From 8f873937bdee0d3008286e87a264224f50e6ef84 Mon Sep 17 00:00:00 2001
From: Daniele Varrazzo <daniele.varrazzo@gmail.com>
Date: Sun, 20 Mar 2022 01:44:07 +0100
Subject: [PATCH] perf: use `b"'"[0]` as const value to represent `ord("'")`

The value is expanded at compile time::

    >>> dis.dis('b"\'"[0]')
      1           0 LOAD_CONST               0 (39)
                  2 RETURN_VALUE
---
 psycopg/psycopg/sql.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/psycopg/psycopg/sql.py b/psycopg/psycopg/sql.py
index eb5be8aef..4e0d0d3de 100644
--- a/psycopg/psycopg/sql.py
+++ b/psycopg/psycopg/sql.py
@@ -395,7 +395,7 @@ class Literal(Composable):
         rv = dumper.quote(self._obj)
         # If the result is quoted and the oid not unknown,
         # add an explicit type cast.
-        if rv[-1] == 39 and dumper.oid:
+        if rv[-1] == b"'"[0] and dumper.oid:
             ti = tx.adapters.types.get(dumper.oid)
             if ti:
                 # TODO: ugly encoding just to be decoded by as_string()
-- 
2.47.3