gh-118761: Improve import time of sqlite3

Lib/sqlite3/__main__.py

@@ -7,9 +7,7 @@
 import sqlite3
 import sys
 
-from argparse import ArgumentParser
 from code import InteractiveConsole
-from textwrap import dedent
 from _colorize import get_theme, theme_no_color
 
 
@@ -80,6 +78,9 @@ 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",
         color=True,

Lib/sqlite3/dbapi2.py

@@ -21,7 +21,6 @@
 # 3. This notice may not be removed or altered from any source distribution.
 
 import datetime
-import time
 import collections.abc
 
 from _sqlite3 import *
@@ -37,12 +36,15 @@
 Timestamp = datetime.datetime
 
 def DateFromTicks(ticks):
+    import time  # Lazy, to improve import time
     return Date(*time.localtime(ticks)[:3])
 
 def TimeFromTicks(ticks):
+    import time  # Lazy, to improve import time
     return Time(*time.localtime(ticks)[3:6])
 
 def TimestampFromTicks(ticks):
+    import time  # Lazy, to improve import time
     return Timestamp(*time.localtime(ticks)[:6])
 
 
@@ -52,6 +54,8 @@ def TimestampFromTicks(ticks):
 collections.abc.Sequence.register(Row)
 
 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; "

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

@@ -0,0 +1 @@
+Improve the import time of :mod:`sqlite3` by 1.5x faster.