Improve import time of sqlite3

Author: Wulian233

Lib/sqlite3/__init__.py

@@ -1,8 +1,8 @@
-# pysqlite2/__init__.py: the pysqlite2 package.
+# sqlite3/__init__.py: the sqlite3 package.
 #
 # Copyright (C) 2005 Gerhard Häring <[email protected]>
 #
-# This file is part of pysqlite.
+# This file is part of sqlite3.
 #
 # This software is provided 'as-is', without any express or implied
 # warranty.  In no event will the authors be held liable for any damages
@@ -22,7 +22,7 @@
 
 """
 The sqlite3 extension module provides a DB-API 2.0 (PEP 249) compliant
-interface to the SQLite library, and requires SQLite 3.7.15 or newer.
+interface to the SQLite library, and requires SQLite 3.15.2 or newer.
 
 To use the module, start by creating a database Connection object:
 

Lib/sqlite3/__main__.py

@@ -6,10 +6,7 @@
 """
 import sqlite3
 import sys
-
-from argparse import ArgumentParser
 from code import InteractiveConsole
-from textwrap import dedent
 
 
 def execute(c, sql, suppress_errors=True):
@@ -63,6 +60,9 @@ def runsource(self, source, filename="<input>", symbol="single"):
 
 
 def main(*args):
+    from argparse import ArgumentParser
+    from textwrap import dedent
+
     parser = ArgumentParser(
         description="Python sqlite3 CLI",
     )

Lib/sqlite3/dbapi2.py

@@ -1,4 +1,4 @@
-# pysqlite2/dbapi2.py: the DB-API 2.0 interface
+# sqlite3/dbapi2.py: the DB-API 2.0 interface
 #
 # Copyright (C) 2004-2005 Gerhard Häring <[email protected]>
 #
@@ -20,11 +20,10 @@
 #    misrepresented as being the original software.
 # 3. This notice may not be removed or altered from any source distribution.
 
-import datetime
-import time
 import collections.abc
+import datetime
 
-from _sqlite3 import *
+from _sqlite3 import Row, sqlite_version
 
 paramstyle = "qmark"
 
@@ -37,12 +36,15 @@
 Timestamp = datetime.datetime
 
 def DateFromTicks(ticks):
+    import time
     return Date(*time.localtime(ticks)[:3])
 
 def TimeFromTicks(ticks):
+    import time
     return Time(*time.localtime(ticks)[3:6])
 
 def TimestampFromTicks(ticks):
+    import time
     return Timestamp(*time.localtime(ticks)[:6])
 
 
@@ -52,6 +54,7 @@ def TimestampFromTicks(ticks):
 collections.abc.Sequence.register(Row)
 
 def register_adapters_and_converters():
+    from _sqlite3 import register_adapter, register_converter
     from warnings import warn
 
     msg = ("The default {what} is deprecated as of Python 3.12; "

Misc/NEWS.d/next/Library/2025-01-21-14-51-44.gh-issue-118761.Z0F-d5.rst

@@ -0,0 +1 @@
+Improve import time of :mod:`sqlite3` by around 2 times. Patch by Jiahao Li.