adds support for VACUUM

Author: dmalan

setup.py

@@ -18,5 +18,5 @@
     package_dir={"": "src"},
     packages=["cs50"],
     url="https://github.com/cs50/python-cs50",
-    version="9.3.4"
+    version="9.4.0"
 )

src/cs50/sql.py

@@ -177,6 +177,7 @@ def execute(self, sql, *args, **kwargs):
             "SELECT",
             "START",
             "UPDATE",
+            "VACUUM",
         }
 
         # Check if the full_statement starts with any command
@@ -378,7 +379,7 @@ def teardown_appcontext(exception):
                 )
 
                 # Check for start of transaction
-                if command in ["BEGIN", "START"]:
+                if command in ["BEGIN", "START", "VACUUM"]:  # cannot VACUUM from within a transaction
                     self._autocommit = False
 
                 # Execute statement
@@ -389,7 +390,7 @@ def teardown_appcontext(exception):
                     connection.execute(sqlalchemy.text("COMMIT"))
 
                 # Check for end of transaction
-                if command in ["COMMIT", "ROLLBACK"]:
+                if command in ["COMMIT", "ROLLBACK", "VACUUM"]:  # cannot VACUUM from within a transaction
                     self._autocommit = True
 
                 # Return value