Improve the import time of sqlite3 by 1.5x faster.

python · Wulian233 · Mar 27, 2025 · Jun 6, 2025 · Jun 6, 2025 · Jun 6, 2025
commit d3cf658dba37aafbeb5c1a7545186eb886a3abd8
@@ -7,10 +7,6 @@
 import sqlite3
 import sys
 
-from argparse import ArgumentParser
-from code import InteractiveConsole
-from textwrap import dedent
-
 
 def execute(c, sql, suppress_errors=True):
     """Helper that wraps execution of SQL code.
@@ -34,13 +30,15 @@ def execute(c, sql, suppress_errors=True):
             sys.exit(1)
 
 
-class SqliteInteractiveConsole(InteractiveConsole):
+class SqliteInteractiveConsole:
     """A simple SQLite REPL."""
 
     def __init__(self, connection):
-        super().__init__()
+        from code import InteractiveConsole
         self._con = connection
         self._cur = connection.cursor()
+        self._console = InteractiveConsole()
+        self._console.runsource = self.runsource
 
     def runsource(self, source, filename="<input>", symbol="single"):
         """Override runsource, the core of the InteractiveConsole REPL.
@@ -61,8 +59,14 @@ def runsource(self, source, filename="<input>", symbol="single"):
                 execute(self._cur, source)
         return False
 
+    def interact(self, banner, exitmsg=""):
+        self._console.interact(banner, exitmsg=exitmsg)
+
 
 def main(*args):
+    from argparse import ArgumentParser
+    from textwrap import dedent
+
     parser = ArgumentParser(
         description="Python sqlite3 CLI",
     )

@@ -20,9 +20,8 @@
 #    misrepresented as being the original software.
 # 3. This notice may not be removed or altered from any source distribution.
 
-import time
-import collections.abc
 import datetime
+import collections.abc
 
 from _sqlite3 import *
 
@@ -54,7 +53,10 @@ def TimestampFromTicks(ticks):
 Binary = memoryview
 collections.abc.Sequence.register(Row)
 
+# Lazy registe
 def register_adapters_and_converters():
+    global _lazy_register
+    _lazy_register = lambda: None  # Prevent multiple registration  # noqa: E731
     from warnings import warn
 
     msg = ("The default {what} is deprecated as of Python 3.12; "

diff --git a/Misc/NEWS.d/next/Library/2025-01-21-14-51-44.gh-issue-118761.Z0F-d5.rst b/Misc/NEWS.d/next/Library/2025-01-21-14-51-44.gh-issue-118761.Z0F-d5.rst
@@ -1 +1 @@
-Halve the import time of :mod:`sqlite3`.
+Improve the import time of :mod:`sqlite3` by 1.5x faster.
Original file line number	Diff line number	Diff line change
		@@ -1 +1 @@
		Halve the import time of :mod:`sqlite3`.
		Improve the import time of :mod:`sqlite3` by 1.5x faster.