear that this is incorrect and should be PoolAcquireContext.

I'd suggest either changing that in this PR or just closing this and wait until a PR that targets more of these simple methods is created.

@DanielNoord
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This is superseded by #1209

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4 participants