bpo-40744: Drop support for SQLite pre 3.7.3 (GH-20909)

Remove code required to support SQLite pre 3.7.3.

Co-written-by: Berker Peksag <berker.peksag@gmail.com>
Co-written-by: Sergey Fedoseev <fedoseev.sergey@gmail.com>

Lib/sqlite3/test/backup.py

@@ -2,7 +2,6 @@ import sqlite3 as sqlite
 import unittest
 
 
-@unittest.skipIf(sqlite.sqlite_version_info < (3, 6, 11), "Backup API not supported")
 class BackupTests(unittest.TestCase):
     def setUp(self):
         cx = self.cx = sqlite.connect(":memory:")

Lib/sqlite3/test/dbapi.py

@@ -185,12 +185,6 @@ class ConnectionTests(unittest.TestCase):
             with self.assertRaises(sqlite.OperationalError):
                 cx.execute('insert into test(id) values(1)')
 
-    @unittest.skipIf(sqlite.sqlite_version_info >= (3, 3, 1),
-                     'needs sqlite versions older than 3.3.1')
-    def CheckSameThreadErrorOnOldVersion(self):
-        with self.assertRaises(sqlite.NotSupportedError) as cm:
-            sqlite.connect(':memory:', check_same_thread=False)
-        self.assertEqual(str(cm.exception), 'shared connections not available')
 
 class CursorTests(unittest.TestCase):
     def setUp(self):

Lib/sqlite3/test/hooks.py

@@ -61,8 +61,6 @@ class CollationTests(unittest.TestCase):
         self.assertEqual(result[0][0], 'b')
         self.assertEqual(result[1][0], 'a')
 
-    @unittest.skipIf(sqlite.sqlite_version_info < (3, 2, 1),
-                     'old SQLite versions crash on this test')
     def CheckCollationIsUsed(self):
         def mycoll(x, y):
             # reverse order
@@ -240,16 +238,12 @@ class TraceCallbackTests(unittest.TestCase):
             traced_statements.append(statement)
         con.set_trace_callback(trace)
         con.execute("create table foo(x)")
-        # Can't execute bound parameters as their values don't appear
-        # in traced statements before SQLite 3.6.21
-        # (cf. http://www.sqlite.org/draft/releaselog/3_6_21.html)
         con.execute('insert into foo(x) values ("%s")' % unicode_value)
         con.commit()
         self.assertTrue(any(unicode_value in stmt for stmt in traced_statements),
                         "Unicode data %s garbled in trace callback: %s"
                         % (ascii(unicode_value), ', '.join(map(ascii, traced_statements))))
 
-    @unittest.skipIf(sqlite.sqlite_version_info < (3, 3, 9), "sqlite3_prepare_v2 is not available")
     def CheckTraceCallbackContent(self):
         # set_trace_callback() shouldn't produce duplicate content (bpo-26187)
         traced_statements = []

Lib/sqlite3/test/regression.py

@@ -87,7 +87,6 @@ class RegressionTests(unittest.TestCase):
             cur.execute("select 1 x union select " + str(i))
         con.close()
 
-    @unittest.skipIf(sqlite.sqlite_version_info < (3, 2, 2), 'needs sqlite 3.2.2 or newer')
     def CheckOnConflictRollback(self):
         con = sqlite.connect(":memory:")
         con.execute("create table foo(x, unique(x) on conflict rollback)")

Lib/sqlite3/test/transactions.py

@@ -111,16 +111,12 @@ class TransactionTests(unittest.TestCase):
         res = self.cur2.fetchall()
         self.assertEqual(len(res), 1)
 
-    @unittest.skipIf(sqlite.sqlite_version_info < (3, 2, 2),
-                     'test hangs on sqlite versions older than 3.2.2')
     def CheckRaiseTimeout(self):
         self.cur1.execute("create table test(i)")
         self.cur1.execute("insert into test(i) values (5)")
         with self.assertRaises(sqlite.OperationalError):
             self.cur2.execute("insert into test(i) values (5)")
 
-    @unittest.skipIf(sqlite.sqlite_version_info < (3, 2, 2),
-                     'test hangs on sqlite versions older than 3.2.2')
     def CheckLocking(self):
         """
         This tests the improved concurrency with pysqlite 2.3.4. You needed

Lib/sqlite3/test/types.py

@@ -401,8 +401,6 @@ class DateTimeTests(unittest.TestCase):
         ts2 = self.cur.fetchone()[0]
         self.assertEqual(ts, ts2)
 
-    @unittest.skipIf(sqlite.sqlite_version_info < (3, 1),
-                     'the date functions are available on 3.1 or later')
     def CheckSqlTimestamp(self):
         now = datetime.datetime.utcnow()
         self.cur.execute("insert into test(ts) values (current_timestamp)")