Rename exceptions.py to avoid shadowing built-in module

solvable/src/webservice/server.py

@@ -4,7 +4,7 @@ from flask import Flask, render_template, request, session, url_for
 
 from model import init_db
 from user_ops import UserOps
-from exceptions import InvalidCredentialsError, UserExistsError
+from errors import InvalidCredentialsError, UserExistsError
 
 BASEURL = getenv('BASEURL', '')
 init_db()

solvable/src/webservice/user_ops.py

@@ -1,6 +1,6 @@
 from crypto import PasswordHasher
 from model import Session, User
-from exceptions import InvalidCredentialsError, UserExistsError
+from errors import InvalidCredentialsError, UserExistsError
 
 
 class UserOps: