catching IntegrityError now and returning None

Author: dmalan

Makefile

@@ -2,7 +2,7 @@ BUILD_DIR = build
 DESCRIPTION = CS50 Library for Python
 MAINTAINER = CS50 <sysadmins@cs50.harvard.edu>
 NAME = lib50-python
-VERSION = 1.2.3
+VERSION = 1.2.4
 
 .PHONY: bash
 bash:

src/sql.py

@@ -34,6 +34,9 @@ def execute(self, text, *multiparams, **params):
             else:
                 return result.rowcount
 
+        except sqlalchemy.exc.IntegrityError:
+            return None
+
         except Exception as e:
             raise RuntimeError(e)