bpo-44859: Improve error handling in sqlite3 and and raise more accurate exceptions. (GH-27654)

* MemoryError is now raised instead of sqlite3.Warning when
  memory is not enough for encoding a statement to UTF-8
  in Connection.__call__() and Cursor.execute().
* UnicodEncodeError is now raised instead of sqlite3.Warning when
  the statement contains surrogate characters
  in Connection.__call__() and Cursor.execute().
* TypeError is now raised instead of ValueError for non-string
  script argument in Cursor.executescript().
* ValueError is now raised for script containing the null
  character instead of truncating it in Cursor.executescript().
* Correctly handle exceptions raised when getting boolean value
  of the result of the progress handler.
* Add many tests covering different corner cases.

Co-authored-by: Erlend Egeberg Aasland <erlend.aasland@innova.no>

Lib/sqlite3/test/hooks.py

@@ -24,7 +24,7 @@ import unittest
 import sqlite3 as sqlite
 
 from test.support.os_helper import TESTFN, unlink
-
+from .userfunctions import with_tracebacks
 
 class CollationTests(unittest.TestCase):
     def test_create_collation_not_string(self):
@@ -145,7 +145,6 @@ class ProgressTests(unittest.TestCase):
             """)
         self.assertTrue(progress_calls)
 
-
     def test_opcode_count(self):
         """
         Test that the opcode argument is respected.
@@ -198,6 +197,32 @@ class ProgressTests(unittest.TestCase):
         con.execute("select 1 union select 2 union select 3").fetchall()
         self.assertEqual(action, 0, "progress handler was not cleared")
 
+    @with_tracebacks(['bad_progress', 'ZeroDivisionError'])
+    def test_error_in_progress_handler(self):
+        con = sqlite.connect(":memory:")
+        def bad_progress():
+            1 / 0
+        con.set_progress_handler(bad_progress, 1)
+        with self.assertRaises(sqlite.OperationalError):
+            con.execute("""
+                create table foo(a, b)
+                """)
+
+    @with_tracebacks(['__bool__', 'ZeroDivisionError'])
+    def test_error_in_progress_handler_result(self):
+        con = sqlite.connect(":memory:")
+        class BadBool:
+            def __bool__(self):
+                1 / 0
+        def bad_progress():
+            return BadBool()
+        con.set_progress_handler(bad_progress, 1)
+        with self.assertRaises(sqlite.OperationalError):
+            con.execute("""
+                create table foo(a, b)
+                """)
+
+
 class TraceCallbackTests(unittest.TestCase):
     def test_trace_callback_used(self):
         """