Added comments

Author: dmalan

src/cs50/sql.py

@@ -215,13 +215,15 @@ def execute(self, sql, *args, **kwargs):
         # Join tokens into statement
         statement = "".join([str(token) for token in tokens])
 
+        # Catch SQLAlchemy warnings
         with warnings.catch_warnings():
+            
+            # Raise exceptions for warnings
             warnings.simplefilter("error")
 
             # Prepare, execute statement
             try:
 
-
                 # Execute statement
                 result = self.engine.execute(sqlalchemy.text(statement))